The rice water weevil is a kind of pest that seriously damages rice. The worm is a phytosanitary pest that enters China, and a national phytosanitary pest of agricultural plants. It mainly harms grasses and cyperaceae, and its adult pests damage rice leaves and larvae. Damage to the roots of rice can generally result in a 10-30% reduction in rice yield, and in severe cases it can reach more than 50%, or even an imperfection. The rice water weevil is native to North America and is mainly distributed in the United States, Canada, Mexico, Cuba and Asia, Japan, North Korea, South Korea and China. Fujian, Jiangxi, Hunan, and Guangxi provinces (regions) adjacent to Guangdong have already occurred. Guangdong This is the first occurrence. Control measures: 1. Agricultural control Can take to strengthen water and fertilizer management, appropriate shallow water cultivation, pay attention to the sun during rice growth, so that the rice field mud hardening, inhibition of rice water weevil larvae. After rice is harvested, straw is disinfested and weeds are removed from the surrounding paddy fields. Change the planting methods, implement dry seedlings and non-woven dry seedlings, and where possible, use non-host crops such as vegetables and fruit trees. 2. Physical control Rice insects can be trapped to kill adult rice weevil in the rice growth period. 20-mesh insect nets can be used throughout the breeding period to prevent overwintering adult migration. During the transplanting process, the roots were cleaned and the number of rice water weevil larvae was carried on the seedlings. 3, biological control Reduce the use of high-toxicity and high-residue pesticides through paddy fields to protect predators such as cockroaches, frogs, fish, sparrows, crickets, cockroaches, and spiders. Rice field ducks and fish farming can also be used for biological control.
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