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Dissertations / Theses on the topic 'Downy mildew diseases. Cabbage'

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Published: 4 June 2021

Last updated: 13 February 2022

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1

Matheron, M. E., J. C. Matejka, and M. Porchas. "Field Testing of Potential New Fungicides for Control of Downy Mildew of Broccoli, Cabbage, and Cauliflower, 1993." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/214717.

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Downy mildew of broccoli, cabbage, and cauliflower is caused by the plant pathogenic fungus Peronospora parasitica. Cool damp weather with high humidity is highly favorable for sporulation, dissemination of spores, and infection by this pathogen. The severity of disease is affected by the duration of these weather conditions favorable for disease development. Potential new fungicides were evaluated for disease control in a field trial conducted in the winter of 1992-93. For broccoli, no significant differences in disease severity were detected among treatments. On the other hand, Microthiol an

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2

Butler, M. D., and J. A. Davis. "Broccoli Downy Mildew Trials." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/214161.

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3

Butler, Marvin. "Broccoli Downy Mildew Tolerance Trials." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/221456.

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4

Matheron, Michael E. "Biology and Management of Downy Mildew of Lettuce." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/579516.

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5

Matheron, M. E., and J. C. Matejka. "Downy Mildew of Broccoli - Promising New Fungicides for Disease Control." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/221432.

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Downy mildew of broccoli, caused by the fungus Peronospora parasitica, is a perennial disease problem affecting winter broccoli production in Arizona. During 1985-87, potential systemic fungicides were evaluated in the field for disease control. In the 1985-86 season, a period of high disease incidence, lesion development was significantly reduced by fosetyl-Al (44 %), phosphorous acid (42 %), oxadixyl + mancozeb (35 %), chlorothalonil (33 %), metalaxyl + mancozeb (30 %) and metalaxyl + chlorothalonil (28 %). During the 1986 -87 growing season, disease incidence was low and lesion development

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6

MacManus, Gerard P. V. "Development and extension of a disease forecasting and chemical control system for onion downy mildew /." St. Lucia, Qld, 2000. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16115.pdf.

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7

Gray, Alexander Bruce. "Host-parasite relationships in tissue cultures of sunflower and downy mildew." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72834.

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8

Matheron, Michael E., and Martin Porchas. "Downy Mildew of Broccoli: Comparison of Chemical Management Tools in 1997." College of Agriculture, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/221638.

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Downy mildew of broccoli is caused by the plant pathogenic fungus Peronospora parasitica. Cool damp weather with high humidity is highly favorable for sporulation, dissemination of spores, and infection by this pathogen. The severity of disease is affected by the duration of weather conditions favorable for disease development. Potential new fungicides were evaluated for disease management in a 1997 field trial. A moderate degree of downy mildew developed by crop maturity. All tested compounds except Trilogy provided significant reductions in the severity of disease compared to no treatment at

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9

Williams, Mia Gabrielle. "Impact of environmental conditions on the infection behaviour of Western Australian strains of Plasmopara viticola, causal agent of downy mildew in grapevines." University of Western Australia. Soil Science and Plant Nutrition Discipline Group, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0035.

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Downy mildew, caused by the biotrophic Oomycete Plasmopara viticola, is one of the most important diseases of grapevines world wide. It is particularly destructive in temperate viticultural regions that experience warm wet conditions during the vegetative growth of the vine (Wong et al., 2001). The disease is not normally a problem in mediterranean climates where the growing season tends to be hot and dry (Mullins et al., 1992; Sivasithamparam, 1993). Grape downy mildew is however a major disease in Australian viticulture (McLean et al., 1984; Magarey et al., 1991). Grape downy mildew was firs

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10

Matheron, Michael E., and Martin Porchas. "Downy and Powdery Mildew of Lettuce: Comparison of Chemical Management Tools in 1997." College of Agriculture, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/221600.

