Prevention and control of corn stickworm

Mythimna control measures

1, biological control

The viscous adults have strong phototaxis and chemotaxis habits, and are sensitive to sweet and sour, so they can use these characteristics for biological control, using light, sexual agents and sweet and sour baiting to kill them in a centralized manner and effectively reduce the number of adults. To reduce the effect of population density.

The method of cereal grass: The adults of the armyworm are like to hide in the hay. They can tie the grass into a straw with a diameter of 5 centimeters. About 80 sticks are inserted in the mu, they are changed every 5 to 6 days, and then the grass is replaced. Burn out and destroy the adult hidden in it. Sweet and sour method: Using the characteristics of adult armyworm larvae like sweet and sour vinegar, sugar, vinegar, wine, water and a certain amount of trichlorfon insecticide mixed, made of sweet and sour liquid attractants, on the field about 1 meter high, It can entice adult armyworms to come and poison after eating. Sex trapping method: using a dry trap with an armyworm attractant, one per acre corn field, the adult will be attracted by the sex attractant to trap adult insects. Insecticidal lamp method: Adults are attracted by light. During the mating and spawning period, insecticidal lamps are placed in the field at a distance of 100 meters. Lights are turned on every night and light is used to trap and kill adults.

2. Agricultural control

Strengthen crop rotation: This method is mainly to carry out reasonable corn field management. After corn is harvested, the corn field is completely cleaned up, and Tanaka's residual leaves and grass are cleaned and then burned in a centralized manner. For the land where the armyworm has been harmed, it is necessary to avoid continuously planting grass crops such as corn in the same plot, and to conduct reasonable rotation. Try to avoid contiguous planting of corn and plant some other crops within a certain distance for isolation.

Strengthen management: Select insect-resistant varieties, strengthen field management during corn growth period, manage water and fertilizer well, do cultivating well, increase corn growth, and increase resistance to pests and diseases.

3, chemical prevention

Chemical control is mainly achieved through the spraying of chemical agents. The most suitable stage is before the adult eggs are laid, before the eggs hatch, and before the larvae are 3rd instar.

Early prevention and control: The young instar larvae can be used to prevent and cure spraying, and the control effect is ideal and the harm to natural enemies is relatively small.

Medium-term prevention and control: For larvae above 3rd instar and over 3rd age, high-efficiency chemical agents are used for prevention and treatment. Commonly used are Lesiben EC, diflubenzuron, cypermethrin or fenpropathrin.

4, matters needing attention

After the armyworm occurs, in order to avoid the migration of the armyworm, it is possible to isolate it on the transfer route and sprinkle the medicine with a width of about 15 centimeters. It is also possible to use the method of spreading with phoxim EC. isolation. After the armyworm occurs, the use of pesticide sprays for prevention and control should be performed before 9:00 AM every day or after 5:00 PM. In the event of rain, it is necessary to replenish the pesticides in time to prevent the rain from diluting the liquid and failing to achieve efficacy. To the effect it should have. When spraying the liquid, it must be full and uniform, and weeds must be sprayed on the field, on the ground, or even on the roadside. If the worms are older, the dosage should be increased to avoid the effects of strong anti-drug and not to kill, which will affect the control effect.

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