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Journal articles on the topic 'Critical period of weed control'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Singh, M., M. C. Saxena, B. E. Abu-Irmaileh, S. A. Al-Thahabi, and N. I. Haddad. "Estimation of Critical Period of Weed Control." Weed Science 44, no. 2 (1996): 273–83. http://dx.doi.org/10.1017/s0043174500093899.

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An estimation of the critical period of weed control is helpful in formulating appropriate weed-control strategies. A regression approach is presented to estimate the thresholds of critical period of weed control and time of equal interference (or time of onset of competition). In this approach, yields were either a linear or logistic function of the duration of weed-free and weed-infested periods. Confidence intervals of the thresholds of critical period and time of equal interference were determined for the linear model. An approximation to the standard error of critical period and associate

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2

Fedoruk, L. K., E. N. Johnson, and S. J. Shirtliffe. "The Critical Period of Weed Control for Lentil in Western Canada." Weed Science 59, no. 4 (2011): 517–26. http://dx.doi.org/10.1614/ws-d-11-00051.1.

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Weed control in lentil is difficult because lentil is a poor competitor with weeds and few POST broadleaf herbicides are available. Imadazolinone-tolerant lentils have more herbicide options, but the optimum timing for herbicide application is not known. The critical period of weed control (CPWC) is the period in a crop's life cycle when weeds must be controlled in order to prevent yield loss. The objective of this research was to determine the CPWC for lentil. We made lentil remain weedy or weed-free from 0 to 11 aboveground nodes to investigate the durations of weed interference and weed-fre

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3

Dillehay, Bryan L., William S. Curran, and David A. Mortensen. "Critical Period for Weed Control in Alfalfa." Weed Science 59, no. 1 (2011): 68–75. http://dx.doi.org/10.1614/ws-d-10-00073.1.

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The critical period for weed control for many crops has been well investigated and the results have been used to develop better weed management recommendations. However, research is limited on the critical period for weed control for alfalfa, a perennial crop with multiple harvests. With the advent of new, more effective POST herbicides for alfalfa, an understanding of the critical period may further enhance forage yield. The objective of this study was to determine the critical period for weed control in spring-seeded alfalfa. Alfalfa was seeded conventionally at two locations in Pennsylvania

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4

Miller, Alan B., and Herbert J. Hopen. "Critical Weed-Control Period in Seeded Cabbage (Brassica oleraceavarcapitata)." Weed Technology 5, no. 4 (1991): 852–57. http://dx.doi.org/10.1017/s0890037x00033972.

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The critical weed-control period in field seeded cabbage using natural weed stands was 2 wk in 1988 and 4 wk in 1989. Regression analysis showed that the length of weed-free period, weed density, and ambient light reduction by competing weeds were factors affecting cabbage yield. Weeds that emerged after the initial weed-free period shaded the soil and subsequently lowered soil surface temperatures in 1989. Velvetleaf densities of 1.2 and 3.6 plants per m2that competed all season with cabbage reduced cabbage yields 52% and 71% of the weed-free treatment in 1988 and 76% and 92% in 1989, respect

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5

Knezevic, Stevan Z., and Avishek Datta. "The Critical Period for Weed Control: Revisiting Data Analysis." Weed Science 63, SP1 (2015): 188–202. http://dx.doi.org/10.1614/ws-d-14-00035.1.

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There is an ever-larger need for designing an integrated weed management (IWM) program largely because of the increase in glyphosate-resistant weeds, not only in the United States but also worldwide. An IWM program involves a combination of various methods (cultural, mechanical, biological, genetic, and chemical) for effective and economical weed control (Swanton and Weise 1991). One of the first steps in designing an IWM program is to identify thecritical period for weed control(CPWC), defined as a period in the crop growth cycle during which weeds must be controlled to prevent crop yield los

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6

Anwar, M. P., A. S. Juraimi, B. Samedani, A. Puteh, and A. Man. "Critical Period of Weed Control in Aerobic Rice." Scientific World Journal 2012 (2012): 1–10. http://dx.doi.org/10.1100/2012/603043.

