Prevention and Control of Rice Blight
Symptoms: It is a physiological disease that occurs mostly at the beginning of rice tillering, and it reaches the peak of occurrence at the time of childbirth. The erythromycin spots of different sizes appeared on the leaves of the diseased plants, and they aggregated into plaques or strips when severed. Spots first appeared at the tip of the lower old leaves, then gradually turned reddish-brown downwards, and finally the whole leaves withered, while the upper leaves spread, and only a few new leaves of the whole plant remained green and looked far like a fire-like sample. Roots are brownish, mixed with black roots, rot roots, and short.
Control measures: 1. Improve the soil structure of rice fields. Deepen the soil tillage layer, and the straw returns to the field to improve soil aggregate structure and enhance soil permeability. 2, strong rice water and fertilizer management. After transplanting rice, shallow water irrigation will be carried out, and crops will be air-conditioned in due course. In particular, paddy field where straw is returned to the field should be ventilated in time for gas exchange to remove toxic gases in the field. Timely application of manure, regulating fertilizer, panicle fertilizer, promote rice early return to green, early delivery, early growth, promote rice root robust and reduce the incidence. 3. For rice fields that have already been affected, timely fertilizer should be applied according to the type of nutrient deficiency to control the condition. For potassium deficiency type blight, water should be drained immediately, and then shallow water irrigation to promote the formation of new roots; timely recovery of potassium sulfate 4 ~ 6 kg / acre, or foliar top dressing 1% potassium sulfate. In the case of zinc-deficient schistosomiasis, drain the field immediately, implement shallow water irrigation, and promote new root formation. Timely application of zinc sulfate 1 ~ 1.5 kg / acre, or foliar topdressing zinc fertilizer. But be careful not to use alkaline fertilizers, so as not to aggravate the condition. Phosphorus monophosphate and other phosphorus-containing trace fertilizers should be applied to phosphorus-deficient soil in a timely manner. Never use nitrogen fertilizer alone to avoid aggravating the disease.
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