Devendra PrasadSanjay Kumar Bhagat2024-07-022024-07-021997https://krishikosh.egranth.ac.in/handle/1/5810211314Field experiment was carried out at the pulses section of Birsa agriculture university , Kanke Ranchi during Kharif season to ascertain the succession and population bulid up of insect pests as infleuenced by biotic and abiotic factors and to derermine the influenced of carbofuran 3 G and cropping system on the pest complex of Gomati variety of cowpea,vigna unuiculata(L) walp. Eighteen insect pests observed on cowpea at different stages of crop growth.Of these leafhopper, Amrasca Kerri pruthi; aphid, Aphis craccivora Koch; leafminer, Acrocercops phaespora meyr;semilooper, Anomis flava fab. And pod borer complex viz Maruca testulalis (Geyr) Euchrysops cnejus (Fab), Lampides boeticus L. and Helicoverpa armigera (Hub) were consider to be major pests. Three groups of predators namely spiders unidentified ,lady bird beetle,, coccinella septempunctata L and black ant, Acantholepis simplex forel. Were found to be associated with the insect pests of cowpea regulating the pest population build up. A temperature range between 20.5degree C-22.5 degree vc (minimum) and 29.4degree c -30.2dgree c (maximum) during preceding week under the influence of rainfall favored the highest population densities of leafhopper ,A Kerri aphid, A. craccivora leafminer, A phaeospora and semilooper A. flava. Application of carbofuran 3G at the rate of 0.5 kg a.i. per hectare exercised 3-feld impact by accelerating the plant height, minimizing the incidence of insect peats and increasing the crop yield. Intercropping of gora paddy(BR-23-19)and marua (A-404) brought about considerable suppressing effect on the incidence of the most of the insect peats associated with cowpea. Cowpea was responsible for producing 4.10 quintal per hectare additional yield through intercrop of marua (4:1) when the yield of cowpea is added with marua yield after conversion.EnglishThesis