Chemical Control of Red Spider Mite (Tetranychus Urticae Koch) on Tomatoes in Zambia

Jensen, Anne; Mingochi, D. S.

doi:10.17660/actahortic.1988.218.33

Cited by 4 publications

(2 citation statements)

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“…Tetranychus urticae has been reported to cause damage on tomato in many Sub-Saharan African countries including South Africa (Daiber 1996), Zambia (Jensen and Mingochi 1988), Zimbabwe (Sibanda et al 2000) and semi-arid areas in Kenya (Varela et al 2003). While many studies have been undertaken on spatial and temporal distribution patterns as well as damage levels in greenhouse grown tomatoes (Hussey and Scopes 1985;Stacey et al 1985;Nihoul et al 1991;Nihoul 1993a, b;Kielkiewicz 1996), little is known about field-grown tomatoes (Abdel-Shaheed et al 1971;Bezert 1999).…”

Section: Introductionmentioning

confidence: 99%

Population models for threshold-based control of Tetranychus urticae in small-scale Kenyan tomato fields and for evaluating weather and host plant species effects

et al. 2006

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The spatial distribution of motile life stages of the two-spotted spider mite Tetranychus urticae Koch in Kenyan small-scale tomato fields was described by Taylor's power law and an enumerative sampling plan was designed for research purposes. The exponential increase of T. urticae populations during three growing seasons permits the development and use of a simple exponential model for the design of a threshold-based chemical control system. For this purpose, a critical threshold of 440 motile mites per sample unit at the end of the growing season (12 weeks after transplanting) was translated into a proportion of 0.83 infested units in sample 3, i.e. five weeks after transplanting. A sequential binomial sampling plan with respect to the proportion of 0.83, five weeks after transplanting, was designed. The exponential model was extended to account for the influence of weather and host plant species. Model development and parameter estimation were based on three data sets (Kenyan tomato fields, Italian and Californian strawberry fields). The model satisfactorily predicted a positive influence on growth rates by (i) changing the host plant from tomato to strawberry, and (ii) temperature, while a negative effect resulted from (iii) rainfall; both (ii) and (iii) are controlled by temperature-rainfall interactions. In contrast, the estimated parameter values did not satisfactorily describe the expected responses at specific temperature and rainfall values. Nevertheless, the model allowed the rating of host plant species in the field. A fourth data set from Swiss apple orchards was used to test the model, and population build-up on the apple host plant appeared to be higher than on tomatoes but lower than on strawberry.

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Section: Introductionmentioning

confidence: 99%

Population models for threshold-based control of Tetranychus urticae in small-scale Kenyan tomato fields and for evaluating weather and host plant species effects

et al. 2006

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“…Heinz 1370 is a determinate tomato cultivar (Jensen and Mingochi, 1988), originally from the United States of America, but currently grown in most of the world including developing countries. It is the primary cultivar grown in the Kamuli District of Uganda and farmers may save seed for future crops.…”

Section: Tomato Cultivarsmentioning

confidence: 99%

Evaluating horticultural practices for sustainable tomato production in Kamuli, Uganda

Tusiime

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Tomatoes are a source of income and food security for small-landholder farmers across Uganda, including the Kamuli District. Studies regarding sustainable practices are needed to increase production of the crop and improve farmers' livelihoods. This study investigated three tomato cultivars, Heinz 1370, Nuru F1, and MT 56, pesticide application, staking, and mulching for their effect on yield, disease severity and gross margin of tomato production in the Kamuli District of Uganda. The treatments were tested in a randomized complete block design with a factorial and split-plot arrangement during two growing seasons in 2013. Total and marketable fruit number, marketable fruit weight, gross margin, and disease severity (assessed using the area under disease progress curve) were measured.Results indicated that disease-resistant cultivar, MT 56, in combination with pesticide application and soil mulch provided the highest marketable fruit number and marketable fruit weight and all treatments had a positive gross margin in the first season. A combination of MT 56, no pesticide application and no mulch resulted in the only positive gross margin in season two. Application of pesticides reduced disease severity (early blight, Alternaria solani) for all cultivars in season one, and in season two for Heinz 1370 and Nuru F1, but did not affect disease severity for MT 56 in the second season. Using soil mulch reduced the severity of early blight disease, but decreased the gross margin when purchased. Staking did not affect yield or disease severity of plants and decreased the gross margin. 1 CHAPTER 1: GENERAL INTRODUCTION Written in the format of HortScience, a journal of the American Society for Horticultural Science Thesis Organization This thesis includes three chapters. Chapter one is a general introduction to the research. The second chapter is a manuscript that presents research results from experiments to determine sustainable horticultural practices for producing tomatoes in the Kamuli District of Uganda. The third chapter includes general conclusions of the studies and recommendations for further research.

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Mites

Brust

Gotoh

2018

Sustainable Management of Arthropod Pests of Tomato

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Chemical Control of Red Spider Mite (Tetranychus Urticae Koch) on Tomatoes in Zambia

Cited by 4 publications

References 0 publications

Population models for threshold-based control of Tetranychus urticae in small-scale Kenyan tomato fields and for evaluating weather and host plant species effects

Population models for threshold-based control of Tetranychus urticae in small-scale Kenyan tomato fields and for evaluating weather and host plant species effects

Evaluating horticultural practices for sustainable tomato production in Kamuli, Uganda

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