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Critical period of weed control is the foundation of integrated weed management and, hence, can be considered the first step to design weed control strategy. To determine critical period of weed control of aerobic rice, field trials were conducted during 2010/2011 at Universiti Putra Malaysia. A quantitative series of treatments comprising two components, (a) increasing duration of weed interference and (b) increasing length of weed-free period, were imposed. Critical period was determined through Logistic and Gompertz equations. Critical period varied between seasons; in main season, it start

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7

Gantoli, Geoffroy, Victor Rueda Ayala, and Roland Gerhards. "Determination of the Critical Period for Weed Control in Corn." Weed Technology 27, no. 1 (2013): 63–71. http://dx.doi.org/10.1614/wt-d-12-00059.1.

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Field experiments were conducted in western Atakora, Benin, to determine the critical time period of weed competition in hand-weeded corn. Weeds were removed until different crop growth stages and then allowed to reemerge. Other treatments began weed control at different growth stages (four-, eight-, and ten-leaf stages and flowering) and were maintained until harvest. One treatment was permanently kept weed-free and one treatment was uncontrolled until harvest. Yields without weed competition ranged from 2.8 to 3.4 t ha−1. As expected, yield loss increased with duration of weed infestation an

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8

Tursun, Nihat, Bekir Bükün, Sinan Can Karacan, Mathieu Ngouajio, and Hüsrev Mennan. "Critical Period for Weed Control in Leek (Allium porrum L.)." HortScience 42, no. 1 (2007): 106–9. http://dx.doi.org/10.21273/hortsci.42.1.106.

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Field studies were conducted in Mersin, Turkey, in 2002 and 2003 to determine the critical period for weed control in leek and to investigate the effects of weed interference on weed biomass. The critical period for weed control in leek based on a 5% acceptable yield loss level was calculated by fitting logistic and Gompertz equations to relative yield data. Total fresh biomass of weeds increased as the duration of weed infestation increased. The beginning of the critical period for weed control was 7 days after transplanting in 2002 and 13 days after transplanting in 2003. The end of the crit

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9

Burnside, Orvin C., Melvin J. Wiens, Bobby J. Holder, et al. "Critical periods for weed control in dry beans (Phaseolus vulgaris)." Weed Science 46, no. 3 (1998): 301–6. http://dx.doi.org/10.1017/s0043174500089451.

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Weed removal experiments in dry edible beans were conducted during 1992 and 1993 at Crookston and Staples, MN. Ten manual weed removal treatments were studied to determine when a natural infestation of weeds first reduced dry bean yield, and when weed removal could be discontinued without further loss of seed yield. Major weeds in order of average biomass production on weedy check plots at dry bean harvest over locations and years were wild mustard, foxtail spp., redroot pigweed, common ragweed, wild buckwheat, hairy nightshade, and common lambsquarters. Hairy nightshade also emerged late in t

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10

Bertucci, Matthew B., Katherine M. Jennings, David W. Monks, et al. "Critical Period for Weed Control in Grafted and Nongrafted Watermelon Grown in Plasticulture." Weed Science 67, no. 2 (2018): 221–28. http://dx.doi.org/10.1017/wsc.2018.76.

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AbstractField experiments determined the critical period for weed control (CPWC) in grafted and nongrafted watermelon [Citrullus lanatus(Thumb.) Matsum. & Nakai] grown in plasticulture. Transplant types included ‘Exclamation’ seedless watermelon as the nongrafted control as well as Exclamation grafted onto two interspecific hybrid squash (ISH) rootstocks, ‘Carnivor’ and ‘Kazako’. To simulate weed emergence throughout the season, establishment treatments (EST) consisted of two seedlings each of common purslane (Portulaca oleraceaL.), large crabgrass [Digitaria sanguinalis(L.) Scop.], and ye

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11

Martin, Steven G., Rene C. Van Acker, and Lyle F. Friesen. "Critical period of weed control in spring canola." Weed Science 49, no. 3 (2001): 326–33. http://dx.doi.org/10.1614/0043-1745(2001)049[0326:cpowci]2.0.co;2.

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12

Karnas, Zeynep, Doğan Isik, Nihat Tursun, and Khawar Jabran. "Critical period for weed control in sesame production." Weed Biology and Management 19, no. 4 (2019): 121–28. http://dx.doi.org/10.1111/wbm.12188.

