Vector virus relationship and development of organic package for management of chilli Cv Byadagi pests

Abstract

Investigations on the establishment of vector chilli virus relationship, effect of newlineorganic soil amendments on the activity of pests of chilli, development of spray schedule newlineinvolving biorationals, studies on the tritrophic interactions involving chilli cultivars, newlineHelicoverpa armigera and Trichogramma species and evaluation of IPM modules carried out newlineduring 2004 and 2005 at the MARS, UAS, Dharwad. newlineVector-virus relationship revealed that among the insects, only aphids, Aphis gossypii newlineand Myzus persicae were able to transmit the virus from diseased to healthy seedlings and newlinevirus was identified as poty virus. However, thrips, mites and whitefly failed to transmit the newlinevirus from diseased to healthy seedlings, in the current study. newlineTritrophic relationship studies indicated that, Byadagi Kaddi was the more preferred newlinehost for oviposition by both H. armigera and Trichogramma species and Tejashwini cultivar newlinewas least preferred host. T. chilonis was found to be the most potential in parasitising H. newlinearmigera eggs, irrespective of the cultivars. newlineSplit application of neem cake at 125 kg/ha + vermicompost at 625 kg/ha at newlinetransplanting and 50 days later (with 50 per cent nitrogen) and nimbecidine and NSKE spray newlineinterventions later was found to be the most effective against chilli pests. Organic newlineinterventions were found safe to natural enemies. newlineThe treatment schedule with nimbecidine (four times) and a spray of vertimec was newlinefound to be effective against sucking pests. Where as, nimbecidine-nimbecidine-spinosad- newlineGCKE - spinosad treatment was effective versus H. armigera. Predator s activity was normal newlinein the biorationals treated plots. Module-I, comprising of marigold trap crop, vermicompost 2.5 newlinet/ha, neemcake 250 kg/ha (without application of RDF), superimposed with neemazal 5 WAT, newlineDiafenthiuron 8 WAT, profenofos 11 WAT and neemazal 14 WAT, was found to be the most newlineeffective module against chilli pests. All IPM modules were found safe to predators in crop newlineecosystem.