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Downy and powdery mildew are caused by the plant pathogenic fungi Bremia lactucae and Erysiphe cichoracearum, respectively. Cool and moist environmental conditions favor development of downy mildew, while warmer and dry weather is conducive for development of powdery mildew. Potential new fungicides were evaluated for management of these diseases in 1997. A very low level of downy mildew occurred during this trial; however, all treatments significantly reduced the number of leaf lesions compared to nontreated lettuce plants. Powdery mildew was quite intense at crop maturity and was significant

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11

Matheron, Michael E., and Martin Porchas. "Assessment of Fungicide Performance on Control of Downy Mildew of Broccoli in 1998." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/221660.

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Peronospora parasitica is the pathogen responsible for causing downy mildew of broccoli, cabbage and cauliflower. Cool moist environmental conditions favor the development of downy mildew on these crops. Several potential new fungicides were evaluated for control of this disease on broccoli in 1998. The final severity of downy mildew in this trial was moderately high. Significant reduction in disease severity compared to nontreated plants was achieved by application of standard compounds such as Aliette, Bravo, maneb and Trilogy as well as the new fungicides Actigard, an Unknown, Curzate, Quad

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12

Matheron, Michael E., and Martin Porchas. "Management of Downy Mildew on Broccoli: Efficacy of Fungicides in 1996 Field Trial." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/214749.

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Downy mildew of broccoli is caused by the plant pathogenic fungus Peronospora parasitica. Cool damp weather with high humidity is highly favorable for sporulation, dissemination of spores, and infection by this pathogen. The severity of disease is affected by the duration of weather conditions favorable for disease development. Potential new fungicides were evaluated for disease management in a field trial conducted in 1996. Disease pressure was moderate and all tested fungicides except Ridomil MZ 72 and one Ciba G + Mancozeb treatment significantly reduced the number of downy mildew lesions o

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13

Santamaria, Luisa. "Evaluation of lima bean (Phaseolus lunatus) germplasm for resistance to downy mildew, and epidemiological and biological studies of its causal agent, Phytophthora phaseoli." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 159 p, 2008. http://proquest.umi.com/pqdweb?did=1456289191&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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14

Matheron, M. E., and J. C. Matejka. "Comparison of Different Fungicides for Control of Downy Mildew of Broccoli -- 1991 Field Trial." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/221454.

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Downy mildew of broccoli, caused by the plant pathogenic fungus Peronospora parasítica, can be found every year in many broccoli fields in Arizona. The severity of the disease is affected by the occurrence and duration of weather conditions favorable for disease development. During the 1990-91 vegetable season in western Arizona, different fungicides and rates of materials were evaluated in the field for disease control. Ridomil /Bravo and Bravo, which are currently registered for use on broccoli to control downy mildew, and Aliette, which is currently not registered for use on this crop, prov

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15

Matheron, Michael E., and Martin Porchas. "Evaluation of New Fungicides for Management of Downy and Powdery Mildew of Lettuce in 1998." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/221659.

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Bremia lactucae and Erysiphe cichoracearum, respectively, cause downy and powdery mildew of lettuce. Cool moist environmental conditions favor the development of downy mildew, whereas warm and dry weather is conducive for powdery mildew. Several potential new fungicides were evaluated for control of these diseases of lettuce in 1998. The final severity of downy mildew in this trial was low. In addition to the standard compounds maneb, Aliette and Trilogy, several fungicides currently in development significantly reduced the severity of downy mildew compared to nontreated plants. These chemistr

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16

Matheron, Michael E., and Martin Porchas. "Management of Downy and Powdery Mildew on Lettuce: Efficacy of Fungicides in 1996 Field Trial." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/214738.