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13

Bedmar, Francisco, Pablo Manetti, and Gloria Monterubbianesi. "Determination of the critical period of weed control in corn using a thermal basis." Pesquisa Agropecuária Brasileira 34, no. 2 (1999): 188–93. http://dx.doi.org/10.1590/s0100-204x1999000200006.

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Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed rem

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14

Williams, Martin M. "Planting date influences critical period of weed control in sweet corn." Weed Science 54, no. 5 (2006): 928–33. http://dx.doi.org/10.1614/ws-06-005r.1.

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The critical period for weed control (CPWC) identifies the phase of the crop growth cycle when weed interference results in unacceptable yield losses; however, the effect of planting date on CPWC is not well understood. Field studies were conducted in 2004 and 2005 at Urbana, IL, to determine CPWC in sweet corn for early May (EARLY) and late-June (LATE) planting dates. A quantitative series of treatments of both increasing duration of interference and length of weed-free period were imposed within each planting-date main plot. The beginning and end of the CPWC, based on 5% loss of marketable e

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15

Woolley, Brian L., Thomas E. Michaels, Michael R. Hall, and Clarence J. Swanton. "The Critical Period of Weed Control in White Bean (Phaseolus vulgaris)." Weed Science 41, no. 2 (1993): 180–84. http://dx.doi.org/10.1017/s0043174500076037.

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Field studies were conducted in 1986 and 1987 to determine the critical period for weed control in white bean grown in Ontario. The treatments consisted of either allowing weeds to infest the crop for increasing durations after planting or maintaining plots weed free for increasing durations after planting. The beginning of the critical period was defined as the crop stage by which weed interference reduced yields by 3%. Similarly, the end of the critical period was defined as the crop stage to which the crop had to be weed free to prevent a 3% yield loss. The critical period of weed control o

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16

Green-Tracewicz, Emily, Eric R. Page, and Clarence J. Swanton. "Light Quality and the Critical Period for Weed Control in Soybean." Weed Science 60, no. 1 (2012): 86–91. http://dx.doi.org/10.1614/ws-d-11-00072.1.

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The critical period for weed control (CPWC) is an integral component of integrated weed management strategies. Several studies have defined the CPWC in soybean under varying agronomic conditions, yet none have described the mechanisms involved in crop yield losses caused by weed competition. We hypothesized that under nonresource-limiting conditions, morphological changes resulting from the expression of shade avoidance could be used to define a period of developmental sensitivity to low red-to-far-red ratio (R : FR) that would overlap with the defined CPWC in soybean. Two experiments (a seque

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17

GUZZO, CAIO D., LEONARDO B. DE CARVALHO, PAULO R. F. GIANCOTTI, PEDRO L. C. A. ALVES, ELAINE C. P. GONÇALVES, and JOSÉ V. F. MARTINS. "Impact of the timing and duration of weed control on the establishment of a rubber tree plantation." Anais da Academia Brasileira de Ciências 86, no. 1 (2014): 495–504. http://dx.doi.org/10.1590/0001-37652014119113.

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Rubber tree production is reduced by weeds that compete for environmental resources; therefore, the timing and duration of weed control influences weed interference. The objectives of this study were to evaluate the growth of rubber tree (Hevea brasiliensis) plants, to determine the critical period for weed control, and to evaluate the growth recovery of rubber trees that coexisted with weeds for different periods of time after planting. Two groups of treatments were established under field conditions in the first year of the investigation: one group contained crescent periods of weed infestat

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18

Amador-Ramirez, M. D. "Critical period of weed control in transplanted chilli pepper." Weed Research 42, no. 3 (2002): 203–9. http://dx.doi.org/10.1046/j.0043-1737.2002.00278.x.

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19

ISIK, Dogan, Adem AKCA, Emine KAYA ALTOP, Nihat TURSUN, and Husrev MENNAN. "The Critical Period for Weed Control (CPWC) in Potato (Solanum tuberosum L.)." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 43, no. 2 (2015): 355–60. http://dx.doi.org/10.15835/nbha43210031.

