Rice leaf miner, Hydrellia griseola fallen, is a major pest of rice production region in Jilin province. Damage occurs almost every year in some locations. It passed in the adult stage in the winter. The larvae of Ist-brood caused most injury to transplanted rice seedlings, Peak egg deposited by overwintered female flies generally occurred from the late May to early June, and the larvae were most numerous in early June and attacked the rice seedling leaves.
In 1985, we compared the effect of ten insecticides against rice leaf miner in field plots. Only granular phorate provided excellent effect. In 1986. largescale field tests with granular phorate were conducted in Yongji Jiutai, Tongfeng, Hailong, Panshe, and Tonghua. All test results demonstrated that the most effective insectide was phorate as 5% granular at rate 3.75 to 7.5okg/ha spread immediately into water during 1 to 5 June, Keep water of rice field must steady for a week. It reduced larvae population exceeding 95%. It is recommened as a measure in the rice pest management program.