Pest management in cowpea. Part 3. Quantifying the effect of cowpea field pests on grain yields in eastern Uganda

We used regression analysis to quantify yield variations in cowpea due to major insect pests, i.e., aphids ( Aphis craccivora Koch), thrips ( Megarulothrips sjostedti Trybom), Maruca pod borer ( Maruca vitrata Fabricius) and a complex of pod-sucking bugs. Variability in pest infestation was created...

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Bibliographic Details
Published inCrop protection Vol. 19; no. 5; pp. 343 - 347
Main Authors Karungi, J, Adipala, E, Nampala, P, Ogenga-Latigo, M.W, Kyamanywa, S
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2000
Subjects
Aphids
Grain yield
Maruca
Pod-sucking bugs
Stepwise regression
Thrips
Vigna unguiculata
Stepwise regression
Maruca
Grain yield
Vigna unguiculata
Thrips
Aphids
Pod-sucking bugs
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Summary:We used regression analysis to quantify yield variations in cowpea due to major insect pests, i.e., aphids ( Aphis craccivora Koch), thrips ( Megarulothrips sjostedti Trybom), Maruca pod borer ( Maruca vitrata Fabricius) and a complex of pod-sucking bugs. Variability in pest infestation was created by growing Ebelat (an erect cowpea cultivar) in two locations over three seasons and under different insecticide spray schedules. Stepwise regression for individual locations and seasons’ data indicated that most of the variation in cowpea grain yields was caused by thrips. We estimated that to the total variation in cowpea grain yields, on average, the major pests contribute 51–69% in Pallisa and 24–48% in Kumi. Thrips alone contribute 35–41% and 13–19% at these two sites, respectively.
ISSN:0261-2194
1873-6904
DOI:10.1016/S0261-2194(00)00027-2