What pesticide has a good control effect on rice yellow leaves

There are many causes of yellow leaves in rice, and only after finding the cause can the right remedy be applied. What pesticide to use for rice yellow leaves is better?

What pesticide to use for rice yellow leaves

There are many causes of yellow leaves in rice, and the cause must be found before the right remedy can be applied.

1. A deficiency of elements during rice growth usually causes the leaves to turn yellow. For example, when rice lacks potassium fertilizer, brown spot and red spot disease often occur, mostly from the mid-tillering stage to the heading stage of rice, when the tips and edges of old leaves turn from yellow to brown, and irregular brown spots appear. With magnesium deficiency, the color between the veins at the leaf tips and edges first becomes chlorotic, then fades from pale to yellow. With sulfur deficiency in rice, the main feature is loss of green color and yellowing. The solution is foliar spraying of potassium sulfate and magnesium sulfate.

2. Rice leaves infected with rice leaf blast have leaf tips and leaf margins that wither and turn yellow, with a brown necrotic line running through the center of the lesion. At the early stage of the disease, use 22 grams of 75% wettable powder per mu, mix with 30-50 kg of water, and spray on the leaves. Not only this disease, but other bacterial diseases can also cause yellow leaves in rice, such as bacterial leaf blight and damping-off, and the pesticide needs to be applied according to the specific condition.

3. If rice leaves turn yellow due to pesticide damage or fertilizer damage, plant growth regulators such as brassinolide, gibberellin or induced resistance agents can be sprayed on the leaves to alleviate the pesticide damage, repair the damage to rice from pesticides and fertilizers, and restore normal rice growth.

4. When rice leaf tips are damaged by thrips, planthoppers, the newly hatched larvae of stem borers, and the like, the leaf tips turn yellow or wither yellow. Use 25-30 grams of 25% buprofezin powder per mu, mix with 50 kg of water, and spray on the leaves. Imidacloprid, acetamiprid, thiamethoxam and other pesticides can also be used. If one control application is not ideal, multiple control applications can be made at intervals of ten days to half a month.

Overall, only by finding the specific cause of the disease can remedial measures be found in time and the rice grow better.