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Dissertations / Theses on the topic 'Millets – Storage – Diseases and injuries'

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Published: 4 June 2021

Last updated: 16 February 2022

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1

Ouellette, Eric. "Volatile profiles for disease detection in stored carrots and potatoes." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63898.

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2

Myburgh, Lindie. "Prediction of post-storage quality in canning apricots and peaches using near infrared spectroscopy (NIRS) and chemometrics." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53557.

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Thesis (MSc Food Sc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Post-storage quality of the stone fruit, apricots and peaches, is the major factor determining their suitability for canning after cold storage in South Africa. Short harvesting periods and the limited capacity of the factory to process the large quantities of fruit within two days after delivery, necessitates cold storage until canning. Apricots develop internal breakdown, whereas peaches develop internal breakdown accompanied by loosening of the skin and adhesion of the flesh to the stone. The deterioration takes

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3

Sing, Sharlene E. "Suppression of bruchids infesting stored grain legumes with the predatory bug Xylocoris flavipes (Reuter) (hemiptera: anthocoridae)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29789.pdf.

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4

Fennir, Mohamed A. "Respiratory response of healthy and diseased potatoes (Solanum tuberosum L.) under real and experimental storage conditions." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38187.

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This study investigates respiration rate of potatoes (Solanum tuberosum L.) under real and experimental storage conditions. Real storage conditions were obtained by building a small-scale storage facility equipped with two independent storage bins including all controls. Each bin was filled with 2.5 metric tons of potatoes and these were stored for five months. Temperature, relative humidity, air flowrate and other operational parameters were collected. Also, mass loss and CO2 analyses were performed.<br>A heat and moisture balance was applied to quantify heat and moisture rates produced by po

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5

Lui, Leung Hong 1952. "Factors influencing disease development and volatile production by Fusarium sambucinum and Pythium ultimum in stored potatoes." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31262.

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Tubers of Russet Burbank were surface disinfested and 3 mm diameter by 3 mm deep wounds were made with cork borer. The holes were inoculated with 20muL of 104 macroconidia/ml suspension of (Fusarium sambucinum) or 20muL of 104 sporangia/ml suspension (Pythium ultimum) and incubated under mist. For infection studies, the inoculated tubers were exposed to 0--48 h of mist at 4--20ºC, dried and stored at 16ºC and 95% RH in growth chamber with forced air for 15 d (F. sambucinum), whereas stored at 12ºC and 95% RH for 30 d (P. ultimum). For lesion expansion studies tubers exposed to 24 h wet at 16ºC

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6

Ranganna, Byrappa. "Thermal treatments for short-term storage of potato (Solanum tuberosum L.)." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40429.

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The potential of hot water dipping, vapour heating or ultraviolet irradiation to eliminate the use of chemicals for control of sprouting and post-harvest diseases of the potato (Solanum tuberosum L.) was examined. The microorganisms on which these treatments were tested were the fungal dry rot (Fusarium solani) and the bacterial soft rot (Erwinia carotovora pv. carotovora), two major post-harvest pathogens of potatoes. The study focused on short-term storage (three months) at 8$ sp circ$C or 18$ sp circ$C, which are representative of storage temperatures used by producers in northern temperate

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7

Burger, G. E. (Gerrit Erasmus). "Factors affecting shrivelling and friction discolouration of pears (Pyrus communis L. )." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/16264.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Shrivelling and friction discolouration (FD), as postharvest disorders, negatively influence the marketability and potential shelf life of pears. By investigating the contributing factors in each of the disorders, the potential involvement of handling and storage variables were determined. This allowed for a better understanding of the responsible factors that create susceptible environments for these disorders to occur. From the moment that pears are harvested they lose weight by means of transpiration and, to a l

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8

Tasneem, Azra. "Postharvest treatments to reduce chilling injury symptoms in stored mangoes." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81444.

