Symptoms: After direct spraying of trichlorfon, dichlorvos, and other organophosphorus pesticides on the sorghum, the symptoms of the pesticide were observed within 12 hours, and the leaves were all scorched after 72 hours. When the insecticides or herbicides were applied to neighboring fields or nearby, they were reddish-brown spots on the leaves after the wind drifted onto the sorghum. After the spots expanded rapidly, they merged into large patches, resulting in scorching of the whole leaves. Fire burning.
The etiology of sorghum is sensitive to dichlorvos, trichlorfon, phoxim, safrole, phosphamide, carnitine, chlorimicarb, 2,4-d, etc., and is directly applied to sorghum or improperly applied within 500m. All may cause sorghum to produce phytotoxicity.
Control methods (1) Do not apply the above organophosphate insecticides and sensitive herbicides in sorghum. (2) The wind direction should be selected when using the drugs in neighboring fields so that it can be used in the downwind position. (3) After the occurrence of phytotoxicity, it should be quickly flushed or watered, and at the same time, strengthen management.
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