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Accurate assessment of crop-weed control period is an essential part for planning an effective weed management for cropping systems. Field experiments were conducted during the seasonal growing periods of potato in 2012 and 2013 in Kayseri, Turkey to assess critical period for weed control (CPWC) in potato. A four parameter log-logistic model was used to assist in monitoring and analysing two sets of related, relative crop yield. Data was obtained during the periods of increased weed interference and as a comparison, during weed-free periods. In both years, the relative yield of potato decreas

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20

Adachi, Y., M. Ichihara, M. Yamashita, H. Sawada, Y. Kida, and M. Asai. "Critical period of weed control in soybean in Chuen, Shizuoka." Journal of Weed Science and Technology 50, Supplement (2005): 60–61. http://dx.doi.org/10.3719/weed.50.supplement_60.

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21

Webster, Theodore M., Wilson H. Faircloth, J. Timothy Flanders, Eric P. Prostko, and Timothy L. Grey. "The Critical Period of Bengal Dayflower (Commelina Bengalensis) Control in Peanut." Weed Science 55, no. 4 (2007): 359–64. http://dx.doi.org/10.1614/ws-06-181.1.

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Bengal dayflower (also known as tropical spiderwort) is one of the most troublesome weeds in peanut in Georgia, United States. Field studies conducted in 2004 and 2005 evaluated the relationship between the duration of Bengal dayflower interference and peanut yield in an effort to optimize the timing of weed control. In 2004, the critical period of weed control (CPWC) necessary to avoid greater than 5% peanut yield loss was between 316 and 607 growing degree days (GDD), which corresponded to an interval between June 8 and July 2. In 2005, the CPWC ranged from 185 to 547 GDD, an interval betwee

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22

Isik, Dogan, Husrev Mennan, Bekir Bukun, Ahmet Oz, and Mathieu Ngouajio. "The Critical Period for Weed Control in Corn in Turkey." Weed Technology 20, no. 4 (2006): 867–72. http://dx.doi.org/10.1614/wt-05-102.1.

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Field studies were conducted in 2001 and 2002 in the Black Sea Region of northern Turkey to determine the critical period for weed control (CPWC) in corn and the effects of weed interference on corn height. Treatments of increasing duration of weed interference and weed-free period were imposed at weekly intervals from 0 to 12 wk after crop emergence (WAE). The CPWC was determined with the use of 2.5, 5, and 10% acceptable yield loss levels by fitting logistic and Gompertz equations to relative yield data. With 5% yield loss level, the CPWC was 5 wk, starting at 0.2 WAE and ending at 5.2 WAE,

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23

Madandoust, Mehdi, and Ahmad Ranjbar. "Effects of solarization on critical period of weed control in sesame (Sesamum indicum L.)." Outlook on Agriculture 46, no. 4 (2017): 272–78. http://dx.doi.org/10.1177/0030727017744936.

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In order to determine the critical period of weed control in sesame, field studies were conducted during the 2014 and 2015 growing seasons in Estahban, Iran. The experiments were conducted based on factorial arrangement which involved a randomized complete block design with three replications. The first factor was conducted in two weed-infested and weed-free series until different phonological stages of sesame growth. These stages included a third pair true leaf initiation, first bud emergence, 50% opened flowers, and minor plants stop flowering, and the second factor was related to solarizati

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24

Swanton, Clarence J., Kevin Chandler, and Anil Shrestha. "Weed seed return as influenced by the critical weed-free period in corn (Zea mays L.)." Canadian Journal of Plant Science 79, no. 1 (1999): 165–67. http://dx.doi.org/10.4141/p98-044.

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Seed return from later emerging weeds is a concern in weed management systems based on critical periods of control. A study in Ontario found that estimated weed seed return to the soil surface was influenced by the duration of weed control in corn and the prevailing environmental conditions. Weeds emerging after the 8- to 11-leaf stage of corn growth did not cause an increase in total seed number compared to the residual seed bank in the weed-free control. Key words: Seedbank, weed population dynamics, integrated weed management

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25

Hall, Michael R., Clarence J. Swanton, and Glenn W. Anderson. "The Critical Period of Weed Control in Grain Corn (Zea mays)." Weed Science 40, no. 3 (1992): 441–47. http://dx.doi.org/10.1017/s0043174500051882.

