Larval fluctuation of Helicoverpa armigera with reference to environmental factors in chickpea crop

Abstract

A field experiment was conducted during rabi season of 2017-18 entitled “Larval fluctuation of Helicoverpa armigera with reference to environmental factors in chickpea crop.” in sandy loam soil of Narendra Deva University of Agriculture & Technology, Narendra Nagar (Kumarganj), Ayodhya (U.P.). The experiment consisted of nine treatment combinations comprised three varieties and three date of sowing viz., sowing on Nov. 5th with temperature 23.8oC, Nov 15th with temperature 20.8oC and Nov. 25th with temperature 16.8oC and three varieties Uday (V1), Pusa-362 (V2) and Radhey (V3). Results reveal that the all three varieties under three date of sowing Peaks larval population of pod borer were recorded during 8th to 9th standard week. Highest larval population (5.50 larvae/plant) was recorded in crop sown at November 25th followed by November 15th sown crop while lowest in sown on November 05th, larval population increased with increase in temperature, maximum temperature from 25oC to 35oC increases the larval population, while minimum temperature from 10 oC to 14 oC indicate that larval population increased with increase in minimum temperature in all varieties.