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Pakistan Journal of Biological Sciences

Year: 2002  |  Volume: 5  |  Issue: 8  |  Page No.: 830 - 834

Forecasting Adult Populations of Helicoverpa armigera on Chickpea Using Pheromone Trap

Khalique Ahmed and Feeroza Khalique

Abstract

Chickpea pod borer, H. armigera infestation forecasting models revealed that 4th March ± 6 days, 13th April ± 4 days and 7th June ± 16 days were calculated to be the predicted dates for start, peak and end of trap catch populations respectively according to Calendar date method. Similarly, by Degree-day accumulation method, 181.2 ± 39.7, 480 ± 85.5, and 1379.6 ± 319.3 degree-days were calculated as to be the predicted degree-days for start, peak and end of trap catch populations respectively. In April 1999, insect peak population was seen on 14th April (fallen in agreement within the range of the calendar date model) and accordingly the plant protection measures were adopted.

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