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Field studies were conducted in southern Ontario to determine the critical period of weed control in grain corn and the influence of weed interference on corn leaf area. The Gompertz and logistic equations were fitted to data representing increasing durations of weed control and weed interference, respectively. The beginning of the critical period varied from the 3- to 14-leaf stages of corn development However, the end of the critical period was less variable and ended on average at the 14-leaf stage. Weed interference reduced corn leaf area by reducing the expanded leaf area of each individu

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26

Van Acker, Rene C., Clarence J. Swanton, and Stephan F. Weise. "The Critical Period of Weed Control in Soybean [Glycine max(L.) Merr.]." Weed Science 41, no. 2 (1993): 194–200. http://dx.doi.org/10.1017/s0043174500076050.

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Field studies were conducted at three locations over 2 yr in southern Ontario to determine the critical period of weed control in soybean. This period generally consisted of two discrete periods, a critical weed-free period and a critical time of weed removal. The critical weed-free period was relatively short in duration and consistent across locations and years. A period of weed control lasting up to the fourth node growth stage (V4), approximately 30 days after emergence (DAE), was adequate to prevent a yield loss of more than 2.5%. The critical time of weed removal was variable across loca

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27

Odero, Dennis C., and Alan L. Wright. "Phosphorus Application Influences the Critical Period of Weed Control in Lettuce." Weed Science 61, no. 3 (2013): 410–14. http://dx.doi.org/10.1614/ws-d-12-00107.1.

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Field studies were conducted in 2010 and 2011 at Belle Glade, FL, to evaluate the influence of phosphorus (P) applications (98, 196, and 293 kg P ha−1) on the critical period of weed control (CPWC) in lettuce. Natural populations of mixed weed species were allowed to interfere with lettuce in a series of treatments of both increasing duration of weed interference and the duration of weed-free period imposed within 98, 196, and 293 kg P ha−1levels added to the soil. The beginning and end of the CPWC for each P fertilization level based on a 5% acceptable marketable fresh lettuce yield loss leve

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28

Knezevic, Stevan Z., Sean P. Evans, Erin E. Blankenship, Rene C. Van Acker, and John L. Lindquist. "Critical period for weed control: the concept and data analysis." Weed Science 50, no. 6 (2002): 773–86. http://dx.doi.org/10.1614/0043-1745(2002)050[0773:cpfwct]2.0.co;2.

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29

Arslan, M., I. Uremis, and A. Uludag. "The critical period of weed control in double-cropped soybean." Phytoparasitica 34, no. 2 (2006): 159–66. http://dx.doi.org/10.1007/bf02981316.

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30

Singh, Manpreet, Makhan S. Bhullar, and Bhagirath S. Chauhan. "The critical period for weed control in dry-seeded rice." Crop Protection 66 (December 2014): 80–85. http://dx.doi.org/10.1016/j.cropro.2014.08.009.

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31

Chaudhari, Sushila, Katherine M. Jennings, David W. Monks, et al. "Critical Period for Weed Control in Grafted and Nongrafted Fresh Market Tomato." Weed Science 64, no. 3 (2016): 523–30. http://dx.doi.org/10.1614/ws-d-15-00049.1.

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Field experiments were conducted to determine the critical period for weed control (CPWC) in nongrafted ‘Amelia’ and Amelia grafted onto ‘Maxifort’ tomato rootstock grown in plasticulture. The establishment treatments (EST) consisted of two seedlings each of common purslane, large crabgrass, and yellow nutsedge transplanted at 1, 2, 3, 4, 5, 6, and 12 wk after tomato transplanting (WAT) and remained until tomato harvest to simulate weeds emerging at different times. The removal treatments (REM) consisted of the same weeds transplanted on the day of tomato transplanting and removed at 2, 3, 4,

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32

Campos, Caio Ferraz de, Arthur Arrobas Martins Barroso, Antonio Carlos da Silva Junior, Clebson Gomes Gonçalves, and Dagoberto Martins. "Periods of weed interference in maize crops cultivated in the first and second cycles." Semina: Ciências Agrárias 37, no. 5 (2016): 2867. http://dx.doi.org/10.5433/1679-0359.2016v37n5p2867.

