It is learned from the Jilin Provincial Agricultural Technology Extension Station that it is expected that the occurrence range and degree of harm of a generation of armyworms in our province this year are close to 2017, and local areas such as central and western Jilin Province may be more serious, and high-density concentrated hazards can occur in extensive management, grass barrenness or low-lying fields, reminding farmers to pay close attention to the occurrence of armyworms in mid-june and late June, and do a good job in prevention in advance. In addition, farmers are reminded that corn exceeds 6 leaves can not spray herbicides such as chimney sulfonone and nilfonyloxazone, and it is recommended that it is relatively safe to use bracts before 11 leaves.
Rice currently to shallow water irrigation, appropriate amount of application of tillering fertilizer, at the same time, do a good job in the prevention and control of leafminer flies, rice water weevils, negative mud worms, for the early stage of closed weeding effect is not good, in the tillering period of medication, according to the field weed species can choose does not affect the safety of rice tillering herbicide, take stem and leaf treatment before.
Technical measures for the control of armyworms
1. Adult booby trap technique:
(1) Sexual attractants. With a dry moth trap equipped with a forceworm trap, 1 pole per acre is hung in the field.
(2) Insecticidal lamp. During the adult occurrence period, insecticidal lamps are placed in the field, the spacing of the lamps is 100 meters, and the lights are turned on from 8 pm to 5 am. The use of concentrated continuous film is effective in prevention.
2. Larval control technology:
(1) Biopesticides:
At the beginning of the hatching of the armyworm eggs, spray the Bacillus thuringiensis (Bt) preparation, noting that the plots adjacent to the mulberry garden cannot be used, and the young larvae can be exterminated.
(2) Chemical pesticides:
When the larvae of the armyworm are found, it is best to choose a quick-acting insecticide spray, such as kung fu permethrin + methyl vitamin salt, flullingurea + high-efficiency cypermethrin. These agents are basically based on touch killing and gastric poisoning, and the spray is sprayed to the location where the armyworm inhabits the activity. Chloranthrine benzamide, insecticide, hydrazine suppressor and other slow-acting insecticides are best not to be used alone.
In the process of prevention and control of corn armyworm, try to control corn armyworm before the third age. The prevention and control time generally chooses the high incidence time of morning and evening larvae feeding, and the spray site is applied to the corn heart leaf as much as possible, pay attention to personal protection, and strictly prevent poisoning accidents.
In addition, the armyworm has the habit of being frightened to the ground. When spraying, pay attention to spraying the surface of the ground to eliminate the "slipping net" insects that fall on the ground. At the same time, it is also necessary to spray weeds on the side roads of the ground, and strive to eliminate the "extralegal insects" that inhabit there.