Methods and Technical Key Points for Controlling Rice Pests and Diseases in the Mid-to-Late Stage
This year's rice insect pests are mainly migratory and boring pests, with an estimated affected area of 730 million mu-times. With multiple pests and diseases jointly affecting mid-to-late stage rice, experts recommend using a combination of agroecological control techniques and chemical control measures.
Agricultural and ecological control techniques: After rice transplanting and seedling recovery until before heading, use the rice-duck co-cultivation method for control, which can achieve the effects of weed control, disease prevention and pest control; at the same time, in fields affected by viral disease, promptly pull out infected rice plants or tread them into the mud, split tillers and replant seedlings, and in severely affected fields promptly plow and replant with other crops.
Chemical control techniques: For controlling rice planthoppers, use pesticides such as buprofezin (pymetrozine), etofenprox, and pymetrozine; if the field has no water at the yellow-ripe stage and rice planthoppers break out severely, dichlorvos poisoned soil fumigation may be used; for controlling rice leaf roller, use methods such as profenofos and chlorantraniliprole; pesticides such as bisultap and monosultap can be used to control the greater rice stem borer. During the growth period of mid-late rice, temperatures are high and sunshine is abundant, so field operations should be carried out in the early morning and evening, avoiding pesticide spraying at noon under high temperatures, and personnel protection should be well managed to avoid pesticide poisoning accidents.
In addition, panicle blast is the focus of chemical control, and protection should be strengthened at the initial booting stage and full heading stage, with proactive spraying 1-3 days before booting, and one should not leave it to chance. Afterward, combine with meteorological conditions; if meteorological conditions are suitable, apply once more in the early grain-filling stage. At the same time, applying pesticide before rain gives better control effects; you may use 80-100 grams per mu of isoprothiolane, or 25-30 grams per mu of 75% Daoyan (tricyclazole) and other pesticides for control; if continuous overcast and rainy weather occurs, also seize the gap when the rain stops to apply control.