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The interference of weeds in maize production may be reflected in grain yield losses that vary as a function of the density, stage and degree of aggressiveness of the species present. In the agricultural ecosystem, crops and weeds demand light, water, nutrients and space, which are frequently not available in sufficient quantities, leading to competition. The aim of this work was to determine the period of interference of weed plants, in particular of naked crabgrass (Digitaria nuda) on maize crop in the first and second harvest. The treatments were defined as increasing periods of coexistence

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33

Keller, Martina, Geoffroy Gantoli, Jens Möhring, Christoph Gutjahr, Roland Gerhards, and Victor Rueda-Ayala. "Integrating Economics in the Critical Period for Weed Control Concept in Corn." Weed Science 62, no. 4 (2014): 608–18. http://dx.doi.org/10.1614/ws-d-13-00184.1.

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The effect of weed interference on corn yield and the critical period for weed control (CPWC) were determined in Germany and Benin. Treatments with weed control starting at different crop growth stages and continuously kept weed-free until harvest represented the “weed-infested interval.” Treatments that were kept weed-free from sowing until different crop growth stages represented the “weed-free interval.” Michaelis–Menten, Gompertz, logistic and log–logistic models were employed to model the weed interference on yield. Cross-validation revealed that the log–logistic model fitted the weed-inf

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Kemp, Nathan J., Erin C. Taylor, and Karen A. Renner. "Weed Management in Glyphosate- and Glufosinate-Resistant Sugar Beet." Weed Technology 23, no. 3 (2009): 416–24. http://dx.doi.org/10.1614/wt-07-114.1.

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Field experiments were conducted to determine the critical period of weed interference in glyphosate- and glufosinate-resistant sugar beet, and to determine if PRE herbicides increased weed control or sugar beet root yield when glufosinate, glyphosate, or conventional POST herbicides were applied. Glyphosate- and glufosinate-resistant sugar beet root yields were reduced by up to 66 and 67%, respectively, when weeds remained all season in the weedy control treatment compared with yields when weed removal occurred as soon as the weeds were 2.5 cm tall, approximately 2 to 3 wk after planting (WAP

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35

Monteiro, A., I. Henriques, and I. Moreira. "Critical period for weed control in potatoes in the Huambo Province (Angola)." Planta Daninha 29, no. 2 (2011): 351–62. http://dx.doi.org/10.1590/s0100-83582011000200013.

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The effects of different weed management periods on potatoes were studied in three areas (Bailundo, Chianga and Calenga) of the central highlands of Angola and in three cropping seasons, from June 2005 to May 2007. Six weed-management treatments were used to identify critical periods of competition and to allow the development of more precise management recommendations. Total potato yield ranged from about 22 t ha-1 in weed-free plots to about 3 t ha-1 with no weed control a yield loss of 86%. Major weed species Galinsoga parviflora, Cyperus esculentus, Bidens biternata, Amaranthus hybridus, N

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36

Webster, Theodore M., Timothy L. Grey, J. Timothy Flanders, and A. Stanley Culpepper. "Cotton Planting Date Affects The Critical Period of Benghal Dayflower (Commelina benghalensis) Control." Weed Science 57, no. 1 (2009): 81–86. http://dx.doi.org/10.1614/ws-08-118.1.

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Benghal dayflower (formerly known as tropical spiderwort) is one of the most troublesome weeds in Georgia cotton. Field studies were conducted from 2003 to 2005 to evaluate the relationship between the duration of Benghal dayflower interference and cotton yield to establish optimum weed-control timing. To determine the critical period of weed control (CPWC), Benghal dayflower interference with cotton was allowed or prohibited in 2-wk intervals between 0 to 12 wk after crop planting. Maximum yield loss from Benghal dayflower in May-planted cotton was 21 to 30% in 2004 and 2005, whereas cotton p

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37

Motis, Timothy N., Salvadore J. Locascio, and James P. Gilreath. "Critical Yellow Nutsedge-free Period for Polyethylene-mulched Bell Pepper." HortScience 39, no. 5 (2004): 1045–49. http://dx.doi.org/10.21273/hortsci.39.5.1045.

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Yellow nutsedge (Cyperus esculentus L.) interference with bell pepper (Capsicum annuum L.) has become an important concern because of the phase-out of methyl bromide as a soil fumigant. The critical period for yellow nutsedge control in pepper was determined in two adjacent experiments (removal and plant-back) conducted twice in separate fields each Spring and Fall 2000 in Gainesville, Fla. In the removal experiment, nutsedge was planted with pepper in all but the full-season (13 weeks) weed-free controls and removed at 1, 3, 5, and 7 weeks after pepper transplanting (WAPT). Full-season weedy

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38

Frenda, Alfonso S., Paolo Ruisi, Sergio Saia, et al. "The Critical Period of Weed Control in Faba Bean and Chickpea in Mediterranean Areas." Weed Science 61, no. 3 (2013): 452–59. http://dx.doi.org/10.1614/ws-d-12-00137.1.

