Abstract
Effect of abiotic factors on the population dynamics of brown plant hopper (BPH), Nilaparvata lugens (Stal) and white-backed plant hopper (WBPH), Sogatella furcifera (Hovarth) was studied. BPH population appeared during 30th standard week and reached to its peak during 40th standard week. However, the incidence of WBPH commenced from 32nd standard week and attained peak population levels during 40th standard week. The correlation analysis showed that BPH population has significantly positive correlation with morning RH, evening RH and average RH. Further non-significant positive correlation with minimum temperature, maximum temperature, average temperature and a non-significant negative correlation with rainfall was observed. The correlation analysis of certain abiotic factors with WBPH revealed that the population also showed positive significant correlation with average RH and a positive non-significant correlation with evening RH, morning RH, maximum temperature, minimum temperature and average temperature. However, the population showed negative non significant correlation with rainfall.
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