EFFECTIVENESS OF SOME CHEMICALS AND BOTANICALS AGAINST JASSID (Amrasca biguttula biguttula Ishida) OF BRINJAL AND THEIR IMPACT ON SPIDERS AND LADY BIRD BEETLES

Abstract

To evaluate the effect of some chemicals and botanicals on jassid, Amrasca biguttula biguttula Ishida in brinjal and their impact on spiders and lady bird beetles. a field experiment was conducted at the experimental farm of Sher-e-Bangia Agricultural University. Dhaka during February to August 2007. The experiment comprised nine treatments viz. irnidachloprid 200 SL. cypermethrin 10Ee. carbosulfan 20EC, thiarnethoxarn 25WG. neern seed kCI11e1.neern oil combined with trix, trix, mahua leaf extract and an untreated control. It was laid out in a randomized completely block design with 3 replications. The lowest population of adult (2.36 plane' at vegetative stage and 9.80 plant" during fruiting stage) and nymph (0.73 plant" at vegetative stage and 1.67 plant" during fruiting stage) was observed in carbosulfan treated plots. which gave the maximum protection of brinjal against jassid attack by reducing pest population. Among the botanicals tested, neern oil in combination with trix, and neern seed kernel showed satisfactory control ofjassid on brinjal. Trix and mahua leaf extract reduced the infestation of jassid in comparison with control but their effectiveness was not satisfactory. Carbosulfan, imidachloprid and cypermethrin reduced more than 80% population of spiders and lady bird beetles.