Rice water weevil damage adult crops and larvae damage rice crops, mainly larvae damage. Adults eat leaves, larval food roots, resulting in reduced rice roots and tillers, growth retardation, delayed maturity, and even stop growing, the whole plant died. Since rice water weevil spreads through water, land, and air, comprehensive measures must be taken to prevent and control it.
I. Agricultural control
1. Reasonable fertilization. The fertilized paddy field larvae have a large amount and grow in a straight line. Therefore, selecting a good fertilization period and rational fertilization can reduce the population density.
2. Remove weeds. Before the adults migrated to the rice fields in spring, they had to remove and burn the surrounding weeds before the autumn and winter seasons, which caused them to lose their wintering sites and directly eliminate pests.
3. To eliminate the overwintering adults through farming operations such as autumnal gardening and spring turning.
Second, chemical prevention
1. Adult pest control: As far as the situation in our district is concerned, prevention and treatment of overwintering adults is carried out in the early-half of June. The pharmaceuticals can use 28% hypertonic rice Lefeng EC, 680 ml/ha, and 750 kg watered; 36.8 % Victoria rice oil 750-900 ml per hectare, 450 kg watered, or 1800 ml per hectare mixed soil. Speed ​​can also be used, insecticide double and other agents. The best time for spraying is in the evening.
2, larva control: control larvae in the late larvae in late July to carry out, available 36.8% Victoria rice emulsifiable concentrate 1800 ~ 2250 ml per hectare mixing soil or mixing fertilizer, after medication to maintain 2 ~ 3 cm water layer.
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