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The market life of many fruits and vegetables can be extended through storage at low temperatures. Chilling injury (CI) is a major postharvest storage problem for tropical commodities. Storing these products at temperatures below their critical temperature may result in severe physiological disorders known as CI symptoms. Mangoes (Mangifera indica. L) are susceptible to CI when stored below 12 °C. Visual CI symptoms include uneven ripening, surface pitting, discoloration, shriveling and scalding. Research has been conducted to overcome these serious problems using various postharvest tr

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9

Smith, Frisby Davis Tad. "Evaluation of fungicide resistance in Sclerotinia minor and strategies for chemical control of sclerotinia blight of peanut." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/38958.

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10

Khumalo, Ngcebo Parton. "Factors affecting post-storage quality of "Nules Clementine" mandarin fruit with special reference to rind breakdown /." Thesis, Link to online version, 2006. http://hdl.handle.net/10019/559.

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11

Matare, Tsaurayi Edwin. "Postharvest losses and changes in physico-chemical properties of fruit (peaches, pears and oranges) at retail and during post-purchase storage." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71974.

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Thesis (MScFoodSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Postharvest fruit loss is a major challenge in addressing food security, sustainable management of resources and profitability of agribusiness. The incidence of postharvest loss and changes in physico-chemical properties of three types of fruit (peaches, pears and oranges) were evaluated at retail and during post-purchase storage. The amount of physical loss at the three retail outlets studied ranged from 3.61% to 18.09% among the fruit types, with the highest incidence occurring in peaches. The estimated annual national p

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12

Njombolwana, Ncumisa Shelly. "Imazalil and wax coating application in citrus packhouses to control green mould and preserve fruit quality." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20419.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Green mould is a major citrus postharvest disease caused by a wound pathogen called Penicillium digitatum. Imazalil (IMZ) is the most important postharvest fungicide that is currently registered against green mould and blue mould, given its good protective and curative control and sporulation inhibition. Imazalil can be applied in drench, dip, spray and wax coating applications. Wax coatings improve the quality of the fruit during shelf life by limiting moisture loss and providing a shiny appearance. The primary objective o

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13

Sinada, Nour Awad Elkarim. "Success of development and extent of feeding damage of stored-product insects in cultivars of sorghum and millet." 1986. http://hdl.handle.net/2097/22152.

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14

Asanga, Cletus Tangwe. "Changes in environment, grain quality, and insect populations in pearl millet, Pennisetum americanum (L.) Leeke, stored in airtight containers or underground pits." 1985. http://hdl.handle.net/2097/27390.

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15

Kritzinger, Quenton. "Storage fungi and mycotoxins associated with cowpea." Diss., 2001. http://hdl.handle.net/2263/25004.

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Cowpeas (Vigna unguiculata (L.) Walp) is an important African indigenous legume crop for the livelihoods of many relatively poor people residing n less developed countries of the tropics. Rural families derive a nutritious food, animal feed and in income from the production of this crop. Storage of seed is certainly the most important post-harvest operation but the losses incurred are great. These losses, due to an inability to effectively control physical and biological factors, result in problems with storage insects, moisture and associated fungi. Seeds are particularly susceptible to funga

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16

Sullivan, Kathleen Marie. "Investigations of the potential for chilling injury during storage of chile peppers (Capsicum annuum L. and C. frutescens L.) /." 2000. https://scholarworks.umass.edu/theses/3487.

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17

Uthairatanakij, Apiradee, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Responses of nectarines to atmospheres containing high carbon dioxide concentrations." 2003. http://handle.uws.edu.au:8081/1959.7/28106.

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Nectarines suffer low temperature disorders (LTD)when stored for more than 2 - 3 weeks at temperatures below 8 degrees C. LTD take the form of flesh bleeding and browning, loss of juiciness, development of mealiness and failure to ripen normally.It has been shown previously that adding about 15% CO2 to the storage atmosphere at 0 degrees C can delay the development of LTD in some cvv. of peaches and nectarines. The initial aim of this research was to explore the genetic basis of the differences among cultivars in the responses to high CO2.After much investigation, it was shown that both geneti

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18

Moradinezhad, Farid. "Effects of 1-methylcyclopropene (1-MCP) on shelf life and quality of Cavendish bananas." 2006. http://hdl.handle.net/2440/57116.

