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Field studies on pheromone trap catches of Helicoverpa armigera Hubn.: I. Monitoring seasonal abundance and larval infestation on chickpea and the effect of climate on trap catches



Field studies on pheromone trap catches of Helicoverpa armigera Hubn.: I. Monitoring seasonal abundance and larval infestation on chickpea and the effect of climate on trap catches



Indian Journal of Plant Protection 20(2): 149-157



The monitoring of the male Helicoverpa (Heliothis) armigera Hubner was carried out from January 1986 to May 1989 at the IARI Regional Station, Karnal (Haryana (India)), using sex pheromone baited traps. Maximum activity was recorded during the spring/summer season (6th to 28th std. week) while a minor peak activity was also observed in autumn (42nd to 50th std. week). Pattern of trap catches indicated occurrence of 4 to 5 generations in a year. Moth catches in pheromone traps were found to be positively correlated with the larval counts of H. armigera on chickpea made after 1, 2 and 3 weeks of trap catches. Of various weather parameters, mean air temperature and relative humidity significantly influenced the moth catches. Average air temperature of 13.2 degree C or a relative humidity of 80.3% were required to get at least one catch of moth in a week.

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