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Weeds are often the major biological constraint to growing legume crops successfully, and an understanding of the critical period of weed control (CPWC) is important for developing environmentally sustainable weed management practices to prevent unacceptable yield loss. Therefore, we carried out two field experiments to identify the CPWC for two grain legume crops traditionally grown in Mediterranean areas: chickpea and faba bean. The experiments were conducted at two sites both located in the Sicilian inland (Italy). In chickpea, when weeds were left to compete with the crop for the whole cyc

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Smitchger, Jamin A., Ian C. Burke, and Joseph P. Yenish. "The Critical Period of Weed Control in Lentil (Lens culinaris) in the Pacific Northwest." Weed Science 60, no. 1 (2012): 81–85. http://dx.doi.org/10.1614/ws-d-11-00069.1.

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The critical period of weed control (CPWC) for ‘Pardina’ and ‘Brewer’ lentil was determined in field experiments near Pullman, WA, in 2008 and 2009. Trial treatments were kept either weed free for periods of 0, 14, 25, 35, 45, 60, 75, or ∼90 d after emergence (DAE), or weeds were allowed to grow before removal for periods of 0, 14, 25, 35, 45, 60, 75, or ∼90 DAE. Averaged across varieties, lentil with season-long weed interference had 29.5 and 32% seed yield reduction compared to weed-free lentils in 2008 and 2009, respectively. When measured at crop maturity, a 1% loss in lentil seed yield re

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Charles, Graham W., Brian M. Sindel, Annette L. Cowie, and Oliver G. G. Knox. "Determining the critical period for broadleaf weed control in high-yielding cotton using mungbean as a mimic weed." Weed Technology 34, no. 5 (2020): 689–98. http://dx.doi.org/10.1017/wet.2020.38.

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AbstractResearch using the critical period for weed control (CPWC) has shown that high-yielding cotton crops are very sensitive to competition from grasses and large broadleaf weeds, but the CPWC has not been defined for smaller broadleaf weeds in Australian cotton. Field studies were conducted over five seasons from 2003 to 2015 to determine the CPWC for smaller broadleaf weeds, using mungbean as a mimic weed. Mungbean was planted at densities of 1, 3, 6, 15, 30, and 60 plants m−2 with or after cotton emergence and added and removed at approximately 0, 150, 300, 450, 600, 750, and 900 degree

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Swanton, Kevin Chandler, Anil Shrestha, and. "Weed seed return as influenced by the critical weed-free period and row spacing of no-till glyphosate-resistant soybean." Canadian Journal of Plant Science 81, no. 4 (2001): 877–80. http://dx.doi.org/10.4141/p01-049.

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Seed return from later-emerging weeds is a concern in soybean management systems based on critical periods for weed control. This study in Ontario estimated the weed seed return to the soil surface as influenced by the duration of weed control in soybean and soybean row spacing. Weeds emerging after the 1- to 2-trifoliate stage of soybean development did not increase the weed seedbank population compared to the residual population in the weed-free control. Weed seed return was greater in 76 cm than in 38 cm or 19 cm (twin rows) soybean row spacings. Key words: Seedbank, weed population dynamic

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Evans, Sean P., Stevan Z. Knezevic, John L. Lindquist, Charles A. Shapiro, and Erin E. Blankenship. "Nitrogen application influences the critical period for weed control in corn." Weed Science 51, no. 3 (2003): 408–17. http://dx.doi.org/10.1614/0043-1745(2003)051[0408:naitcp]2.0.co;2.

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GIBSON, LANCE R., and MATT LIEBMAN. "A Laboratory Exercise for Teaching Critical Period for Weed Control Concepts1." Weed Technology 17, no. 2 (2003): 403–11. http://dx.doi.org/10.1614/0890-037x(2003)017[0403:aleftc]2.0.co;2.

