MANAGEMENT OF INSECT PESTS IN POTATO BY SOME INSECTIDES AND MULCHING

Abstract

The experiment was conducted to study the effect of different insecticides in controlling the major potato insect pests (jassid, aphid & cut worm) in potato respective to mulching from October 2015 to April 2016. The potato variety "Golden" was used as the test crop. The experiment consisted of six insecticidal treatments [T1= Furadan 5G @ 9g/plot (soil application) + Carbaryl (Sevin 85WP) @ 2.0g/L (Foliar application), T2= Furadan 5G @ 9.g/plot (soil application) + Imidachloprid (Admire 200SL) @ 1.0ml/L (Foliar application) , T3= Chlorpyriphos (Darsban 20EC)@ 2.0ml/L (soil + Foliar application) + Water hyacinth (Mulching), T4= Diazinon 10G @ 5g/plot (soil application) + Lamda Cyhalothrin (Alion 2.5 EC) @ 1.0ml/L (Foliar application) + Straw (Mulching), T5= Diazinon 10G @ 5g/plot (soil application) + Thiamethoxam (Voliam Flexi)@ 1.0ml/L (Foliar application), T6= Chlorpyriphos @ 2ml/L (soil application) + Es-fenvalerate (Sumi Alpha 5EC) @1.0 ml/L (Foliar application) + Water hyacinth (Mulching) ] along with a untreated control treatment (T7). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. In case of controlling aphid, significant highest infestation reduction (92.51%) was obtained from T1 (Furadan 5G with Carbaryl ) and lowest (73.69%) from T4 ( Diazinon 10G with Lamda Cyhalothrin). In case of controlling, jassid population, highest infestation reduction (94.83%) was recorded in T1 (Furadan 5G with Carbaryl) and lowest infestation reduction (87.09%) in T6 (Chlorpyriphos with Es-fenvalerate). In controlling cutworm, T4 (Diazinon 10G with Lamda Cyhalothrin) showed best performance (77.78%) followed by (82.22%) in T5 ((Diazinon 10G with Thiamethoxam) treatment . The lowest reduction in cutworm population (46.77%) was found in T2 (Furadan 5G with Imidachlorpid). Highest yield was observed in T5 treatment (Diazinon 10G with Thiamethoxam). Lowest number of cutworm infestation in potato tuber was recorded as 6.66% and 8.74% in T5 (Diazinon 10G with Thiamethoxam) and T4 (Diazinon 10G with Lamda Cyhalothrin ) treatment respectively .