Hazard symptoms and control methods of rice stem borer

Rice stem borer, also known as borer, can be harmed from tillering to maturity, which poses a threat to rice production. It can be reduced by 5% to 10% when it occurs, and can be reduced by more than 30% when it occurs seriously. Rice yield.
I. Hazard Symptoms The mites are omnivorous pests. The larvae are first clustered in the leaf sheath to damage the internal tissues of the leaf sheath. After the 3rd instar larvae, the stalks begin to damage. The rice is damaged in the tillering stage, biting off the heart leaves and causing the dead seedlings and the dead sheath; at the booting stage and at the heading stage, there are white spikes and dead ears; in the filling stage and the milk ripening stage, the half-eared ears and the insect-injured strains are caused. Easy to fold.
Second, the prevention and treatment methods 1, the use of 20% Avi chlorpyrifos EC or 0.2% A vitamin salt 40 ml on water 50 kg conventional spray or water 8 kg motor spray.
2, 18% insecticidal double water agent 150-200 ml per acre, sprayed with water. The whole rice is used for 3 to 5 times during the growth period (interval 7-10 days).
3, with 5% Ruijin special suspension agent 30-40 ml per mu, 40-50 liters of water spray, the efficacy period can be as long as 20-30 days. The above-mentioned various methods can maintain a 3 to 5 cm shallow water layer for 3-5 days during the application period, which can improve the control effect.
3. Cultivation measures Deep-water irrigation: When the eggs of the sorghum sorghum begin to hatch, the rice fields are drained, and the leaf sheaths of the ants are reduced. After the peak of the hatching and at the end of the incubation period, the deep water is once filled, and the leaf sheaths are submerged for 2-3 days. Kill a large number of ants; reduce the water level before starting, and deep water after the simmer, can also kill a large number of worms.