Rice insect pest population dynamics (Gintong Ani Program)
2001
Mangoba, P. | Comeflo, R. | Lizarondo, R. | Tenorio, A. (Department of Agriculture, Diliman, Quezon City (Philippines). Regional Crop Protection Center)
The study was conducted to determine the insect pests and natural enemies of the different rice varieties when grown on farmers' field. Likewise, the insect population in relation to the fertilizer used by the farmers was determined. Results of the study of the different rice varieties in both wet and dry seasons exhibited varying degree of differences in their reactions to insect pests and natural enemies. While the PSB RC20, PSB RC 30, PSB RC 32, and PSB RC 34 showed certain degrees of resistance to insect pests, farmers' varieties IR64, IR60, and IR42 were visibly affected by insect pests. The maximum number of insect pests and natural enemies always occurred during the reproductive stages. Environmental factors like temperature, relative humidity, and rainfall played important roles in affecting pest population. The maximum number of insect pests and natural enemies occurred at 36, 43, and 50 days after transplanting but decrease as the rice plants approached the ripening stage
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