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Downy and powdery mildew are caused by the plant pathogenic fungi Bremia lactucae and Erysiphe cichoracearum, respectively. Cool and moist environmental conditions favor development ofdowny mildew, while warmer and dry weather is conducive for development of powdery mildew. Potential new fungicides were evaluated for management of these diseases in 1996. Both downy and powdery mildew developed in the test plots. All tested materials significantly reduced the severity of downy mildew compared to plants not treated with a fungicide. Compared to nontreated control plants as well as some tested ma

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17

Matheron, Michael E., and Martin Porchas. "Field Evaluation of Potential New Fungicides for Control of Downy Mildew of Broccoli in 1994 and 1995." College of Agriculture, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/221472.

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Downy mildew of broccoli is caused by the plant pathogenic fungus Peronospora parasitica. Cool damp weather with high humidity is highly favorable for sporulation, dissemination of spores, and infection by this pathogen. The severity of disease is affected by the duration of weather conditions favorable for disease development. Potential new fungicides were evaluated for disease control in field trials conducted during 1994 and 1995. Downy mildew did not occur in the 1994 trial. In 1995, disease was moderate and all tested fungicides provided significant disease control compared to no treatmen

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18

Tchervenivanova, Eli. "Development of a model to predict sporulation of Bremia lactucae in lettuce." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23943.

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The effect of temperature and duration of leaf wetness (DLW) on sporulation of Bremia lactucae was determined for lettuce cv. Ithaca. A single spore isolate of B. lactucae was produced and was identified using lettuce differential lines each of which had known gene for resistance. Potted lettuce plants were inoculated with the isolate and incubated at 15 C, at 100% relative humidity for 24 h and then at a relative humidity lower than 70%. Seven days later, the plants were submitted to five different temperatures (5, 10, 15, 20 and 25 C) and six durations of leaf wetness (4, 6, 8, 10, 12 and 14

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19

Lakkis, Sara. "Résistance systémique induite par Pseudomonas fluorescens et Bacillus subtilis chez des génotypes de vigne de différentes sensibilités au mildiou et à la pourriture grise Strengthening Grapevine Resistance by Pseudomonas fluorescens PTA-CT2 Relies on Distinct Defense Pathways in Susceptible and Partially Resistant Genotypes to Downy Mildew and Gray Mold Diseases." Thesis, Reims, 2019. http://www.theses.fr/2019REIMS025.

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Le mildiou causé par l'oomycète Plasmopara viticola et la pourriture grise causée par le champignon Botrytis cinerea font partie des maladies les plus menaçantes dans les vignobles. La stratégie actuelle de lutte contre ces maladies repose entièrement sur l'utilisation de fongicides chimiques. L'utilisation de bactéries bénéfiques apparaît comme une stratégie durable permettant de contrôler diverses maladies. Cette méthode est principalement basée sur l'activation de l’immunitaire innée des plantes, se traduisant par une résistance systémique induite (ISR). Une telle stratégie est rendue possi

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20

Brammer, Ronel. "A study on the use of homoepathic preparations for the control of downy mildew on cabbage." Thesis, 1995. http://hdl.handle.net/10321/2740.

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Dissertation submitted in partial compliance with the requirements for the Master's Diploma in Technology in Homeopathy at Technikon Natal, 1995.<br>The purpose of this research was to evaluate the efficacy of a homeopathic remedy prepared from Peronospora parasitica in the treatment of downy mildew on cabbage seedlings by measuring the percentage leaf area infected. Four different homeopathic potencies were used. Three fungicidal and a water treatment serving as controls. Special attention was paid to curative and preventative functions.<br>M

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21

Hayes, Matthew Allan. "Identification of host genes involved in the biotrophic interaction between grapevine and powdery mildew." 2006. http://hdl.handle.net/2440/37876.

