Pest Succession and Management of Shoot and Fruit Borer, Ear/as Vittella {fab.) on Okra

Abstract

The present investigation entitled 'Pest succession and management of shoot and fruit borer, E. vittel/a (Fab.) on okra' was conducted at Crop Research Centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut during kharif 2010. The experiment comprised of ten treatments laid out in randomized block design (RBD) with three replications. During the crop season, fifteen insect species were recorded associated with the okra crop. Among them, okra shoot and fruit borer, Earias vittella Fabricius, was recorded as major pest. The fruit borer, (Helicoverpa armigera Hub.), leaf roller (Sylepta derogata Fabricius}, green semilooper (Anomis flava Fabricius), pink bollworm (Pectinophora gossypiella Saunders), white fly (Bemesia tabaci Gennadius), cotton jassid (Amrasca biguttula biguttula Ishida), green stink bug (Nezara viridula Linne), red cotton bug (Dysdercus cingulatus Fabricius}, dusky cotton bug (Oxycarenus Jactus Kirby}, cotton aphid (Aphis gossypii Glover), cotton thrips (Thrips tabaci Lindeman}, blister beetle (My/abris pustulata Thumb), termite (Odontotermes obesus Romb) and grasshopper (Chrotogonus sp) were found moderately damaging the crop. Among all the treatments novaluron 10 EC @ 750 ml/ha was found most effective against shoot and fruit borer, E. vittella in okra with minimum shoot and fruit damage followed by carbosulfan 25 EC @ 1000 ml/ha, bifenthrin 20 EC @ 500 ml/ha, triazophos 40 EC @ 1 000 ml/ha, methomyl 40 SP @ 1 000 ml/ha, phenthoate 50 EC @ 1000 ml/ha, cypermethrin 25 EC@ 1000 ml/ha, neemarin 1500 ppm@ 3000 ml/ha and B. thuringiensis @ 1500 g/ha. The maximum shoot and fruit damage was recorded in untreated control. The highest yield (98.21 q/ha) and higher cost benefit ratio (14.69) were obtained from the nova luran 10 EC @ 750 mllha followed by carbosulfan 25 EC @ 1000 mllha, bifenthrin 20 EC @ 500 mllha, triazophos 40 EC @ 1000 ml/ha, methomyl 40 SP @ 1 000 ml/ha, phenthoate 50 EC @ 1 000 ml/ha, cypermethrin 25 EC @ 1 000 mllha, neemarin 1500 ppm @ 3000 ml/ha and B. thuringiensis @ 1500 g/ha with the yield of 86.54, 82.55, 79.15, 76.45, 7 4.93, 70.85, 65.35 and 63.55 q/ha and cost benefit ratio of 12.40, 11.37, 1 0.50, 9.15, 8.88, 7.48, 4.16 and 1.17, respectively.