International Journal of Chemical Studies
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P-ISSN: 2349-8528, E-ISSN: 2321-4902   |   Impact Factor: GIF: 0.565

Vol. 7, Issue 5 (2019)

Population dynamics of insect-pests of paddy and its correlation with weather parameters


Author(s): HR Sawai and RB Kothikar

Abstract: The research experiment discusses the population dynamics of paddy and its correlation with weather parameters in Zonal Agricultural Research Station, Sindewahi, Chandrapur district of Maharashtra. Occurrence and abundance of insect pests of paddy was monitored on rice variety PKV HMT during the season Kharif, 2014 with the spacing of 20 cm x 15 cm following the recommended package of practices. this investigation revealed that, the pest activity commenced from 29th Standard Meteorological Week and continued to 44th SMW. Highest dead hearts (6.77%) of yellow stem borer, Scirpophaga incertulas was found in the 44th SMW. The maximum population of armyworm (3.43 hill-1) was recorded in the 36th SMW, the peak population of cutworm (1.71 hill-1) was estimated in the 36th SMW. The highest per cent leaf damage due to leaf folder (15.63%) was found in the 40th SMW. The maximum population of Brown plant hopper (7.43 hill-1), WBPH (9.14 hill-1) were found in 44th SMW while green leaf hopper (3.86 hill-1) in 43rd SMW. The incidence of gall midge was not noticed. Yellow stem borer, BPH, WBPH, GLH and leaf folder positively correlated with maximum and minimum temperature, morning relative humidity while armyworm and cutworm positively correlated with rainy days, rainfall, Morning and evening relative humidity. Evening relative humidity, rainfall and rainy days discourages the population of yellow stem borer, brown plant hopper, WBPH, green leaf hopper and leaf folder but encourage armyworm and cutworm.

Pages: 21-23  |  820 Views  129 Downloads

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How to cite this article:
HR Sawai, RB Kothikar. Population dynamics of insect-pests of paddy and its correlation with weather parameters. Int J Chem Stud 2019;7(5):21-23.
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