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Grapevine powdery mildew is caused by Erysiphe necator, an Ascomycete fungus and an obligate biotroph restricted to growth on its grapevine host. Biotrophic pathogens form a stable association with host cells without directly causing cell death, and take up nutrients from, in the case of powdery mildew ( PM ), host epidermal cells ( Rumbolz et al., 2000 ). As the fungus grows, its increasing biomass becomes a strong nutrient sink capable of altering assimilate flow and storage in the host. To identify host genes that may mediate nutrient delivery to powdery mildew infected tissues and therefor

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22

Dawson, Nicole. "The effect of homoeopathic potencies of a fungicide, Acrobat (Dimethomorph and Mancozeb), on downy mildew (Peronospora parasitica) of cabbage seedlings (Brassica oleracea)." Thesis, 2000. http://hdl.handle.net/10321/2826.

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Dissertation submitted in partial compliance with the requirements for the Masters Degree in Technology: Homoeopathy, Technikon Natal, 2000.<br>The purpose of this study was to expand on previous research in Homoeopathy, using the cabbage (Brassica oleracae) and crucifer downy mildew (Peronospora parasitica) disease system. More specifically, this study aimed to evaluate the biological effects of homoeopathic treatments made from a fungicide, Acrobat, on the development of downy mildew on cabbage seedlings. The object was to demonstrate the Arndt-Schulz Law or Hormesis (inhibition of growth at

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23

Mariote, David. "Response to selection for downy mildew (Peronosclerospora sorghi) and maize streak virus resistance in three quality protein maize populations in Mozambique." Thesis, 2007. http://hdl.handle.net/10413/748.

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24

Mafu, Nothando Fowiza. "Marker-assisted selection for maize streak virus resistance and concomitant conventional selection for Downy Mildew resistance in a maize population." Thesis, 2013. http://hdl.handle.net/10413/10023.

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Maize streak virus (MSV) disease, transmitted by leafhoppers (Cicadulina mbila, Naude), and maize downy mildew (DM) disease caused by Peronosclerospora sorghi (Weston and Uppal) Shaw, are major contributing factors to low maize yields in Africa. These two diseases threaten maize production in Mozambique, thus the importance of breeding Mozambican maize varieties that carry resistance to these diseases. Marker-assisted selection (MAS) was employed to pyramid MSV and DM disease resistant genes into a single genetic background through simultaneous selection. Firstly, it was essential to determine

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25

Fato, Pedro. "Investigation of heterotic patterns and genetic analysis of Downy mildew resistance in Mozambican lowland maize (Zea mays L.) germplasm." Thesis, 2010. http://hdl.handle.net/10413/5037.

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In Southern Africa and Mozambique, tropical lowland accounts for 22% and 65%, respectively, of area under maize production, but grain yield is compromised by downy mildew disease (DM, which is caused by Peronosclerospora sorghi (Weston and Uppal) Shaw), and lack of appropriate varieties, especially hybrids. Among other factors, productivity can be enhanced by deploying DM resistant hybrids, which are higher yielding than open pollinated varieties. Development of a viable hybrid-breeding programme requires knowledge of genetic effects governing yield and DM resistance in inbreds, and effective

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26

Curnow, Janine Margaret. "The relative effectiveness of homoeopathic potencies of Peronospora parasitica compared to Acrobat (dimethomorph and mancozeb) and Bravo (chlorothalonil) in the control of downy mildew in cabbage seedlings." Thesis, 1998. http://hdl.handle.net/10321/1940.

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A dissertation submitted in partial compliance with the requirements for the Master's Degree in Technology: Homoeopathy, Technikon Natal, 1998.<br>The downy mildews are fungal pathogens which cause severe epidemics on many crops, and are difficult to control by either management practices or fungicides. Homoeopathic medicines have been investigated for their control of fungi, with promising results. However, there are a few well conducted trials in the homoeopathic literature. In particular, the lack of statistical analyses is evident in most of the work done to date. The purpose of this

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27

Bratoloveanu, J. I. "Species of Pythium associated with barley in South Australia / by J.I. Bratoloveanu." 1985. http://hdl.handle.net/2440/20339.

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Bibliography: leaves 140-158<br>ix, 158 leaves, [23] leaves of plates : ill., 1 map ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.1985) Dept. of Plant Pathology, University of Adelaide

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