Control methods of rice leaf roller

Choose insect-resistant (insect-resistant) rice varieties, and apply fertilizers reasonably to make the rice grow healthily, so as to prevent off the charts in the early stage and late ripening in the later stage. Scientifically manage water, properly adjust the field shelving time, reduce the humidity in the field during the larval incubation period, or carry out deep-water irrigation for 2-3 days during the pupation peak period to kill insect pupae.

Protecting and utilizing natural enemies

Improve the natural control ability: There are more than 80 natural enemies of rice leaf roller in China, and all of them have parasitic or predatory effects. Protecting and utilizing natural enemy resources can greatly improve the control effect of natural enemies on rice leaf roller. There are about 80 natural enemies of rice leaf roller, which have parasitic or predatory effects in all stages. Parasitic natural enemies in egg stage, such as Trichogramma, Trichogramma oryzae, Trichogramma in larval stage, and predatory natural enemies, such as spiders and frogs, all have great control effect on leaf roller. According to the characteristics that rice is vulnerable to the damage of rice leaf roller at tillering stage and panicle stage, especially at panicle stage, the strategy of chemical control should be to treat the injured generation strictly at panicle stage and not relax the principle of serious damage to the generation at tillering stage. The application period of chemicals for controlling rice leaf roller should change slightly according to the residual effect of different chemicals. Pesticides with strong knockout ability and short residual effect should be applied 1-3 days after the peak of incubation, and pesticides with long residual effect can be applied 1-3 days before or after the peak of incubation. However, in actual production, the control of other pests and diseases should be flexibly combined. Reference practical drugs: 1, Darius (2 billion units of Helicoverpa armigera nuclear polyhedrosis virus, Jiangxi Zhengbang Biochemical Co., Ltd.) 2, Avastin Jin (5% avermectin EC, Shenzhen Nopuxin brand product), 3, Lesburn (48% chlorpyrifos EC, Dow Yinong), 4, 5% hexaflumuron EC, and 4, 5% hexaflumuron EC. 6. Kang Kun (3.2% avermectin microemulsion, Shandong Tiandao Bio-engineering Co., Ltd.) should pay attention to the rotation and mixture of drugs when using drugs. When using chemicals in different areas, please consult local plant protection technical experts.