What is the harm of agricultural pest meadow borer? What kind of medicine should be used for prevention and treatment?

Meadow borer, Pyralidae, also known as yellow-green stripe borer, beet net borer, aphid borer, meadow borer are polyphagous pests, mainly harming beet, soybean, sunflower, potato, hemp, vegetables, medicinal materials and other crops. What are the hazards of meadow borer? What kind of medicine should be used for prevention and treatment?

In the first and middle of June, the overwintering adults of meadow borer increased abruptly in the eastern part of Inner Mongolia, the southwest of Heilongjiang and the west of Jilin. The number of adults was high under the lamp and in the field, and the occurrence area of adults was more than 15 million mu. Recently, the number of overwintering adults in Northeast China has gradually decreased, the number of first-generation larvae has increased significantly, and the number of larvae in the fields with local suitable for spawning and weeds is high and harmful. Preliminary statistics showed that the occurrence area of the first generation larvae of meadow borer was more than 7 million mu as of June 20.

Damage of meadow borer, Chilo suppressalis

The meadow borer overwinters as mature larvae in silky soil cocoons. The overwintering larvae begin to pupate in the following spring with the increase of sunshine and temperature, and generally enter the peak period of Eclosion from lower May to early June. After Eclosion, the adults of the overwintering generation moved from the overwintering place to the occurrence place, and then moved to the overwintering area after breeding for 1 or 2 generations, and then spawned and propagated until the mature larvae were buried in the soil to survive the winter. The newly hatched larvae feed on the mesophyll and residual epidermis, and when they grow up, they can eat the leaves into scars or leaves only veins, so that the leaves are reticulate. When it happens, it is also harmful to flowers and young English.

How to control meadow borer

1. Agricultural prevention and control

According to the characteristics that meadow borer likes to lay eggs in gray vegetables, pig hair vegetables and other weeds, attention should be paid to eliminating weeds in wasteland, ponds, fields and fields to reduce the number of eggs laid by meadow borer, and weeds in the field should be removed in time to eliminate some insect sources. Autumn or winter ploughing can also eliminate some of the cocoons overwintering in the soil, which can not only reduce the control cost, but also improve the control effect.

2. Chemical control

Because the meadow borer has the characteristics of mass migration and overeating, the control period is relatively concentrated, and the control must be carried out in time before the 3rd instar of the larvae, that is, within 10-12 days after the peak egg hatching period. As the distribution is uneven and the harm is hidden, it is necessary to emphasize timely field inspection and "selective treatment". When the density of larvae in the field is high and the damage is scattered, the joint defense of farmers should be organized to control the larvae in a large area.

Medicament selection: meadow borer is not resistant to common insecticides. Considering comprehensively, it is appropriate to choose agents with low toxicity, fast knockdown speed, safe to crops and more economical.

It is recommended to use potions:

During the peak period of moth activity of meadow borer in sunny afternoon, ① was sprayed with pyrethroid insecticides to kill adults (the dosage should not be increased on corn and sorghum, otherwise drug damage would occur).

② larva control: in the larval low instar (1Mel 2nd instar), chemical pesticides are used to control the larvae: 2.5% Kung Fu EC 12MUR 20ml, spray with 50kg water per mu. 4.5% cypermethrin 30 ml per mu.

③ uses machine-driven hanging sprayer, tractor to maintain second speed, spray volume of 30 kg per mu for prevention and control, or use knapsack mobile sprayer, 5 meters apart between each person, a word to line up the spray.

3. Physical prevention and control

Set up black lights in bean fields to trap and kill adults.