EFFECTIVENESS OF SOME INSECTICIDES AGAINST CABBAGE APHID, BREVICORYNE BRASSICAE (LINNAEUS) (APHIDIDAE: HOMOPTERA)

Abstract

Efficacy of Confidor (imidacloprid) 200 SL @ 100 ml ha-1, Endosulfan (endosulfan) 35 EC @ 1500 ml ha-1, Advantage (carbosulfan) 20 EC @ 750 ml ha-1, Polo (difenthiuron) 500 SC @ 500 ml ha-1 and Trebon (ethophenprox) 30 EC @ 500 ml ha-1 was studied against cabbage aphid, Brevicoryne brassicae (L.) during February 2000 on pointed-head Chinese cabbage (Brassica rapa cv. gr. perkinensis) and round-head cabbage (Brassica oleracea var. capitata). All tested insecticides controlled the aphids effectively on both the crops, however Confidor, Endosulfan and Trebon application resulted in better control on pointed-head Chinese cabbage. On round-head cabbage, Trebon proved better than other insecticides. Maximum control of aphid was observed three days after application of all the insecticides on pointed-head Chinese cabbage and majority of the insecticides on round-head cabbage. Number of aphids started increasing in all treatments except that in Trebon after three days of application in round-head Chinese cabbage. When no insecticide was applied, increase in aphid population was 4.5 and 3.1 times the initial population within seven days in plot of round-head cabbage and pointed-head Chinese cabbage, respectively.