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Author: Kavitha, S J × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Management of major sucking pests in cowpea vigna unguiculata (L.) Walp.with entom opathogens and plant defense inducing rhizobacteria
    (College of Agriculture, Vellayani, 2010) Kavitha, S J; KAU; Faizal, M H
    A study was conducted at the Department of Entomology, College of Agriculture, Vellayani during 2007-2009 to major sucking pests in cowpea Vigna unguiculata (L.) Walp. with entomopathogens and plant defense inducing rhizobacteria.All PGPR screened viz., Pseudomonas putida, Pseudomonas sp., Bacillus subtilis, Bacillus pumilus and Serratia marcescens significantly enhanced seedling vigor in cowpea. Seed treatment with PGPR gave superior results over soil drenching and foliar application. Population build up of A. craccivora was slow in PGPR treated plants compared to control. B. subtilis, B. pumilus and S. marcescens were identified as potential PGPR suited for growth promotion and aphid suppression in screening experiment in glass house.Fusarium pallidoroseum and S. marcescens proved very effective entomopathogen against A. craccivora and R. pedestris respectively showing consistently higher mortality with increase in exposure time. B. bassiana and M. anisopliae were found moderately effective.In dual culture plate assay, all PGPR were compatible with each other, Among the entomopathogens, M. anisopliae inhibited growth of F. pallidoroseum strongly. In combination of PGPR and entomopathogens, B. subtilis, Pseudomonas sp. and P. putida strongly inhibited the growth of M. anisopliae. In pot culture studies, B. subtilis was the best PGPR treatment in enhancing the biometric characters and yield of cowpea.F.pallidoroseum gave maximum per cent mortality of A. craccivora. B. subtilis applied in combination with F. pallidoroseum was effective in suppressing aphids and increasing the yield. Dual application of B. subtilis and S. marcescens against R. pedestris resulted insignificantly higher yield. Combined infestation of A. craccivora and R. pedestris could be managed by seed treatment with B. subtilis followed by application of F. pallidoroseum and S. marcescens.