Effect of temperature, rainfall and relative humidity on seasonal incidence of major rice insect pests
Paper Details
Effect of temperature, rainfall and relative humidity on seasonal incidence of major rice insect pests
Abstract
An experiment was carried out under field conditions at the Bangladesh Rice Research Institute, Regional station Sonagazi, Feni, to determine the effect of abiotic factors on the seasonal incidence of major rice insect population at the south-east coastal region of Bangladesh during T. Aman, 2019. Insects were collected from the experimental plot by using the sweep net method and weather data was recorded simultaneously from the meteorological observatory. The highest percent of dead hearts (10.51) and white heads (9.38) occurred during the 2nd week of October and the 1st week of November, respectively. The correlation studies with abiotic factors revealed that temperature and rainfall showed a negatively significant impact on the population of S. incertulas (white heads) but rainfall showed a positive non-significant impact on the dead heart. Temperature and relative humidity both showed a negatively non-significant impact on dead hearts and white heads respectively but relative humidity showed a positive significant impact on dead hearts. Leaf folder infestation attained its peak during the 2nd fortnight of October and didn’t get significantly affected by rainfall, relative humidity annd temperature. Green leaf hopper attained peak population during October-November. GLH showed a negatively significant correlation with minimum temperature, while it was not significantly affected by other weather parameters viz, maximum and average temperature, rainfall and relative humidity. Rice bugs have a negative non-significant effect with relative humidity and temperature but a negatively significant effect with rainfall. These findings will be helpful for proper and timely management of the major rice insect pests in the south-east coastal region of Bangladesh.
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