Efficacy of some insecticides against whitefly and aphid on cabbage crop

Homogenous, seedling of cabbage was planted on well prepared ridges keeping a 60 x 30 cm inter and intra row distance. There were twenty plots each plot have an area of 15x10 meter. Every plot was replicated four times. For insecticides namely proclaim at 200ml/acre, Match 200ml/acre, Confidor at 100ml/acre, and Mospilon at 100ml/acre were supplied twice and compared with untreated control. Each spray was practiced at fortnight interval during morning hours. For this purpose a hand operated knapsack sprayer was used. Before spray of each insecticide spray tank was washed carefully to avoid admixture. Pretreatment observation on aphid and whitefly was recorded one day before each spray and 24, 48 and 72 hours and one week after each spray. For this purpose 5 plants were selected randomly from each sub-plot and tagged. Three leaves from each selected plant were examined carefully and their average was workout to see the efficacy of insecticides reduction percentage was calculated. It was observed that all the insecticides tried reduced aphid Lipaphis erysimi population after 24, 48 and 72 hours and one week of each spray. However, the differences in reduction %age between the insecticides were significant at 1 percent level of probability when recorded after 24, 48 and 72 hours and one week of each spray. It was further observed that Proclaim at 200ml/acre resulted in maximum control of aphid (78.94%) during 1st spray and (79.85%) in 2nd spray followed by Match 200ml/acre (72.12%) 1st spray and (73.41) 2nd spray and Mospilon at 100ml/acre (69.99%) 1st spray and (70.14%) during 2nd spray respectively. However, Confidor at 100ml/acre was less effective (63.82%) 1st spray and (65.31%) 2nd spray. The mean reduction %age of aphid revealed that Proclaim at 200ml/acre displayed greater reduction of aphid (79.40%), followed by Match 200ml/acre (72.77%) and Mospilan at 100ml/acre (70.07%) respectively, while Confidor at 100m l/acre recorded lowest reduction of aphid (64.57%). The results for reduction %age of whitefly Bemisia tabaci indicated that all products reduced population of pest, however, differed significantly among the insecticides when recorded after 24, 48 and 72 hours and one week of each spray. The results further revealed that among the four insecticides evaluated Proclaim at 200ml/acre caused significantly maximum reduction of whitefly (77.71%) during 1st spray and (78.56%) in 2nd spray, followed by Match 200ml/acre 77.89%) 1st spray and (74.19%) in 2nd spray and Mospilan at 100ml/acre (65.17%) 1st spray and (71.35%) 2nd spray respectively. Whereas, Confidor at 100ml/acre recorded minimum reduction of pest (58.85%) 1st spray and (71.35%) 2nd spray. On average, it was observed that Proclaim at 200ml/acre proved to be effective against whitefly on cabbage crop caused greater reduction of whitefly (78.14%), followed by Match at 200ml/acre (76.02%) and Mospilan at 100ml/acre (68.26%) respectively, while confidor at 100ml/acre was less effective against whitefly (62.42%). It is concluded that among the four insecticides evaluated against two sucking pests of cabbage (aphid and whitefly) Proclaim at 200ml/acre found to be effective and reduced greater population of aphid and whitefly during both of spray on cabbage crop.