INSECT PESTS OF COWPEA [Vigna unguiculata (L.) Walp.] AND THEIR MANAGEMENT
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Date
2017-08-14
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The present investigation revealed eight insect pests on cowpea, namely stem fly
(Ophiomyia phaseoli Tryon), aphids (Aphis cracivora Koch), Leafhopper (Empoasca
kerri Pruthi), thrips (Megalurothrips sjostedti Tryb.), weevils, pod sucking bugs (Riptortus
pedestris Fab.), spotted pod borer (Maruca vitrata Geyer), blue butterfly (Lampides
boeticus Linnaeus) and termites. The major natural enemies recorded were coccinellids,
syrphids, green lace wing and spiders. Ten cowpea genotypes were screened for stem fly,
aphids and pod borers, of which KBC-2, KBC-8 and KBC-9 were found resistant to stem
fly and KBC-2, PGCP-13 were promising against aphids. Against pod borers, KM-5,
KBC-8, KBC-9, PGCP-3, PGCP-5, PGCP-6, PGCP-13 and IT-38956-1 were highly
resistant and KBC-2 and C-152 were moderately resistant. Among the insecticides
evaluated, imidacloprid 17.8 SL @ 0.30 ml/l (95.66 & 100 % protection), profenophos 50
EC @ 2 ml/l (92.45 & 99.83 % protection), chlorpyrifos 20 EC @ 2 ml/l (84.90 & 100 %
protection) and quinalphos 25 EC @ 2 ml/l (81.69 & 100 % protection) gave highest
protection against leafhopper and aphids, respectively. Least pod and seed damage was
observed in chlorpyrifos 20 EC @ 2 ml/l (8.88 & 9.00%) treatment, followed by
profenophos 50 EC @ 2 ml/l (13.33 & 14.33%). The maximum grain yield (11.20 q/ha)
and favourable B:C ratio ( 2) were evident from the plots treated with profenophos 50
EC, followed by chlorpyrifos 20 EC treated plots (11.10 q/ha and 1.98).
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