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Title page, summary and table of contents only. The complete thesis in print form is available from the University of Adelaide Library.<br>"This study examined how the efficacy of 1-MCP varies throughout the year; the effect of concentration, duration and timing of ethylene application; the effect of hand position on the bunch; the timing of 1-MCP application in relation to ripening and harvest time; and the effect of ripening storage temperatures and chilling storage .. The findings of this study allow 1-MCP to be used in a more commercially reliable manner" -- from Abstract.<br>http://proxy.

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19

Visser, Diedrich. "The potato tuber moth, Phthorimaea operculella (Zeller), in South Africa: potential control in non-refrigerated store environments." Thesis, 2004. http://hdl.handle.net/2263/24831.

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Please read the abstract in the section 00front of this document. Also note that an abstract is provided for each chapter as well<br>Thesis (DPhil (Entomology))--University of Pretoria, 2005.<br>Zoology and Entomology<br>unrestricted

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20

Stafford, Gary Ivan. "Storage of frequently used traditional South African medicinal plants." Thesis, 2003. http://hdl.handle.net/10413/5639.

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The post-harvest physiology of nine frequently used indigenous southern African medicinal plants was investigated, in particular the effects of storage time and accelerated ageing on the biological activity and chemical constituents of these plants. Water, ethanol and hexane extracts of fresh plant material as well as material that had been stored in dry form in paper bags at room temperature for 90 days (short-term) were tested. Three bioassays, the COX-1 anti-inflammatory assay, nematode anthelmintic assay and minimum inhibitory concentration anti-bacterial assay, were used to determine biol

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21

Van, Rooyen Zelda. "Factors affecting mesocarp discolouration severity in 'Pinkerton' avocados (Persea americana MILL.)." Thesis, 2005. http://hdl.handle.net/10413/4557.

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The susceptibility of the 'Pinkerton' avocado cultivar to mesocarp discolouration, after storage, has seriously threatened its export from South Africa. This disorder has proven to be complex, requiring a better understanding of the fruit's physiology. The purposes of this study were to identify the role of pre- and postharvest factors, or their interactions, in the development of the problem. This was done by obtaining fruit from several production areas of varying mesocarp discolouration histories (referred to as "high", "medium" or "Iow risk" areas) during the 2000 and 2001 seasons. Fruit w

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22

Archibald, Alison Joy. "Development of a sulphur free litchi storage protocol using sealed polypropylene bags." Thesis, 2006. http://hdl.handle.net/10413/3833.

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The use of sulphur as a method of postharvest disease control and colour retention in litchis is soon to be restricted by the European Union. It is therefore essential that new postharvest treatments and packaging techniques be developed in order to retain internal and external fruit qualities and thus allow for export. Good litchi quality is not only important for the export market but also for use on the local market. In this study, alternative methods for postharvest quality control were investigated with the aim of extending the litchi storage life to 40 days under modified storage. Packag

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23

Cindi, Melusi. "Developing alternative technologies to control brown rot (monilinia laxa) in peaches during postharvest storage." 2015. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001869.

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M. Tech. Agriculture<br>Brown rot caused by Monilinia laxa is the main pre and postharvest disease of peaches; it affects the shelf life and marketability of peaches. Increasing consumer concern regarding food safety makes it necessary to search for natural environmentally friendly alternative products for postharvest disease control. The objective of this study is to develop an environmentally friendly essential oil technology for the control of brown rot (M. laxa) in peaches at postharvest stage to replace the currently used synthetic fungicide (Iprodione)

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24

Siboza, Xolani Irvin. "Methyl jasmonate and salicylic acid enhance chilling tolerance in lemon (citrus limon) fruit." Thesis, 2013. http://hdl.handle.net/10413/10872.

