Biology of Cotton Leafhopper and Efficacy of Insecticides for Controlling in Purple Eggplant

Abstract

Biology of cotton leafhopper, Amrasca biguttula biguttula (Ishida) (Hemiptera: Cicadellidae), and efficacy of some insecticides for its control were carried out at Faculty of Agriculture, Chiang Mai University.  The cotton leafhoppers were reared on purple eggplants in cages under screen house at temperature of 27.80 ±0.90^ºC and relative humidity of 59.32 ±1.35%.  The mean duration of incubation period and first to fifth instar nymphs of cotton leafhopper were 6.50 ±0.50, 1.60 ±0.53, 1.30 ±0.47, 1.25 ±0.44, 1.40 ±0.50 and 1.65 ±0.478 days, respectively. The total nymphal period was 7.55 ±2.06 days.  The total life cycle from egg to adult emergence was 21.95 ±1.05 days. The adult male and female longevities were 23.40 ±2.13 and 25.55 ±2.39 days, respectively.  The efficacy test of chemical insecticides, botanical insecticides and bioinsecticides were conducted in laboratory condition using completely randomized design (CRD) with 3 replications. The result showed that abamectin, carbaryl and cypermethrin insecticides were the most effective insecticides for controlling the third instar nymphs of cotton leafhopper with 100.00% of mortality while Metarhizium anisopliae as abioinsecticide was high affected with of 83.33% mortality.