Cause and performance of improper application, high concentration or uneven spraying, or excessive use, or use of expired drugs, often yellow-white or brown focal spot, and even whole leaves and whole plants withered and yellowing, into pieces withered. The use of rice foot green to prevent sheath blight, often appear young green seedlings, ears but not real. The use of high concentrations of 2,4-D and dimethyltetrachloro-chloride herbicides can lead to deformed leaves.
Preventive measures Before using pesticides, it is necessary to know in detail the varieties, properties, uses, methods of use, and precautions of the pesticides. Do not misuse pesticides. Do not use excessive amounts and high concentrations. Properly configure and apply the pesticides according to regulations. The correct use of medication time, such as the use of dimethyl tetrachlorm herbicide, is generally the safest in the tillering period. Before the seedlings are applied at the 5 leaf stage or after the jointing stage, they are susceptible to phytotoxicity.
Remedial measures If phytotoxicity has occurred, fresh water should be immediately drained and filled, and quick-acting fertilizer should be added to promote the growth of rice seedlings. Where early detection of herbicide poisoning occurs at the bud and seedling stage, the use of plant ash or sprayed alkaline water as soon as possible can reduce the phytotoxicity.
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