What are the control methods of rice chironomid?

It is a common pest that harms the roots of rice by larvae, affects the normal growth and development of rice, and even causes floating seedlings and dead seedlings. What are the ways to prevent and cure it? When does it show up?

What are the control methods of rice chironomid?

1. Agricultural prevention and control

When the damage of rice chironomid is found, draining and drying the field for 2-3 days (subject to the cracking of the field surface) can resist the occurrence of rice chironomid.

two。 Chemical control

The main results are as follows: (1) according to the dosage standard of 100-200 grams per mu, the dosage of copper sulfate is calculated, packed into cloth bags, placed at the water inlet, and flowed into the paddy field with irrigation water, which can not only control insects but also prevent moss. After the water is drained, a cloth pocket containing 90% crystal trichlorfon is placed at the inlet. When the water is about 1 inch deep, the inlet is blocked. After 12 hours, it can be found that the rice chironomid crawled out of the water surface and died of poisoning.

(2) apply pesticide in the soil layer of the root zone after withdrawing water. Use 15% chlorpyrifos (Lesben) granules 70-100g per mu, or 3% furan granules 133-200g, mix soil or spread fertilizer. You can also choose 48% chlorpyrifos, 50-80 ml water spray per mu, 41% Avi chlorpyrifos 75-100 grams per mu water spray, 90% crystal trichlorfon 600 times liquid spray, depending on the condition of the insect spray 1-2 times.

(3) with 1 kg of 5% methyl mixed phosphorus granules and 15 kg of soil (sand) per mu, it can also control other pests and has a good effect.

When did rice Chironomus appear?

Rice chironomid generally produces four generations a year, overwintering as adults. The overwintering adults appeared at the end of April of the following year, began to lay eggs in early May, and the first generation of larvae occurred in mid-May. The first generation of adults began at the end of May, selecting clayey plots such as black soil, meadow soil, saline-alkali soil and old paddy fields to lay eggs. The eggs hatched for 5 days, and the larvae swam and dived to the roots of rice to feed on the young roots. The larvae are red when they grow to 2 mm. Since then, they have been living on the rice roots in the live mud and continue to do harm. The larvae pupated after 12 mi for 14 days. Among the four generations of rice chironomid, the first and second generation larvae do more harm to rice. Although the third and fourth generation larvae also live in the rice field, they basically have no harmful symptoms.

Rice chironomid is generally distributed in Heilongjiang, Ningxia, Hunan, Longnan (Kangxian) and other places, the majority of rice growers should pay attention to control.