Dichlorvos are very fumigant. It is very effective in the prevention and control of fumigation in wheat fields. The drug is used in paddy rice fields and has poor safety and often causes burnt seedlings. Rice should be avoided in the field of paddy field. If used, it should be strictly applied as required. Generally, 80% of dichlorvos per acre with 200 ml of water plus 30-45 kg of uniform fine spray, or 80% of dichlorvos EC with 150 ml of fluvo-aquic soil 20 - 25 kg will be applied after the field has dried. When spreading poisonous soil, be careful not to have water on the rice leaves. After applying the pesticide, use bamboo vine to lightly pick the seedlings and dredge the medicinal soil over the fields. Dichlorvos cannot be used multiple times to prevent phytotoxicity.
In the corn field, organic phosphorus and pyrethroid pesticides are used to control Laodelphax striatellus, and the concentration of the liquid medicine should be strictly controlled, otherwise it is easy to produce phytotoxicity. Generally, 50% of the rice oil used in the plant is used as a 1000-1200 times solution; 48% of the chlorpyrifos is used as a 2000-fold solution, and the dilution factor is not less than 1000 times; and the pyrethroid pesticide is generally used in 2000-3000 times. Dichlorvos, phoxim and fenvalerate are prone to phytotoxicity on corn and are generally not to be used.
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