Population Dynamics of Helicoverpa armigera on Soybean
DOI:
https://doi.org/10.55446/IJE.2022.590Keywords:
Helicoverpa armigera, infestation, incidence, relative humidity, temperature, rainfall, sunshine hours, correlation coefficients, seasonal incidenceAbstract
This study on the population dynamites of pod borer Helicoverpa armigera (Hubn.) on soybean revealed that it appeared from 29sup>th</sup> Standard meteorological week (SMW) (0.40± 0.10 three leaves/ plant). It increased and reached its peak level of 2.67± 0.17/ 3 leaves/ plant during 33rd SMW. The declining trend was observed and reached 0.60± 0.13/ 3 leaves/ plant during 40<sup>th</sup> SMW. The peak infestation was 48% during 35sup>th</sup> SMW. The incidence exhibited non-significant positive correlation with maximum (r= 0.227) and minimum temperature (r= 0.335) and evening relative humidity (RH) (r=0.315); and a significant positive one with morning RH (r= 0.599) and significant negative one with rainfall (r= -0.42). The sunshine was found to be negatively and non-significantly correlated (r = -0.069).
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