A multivariate analysis of growth and development parameters of the legume pod borer,Maruca testulalis on variably resistant cowpea cultivars |
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| Authors: | S. Oghiakhe and A. Odulaja |
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| Affiliation: | (1) International Institute of Tropical Agriculture (IITA), Oyo Road, P.M.B. 5320, Ibadan, Nigeria;(2) Department of statistics, University of Ibadan, Ibadan, Nigeria;(3) Present address: Mbita Point Field Station, International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30, Mbita, Kenya |
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| Abstract: | Principal component analysis was employed to study the variation patterns in 18 cowpea cultivars developed for resistance toMaruca testulalis Geyer (Lepidoptera: Pyralidae) based on 7 developmental parameters of the pest on floral buds, flowers and sliced pods. On the whole, three developmental parameters: percentage pupation (V2), percentage emergence (V5) and growth index (V7) were the most important for the grouping of the cultivars with respect toM. testulalis damage. However, out of the three parameters, growth index (V7) had the highest factor score. Using the cluster analysis technique, the cultivars were sorted into five distinct groups for each part. The importance of these findings in the determination of protection periods for particular cultivars and cultural control studies ofM. testulalis in cowpea are discussed. |
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| Keywords: | Maruca testulalis cowpea variation resistance principal component analysis |
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