Yield loss assessment and monitoring of Helicoverpa armigera Hubner in chickpea under Chitwan condition (original) (raw)

Abstract

Chickpea pod borer, Helicoverpa armigera Hubner is an economically important pest of various crops in Nepal. A study was conducted in Chitwan to monitor and estimate yield loss caused by this borer in chickpea in 2004/05. Sex pheromone trap monitoring was also carried out during the winter season 2005/06 at farmer’s field in two locations. The peak moth catch was recorded during second week (91 male moths) at Rampur and third week (42 male moths) of March at Fulbari. Pod damage and larval infestation were recorded in four consecutive weeks of pod setting stage. Pod damage (31.97%) and number of larvae/plant (3.10) were found the highest at 129 days after sowing (DAS) with a positive correlation (r = 0.61) between number of larvae and percent pod damage. The results are discussed in relation to its implications in pest management during prevailing weather condition of Chitwan, Nepal.

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