Study on the forecasting of major rice insect pest occurrences
1995
Suwat Ruay-aree (Department of Agriculture, Bangkok (Thailand). Div. of Entomology and Zoology)
Results showed that the green leafhopper, Nephotettix spp., was the most abundant. More than 50 percent of rice insect pest caught in light trap was the green leafhopper. The rice stemborer was found abundant during January to March of average temperature 22.9 deg C in dry condition. Leafhopper and planthopper were abundant during September to December of average temperature 24.5 deg C in dry to wet of rain condition. Rice gall midge was abundant during September to October of average temperature 25.5 deg C in dry to wet of rain condition. In dry season crop, rice stemborer was found to be a key pest. The infestation of rice stemborer in RD1 and RD23 fields was mostly above economic threshold level (ETL) (10 percent). High infestation was found in no rainfall condition. In wet season crop, rice gall midge was a key pest. The infestation was above ETL (5 percent) every year and high infestation was found in slight to heavy rain condition. It was found highly significant positive correlation between the number of rice gall midge in light trap and its infestation in rice field. The green leafhopper was also abundant in the field in wet season crop and its numbers in light trap and in rice field was found highly significant positive correlation in the experiment. So, light trap could be utilized in forecasting of rice gall midge infestation and green leafhopper occurrence in rice field.
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