In recent years, the occurrence of rice stem borers, including Chilo suppresalis and Scirpophage incertulas, Sesamia inferens, has gradually increased in the northern Taiwan. The chemical screening test in the paddy field showed that the application of 6 % Cartap Granules with 30 kg/ha and 3 % Furadan G. with 60 kg/ha could give the best control against rice stem borers. Application of 6 % Cartap G. at rate of 30 kg/ha at different rice growing stages showed that application at 25 days after transplanting would give the best control against rice stem borers. A varietal screening test showed that Taichung Sen 10 was most susceptible to rice stem borers.
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