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South African ‘Eureka’ lemon fruit must be exposed to chilling temperatures (± 0.6°C) as a mandatory quarantine treatment against insect pests for all its overseas markets. Chilling lemon fruit at such temperatures may develop chilling injury (CI) symptoms on the flavedo. This negative effect on fruit quality reduces fruit marketability. This study evaluated postharvest factors influencing physiological, biochemical and ultra-structural mechanisms involved in alleviating CI in lemon fruit. It was hypothesised that treatment with methyl jasmonate (MJ) and salicylic acid (SA) may enhance chillin

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25

Lutge, Andre. "Ultra-low temperature shipping and cold chain management of 'fuerte' avocados (Persea americana Mill.) grown in the KwaZulu-Natal Midlands." Thesis, 2011. http://hdl.handle.net/10413/10007.

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‘Fuerte’ makes up 25% of the avocados exported from South Africa to European markets and requires shipping periods of up to 28 days and a correctly managed cold chain. A temperature of 5.5°C and expensive CA and 1-MCP treatments are currently used to delay ripening over this lengthy cold chain; however, fruit still appear on the European market showing signs of softening and physiological disorders. Increased competition on the global market and the disadvantage of a particularly long distance to the European market has challenged the South African export industry. These challenges have necess

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26

Kwinda, Grace Thiambi. "Detection and molecular identification of Mucorales isolated from spoilt agricultural commodities collected in fresh produce markets in Gauteng province, South Africa." Diss., 2014. http://hdl.handle.net/10500/19632.

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Fruit and vegetables are often spoilt during storage, handling and transportation due to microorganisms. The common spoilage causes are fungi within the order Mucorales, the largest order of the class Zygomycetes. Such spoilage can result in reduced food supplies, poor quality and severe losses to producers and traders. The study was to investigate the type of Mucorales prevalent in various commodities and in a particular market than others. Fifty infected papaya, peaches and strawberries were collected at five occasions from large, medium and small markets. Isolation was done aseptically in

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27

Siboza, Xolani Irvin. "Effect of methyl jasmonate and salicyclic acid on chilling injury of 'eureka' lemons." Thesis, 2010. http://hdl.handle.net/10413/7887.

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South Africa is the second largest exporter of citrus fruit in the world. There has recently emerged a strong demand for lemons in the world market due to their nutritional value, culinary and non-culinary uses. During exportation, fruit are subjected to low temperature (-0.5°C) for varying periods of time as an obligatory quarantine treatment. However, lemons are sensitive to low temperatures and easily develop chilling injury during this obligatory quarantine treatment. This has become a major limitation to the expansion of South Africa’s lemon industry. Postharvest treatments with methyl ja

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28

Mathaba, Nhlanhla. "The cascade of physiological events leading to chilling injury : the effect of post-harvest hot water and molybdenum applications to lemon (citrus limon) fruit." Thesis, 2012. http://hdl.handle.net/10413/9859.

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New emerging markets such as Japan and the United States require cold sterilisation of South African citrus fruit as a phytosanitary standard against fruit fly. However, citrus fruit are chilling susceptible, with lemons being the second-most chilling susceptible after grapefruit. Chilling injury is a physiological rind disorder; the occurrence of which is despite its prevalence in horticultural commodities, not well understood. Therefore, the aim of this study was to investigate physiological compounds regulating chilling susceptibility or resistance in citrus fruit, with special emphasis on

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29

Mditshwa, Asanda. "The potential of post-harvest potassium silicate dips to mitigate chilling injury on citrus fruit." Thesis, 2012. http://hdl.handle.net/10413/7892.

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The South African Citrus Industry is the second largest exporter of citrus, after Spain. The industry is under pressure to supply high quality fruit as well as to expand into new, high paying markets. However, high paying markets such as Japan and the USA require cold sterilised fruit as obligatory quarantine treatments against Mediterranean fruit fly (Ceratitis capitata) in order to reduce any possible spread of the pest. Citrus fruit originated from tropical climates and hence are chilling susceptible. Chilling injury symptoms appear as dark brown spots, pitting and/or decay when fruit are t

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