Population dynamics of Helicoverpa armigera with pheromone traps in relation to weather parameters in pigeonpea
Keywords:Pigeonpea, Helicoverpa armigera, pheromone traps, weather factors, correlation.
AbstractThe field experiments on population dynamics of Helicoverpa armigera with pheromone traps information in pigeonpea at the International Crops Research Institute for Semi-Arid Tropics (ICRISAT) Hyderabad, during 2016-2017 and 2017-2018. During 2016-17 results revealed that the adult moth population of H.
armigera was first time appearing in the field during 22th std. week (June 1st to 3rd) with (1.20 moths/5trap/ week). H. armigera moths population increased on 34 and 35 SMW (13 to 14 moths/5trap/week) respectively, it was associated with maximum and minimum temperature were ranged from 29.3oC to 31.9oC and 23.4oC to 24.1oC respectively along with 85% morning relative humidity 57.7 to 64.9% evening relative humidity. The population abruptly decreased to 2.91 during 36 std. week there after moth population remained more or less static throughout the cropping season. During 2017-18 the peak activity of H. armigera adult moth population appeared on 35 SMW (3.80 moths/5trap/week), and was associated with maximum and minimum temperature were ranging from 29.3oC to 21.9oC respectively along with 91.4% and 71.6% morning and evening relative humidity respectively. A non-significant correlation existed between adult moth and the maximum and minimum temperature with (r =-0.214) and r=0.21 respectively. While morning relative humidity, evening relative humidity and rainfall showed significant positive correlation (r = 0.263, 0.363 and 0.532 respectively) with H. armigera moth populations.
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