First, what happened:
According to my station on July 8-13, surveys were carried out in Daguan, Xinglong, Nanping, Shuijiang, Nancheng and Dongcheng townships (streets). The leaf generation rate of field generation was 0-1.2%, with an average of 2.4%. In the field, moths were mothed, and the amount of mu was 60-1200 heads, with an average of 256.8 heads, which was higher than in recent years. There was more precipitation in recent days, and the amount of rice insects in the rice leaf roller was larger. At present, most fields of rice are in the heading stage, and the partial application of nitrogen fertilizers is green and green, which is beneficial to the occurrence of rice leaf roller. Since the recent amount of insects infested with fieldworms has occurred one after another, and the difference between fields has occurred. Generational overlap is more serious and it is expected that the peak period of damage will be extended to July 20-28. The agricultural service centers in Xige Township (township and subdistrict offices) must strengthen field inspections, grasp fine weather, and guide farmers to scientifically formulate medications.
Second, prevention time and key fields:
Prevention time: July 18-25. The use of greener plots, partial application of nitrogen fertilizer plots, and a type of seedling plots were the focus of prevention and control.
Control indicators: 35-45 insects per hundred clumps.
Third, control methods
1. Use 10% Avi for Mu. Fluoroamide 20-30 ml.
2. Mu with 6% lutetium (chlortetrabenzamide, avermectin) 40 ml.
The above formula, when the insect is larger, add 5% avermectin 100 ml or 3% adithiocarbamide 100 ml. Add 60 kg of water in a regular spray or add 7-10 kg of motorized spray. The effect of controlling rice leaf roller is better.
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