Prevention and control of rice weevil catching adult medicine

Rudong Xindian Wang Genli made a phone call on June 25, saying that his family had transplanted rice in more than 2 mu, and some recent rice plants had horizontal rows of leaves on their leaves, and some rice leaves were broken and floated on the water. The lower part of the plant was large. The leaves suffer more, and 20%-30% of the plants in the field suffer. Examining the damaged rice plants, no pests were found. He asked what kinds of pests the rice was exposed to, and what chemicals were used to prevent it.

When interviewed by reporters on relevant issues, the Provincial Academy of Agricultural Sciences Plant Protection Institute Fang Jichao said that rice is endangered by adult rice weevils, and horizontal rows of holes often appear on the leaves, and some leaves are folded and float on the water.

It is understood that in the province of rice weevil 1 generation occurred in 1 year, adults lay eggs in May-June. Adult rice weevil eating rice leaves will cause direct damage to the rice, the field often have inverted rice leaves. Early and late adult activities, hiding in the daytime during the day between the rice plant clusters or field tussock grass, there are suspended animation and phototaxis. Before spawning, bite a small hole in the rice stem or leaf sheath, spawning 3-20 eggs per hole. Egg period 5-6 days. The larvae stayed in the leaf sheaths for a short period of time after they hatched, and soon they drilled into the soil. Most of the larvae flocked to the soil and fed 2-3 cm of young fibrous roots and humus under the ground. Article. The rice weevil larvae accumulate in the roots of rice and eat young rice roots. The light rice plants have stagnated their growth and become yellow and dwarf. Although they can be eared but have uneven maturation, they are not full grains; heavy rice plants are withered and cannot be spiked. . In general, there are more hills and semi-mountainous regions than plains. There are more high-drying fields than low-lying fields, and there are more sandy lands than viscous lands. The adults of rice weevils are small and have nocturnal habits. The larvae enter the soil after hatching, and they are not easy to detect without careful inspection.

For the control of rice weevil, we should seize the drug during the adult stage, and it is more difficult to control the larvae when they enter the soil and damage the roots of rice after hatching. The control of adult rice weevils is applied during the peak period of adults; control of larvae is performed during the peak period of egg hatching until the early stage of larval introgression, and spraying is generally conducted 20 to 25 days after rice is transplanted. At present, the pesticides registered for the control of rice weevil include triazophos, etofenprox, malathion, butylthiocarbamate, imidacloprid, methylisophos- phos, and isocarbophos. In addition, chlorantraniliprole and chlorpyrifos also have good control effects on rice weevil. After the larvae have hatched and applied pesticides, field water sprays should be drained.

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