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LI, Bing-Hua, Yong-Xin ZHANG, Quan-Le BIAN, Zong-Ling LI, and Gui-Qi WANG. "Critical period of weed control in no-tillage summer maize fields." Chinese Journal of Eco-Agriculture 21, no. 8 (2013): 998–1003. http://dx.doi.org/10.3724/sp.j.1011.2013.00998.

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Tursun, Nihat, Avishek Datta, Emine Tuncel, Zekeriya Kantarci, and Stevan Knezevic. "Nitrogen application influenced the critical period for weed control in cotton." Crop Protection 74 (August 2015): 85–91. http://dx.doi.org/10.1016/j.cropro.2015.04.007.

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PADILHA, M., A. A. M. BARROSO, L. B. CARVALHO, F. R. COSTA, and S. BIANCO. "Atrazine Reduces the Critical Period of Weed Interference on Narrow Row Corn." Planta Daninha 34, no. 4 (2016): 721–28. http://dx.doi.org/10.1590/s0100-83582016340400012.

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ABSTRACT The objective was to determine whether a change occurs in the critical period of weed interference prevention in narrow row corn with the use of atrazine and whether there is influence of the herbicide on crop yield components. The treatments consisted of periods without or with an initial weed control (0, 21, 35, 49, 63, 77, and 91 days after emergence), with or without application of atrazine in spikely post-emergence. The experiment was carried out in a 2 x 7 randomized blocks design (with and without weed control and seven periods with three replications). The use or not of atrazi

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Geddes, Charles M., Adam S. Davis, and Erin Haramoto. "The critical period for weed seed control: A proposed framework to limit weed seed return." Weed Research 61, no. 4 (2021): 282–87. http://dx.doi.org/10.1111/wre.12480.

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Ghosheh, Hani Z., David L. Holshouser, and James M. Chandler. "The Critical Period of Johnsongrass (Sorghum halepense) Control in Field Corn (Zea mays)." Weed Science 44, no. 4 (1996): 944–47. http://dx.doi.org/10.1017/s0043174500094960.

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Experiments were conducted from 1989 to 1991 to determine the critical period of johnsongrass control in field corn. Maximum weed-infested and weed-free periods of 0 to 20 wk after corn emergence were maintained by either hand weeding or nicosulfuron application. Interference duration effects on corn grain yield were not affected by johnsongrass control methods. The critical period for johnsongrass control was determined to be between 3 and 6.5 wk after corn emergence to avoid losses above 5% of yield produced by full-season weed-free corn.

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Dunan, Claudio M., Philip Westra, Edward E. Schweizer, Donald W. Lybecker, and Frank D. Moore. "The Concept and Application of Early Economic Period Threshold: The Case of DCPA in Onions (Allium Cepa)." Weed Science 43, no. 4 (1995): 634–39. http://dx.doi.org/10.1017/s0043174500081753.

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The question of when to control weeds traditionally has been approached with the calculation of critical periods (CP) based on crop yields. The concept of economic critical period (ECP) and early (EEPT) and late (LEFT) economic period thresholds are presented as a comprehensive approach to answer the same question based on economic losses and costs of control. ECP is defined as the period when the benefit of controlling weeds is greater than its cost. EEPT and LEFT are the limits of the ECP and can be used to determine when first and last weed control measures should be performed. Calculation

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Mekdad, Ali A. A., Moamen M. Abou El-Enin, Mostafa M. Rady, Fahmy A. S. Hassan, Esmat F. Ali, and Ahmed Shaaban. "Impact of Level of Nitrogen Fertilization and Critical Period for Weed Control in Peanut (Arachis hypogaea L.)." Agronomy 11, no. 5 (2021): 909. http://dx.doi.org/10.3390/agronomy11050909.

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To avoid competing with economical plants, weed control must be implemented with a clean and appropriate strategy. Since the efficiency of leguminous crops in biological fixation of the atmospheric N2 is severely affected when grown under stressful conditions (the soil tested in this study was salt-affected; ECe = 8.99 dS m−1), an appropriate level of N fertilization should also be applied. Two field trials were performed in the 2018 and 2019 seasons to investigate the influences of soil-applied nitrogen (N) levels [48 (N1), 96 (N2), and 144 kg N ha−1 (N3)] and critical timing of weed removal

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