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According to the analysis of the organization of experts from the National Agricultural Technology Center, in 2015, the second and third generations of armyworms in the northeast, north China, Huanghuai and southwest regions were light to moderate, and some areas have the possibility of high density concentration. Up to 70 million acres.
Prevention and Control Strategy
Strengthen the prevention and control of the wintering area and the first generation of armyworms, and reduce the risk of moving to the second-generation main hair area and the three-generation main hair-producing area. In the early stage, we will focus on the prevention and control of the second generation of wheat armyworms, and control the second and third generations of armyworms to damage rice and corn. The base of the insect source; control the occurrence of adult worms, reduce the amount of eggs laid, grasp the critical control period before the larvae 3rd ingestion hazard, concentrate the contiguous remedies, and isolate and control the local high-density areas.
Prevention and Control Measures
(1) Key prevention and control area
The second and third generations of armyworms were harmful to corn in the northeast, north China, and Huanghuai, corn and rice in the southwest from June to August, and attention was paid to the prevention and control of armyworms on rice and rice.
(II) Main technical measures 1. Adult trapping and killing technology
(1) Sex trapping method. With a dry trap equipped with a sticky insect attracting core, one rod per acre is hung in the field to trap the adult.
(2) Insect lamp method. In the adult period, insecticidal lamps are placed in the field, the lights are separated by 100 meters, and lights are turned on at night to trap adults.
2. Larval control technology
Pay attention to timely control of weeds in the field, and control the larvae before the age of 3.
(1) Biological pesticides: Spray the Bacillus thuringiensis (Bt) preparation at the peak of the hatching of the armyworm eggs. Note that the field near the mulberry field cannot be used, and the young larvae can use the young urea.
(2) Chemical pesticides: When the density of insects in wheat or paddy fields is more than 20 heads per square meter, and the density of corn field insects reaches 10 heads/hundreds and 100s in three generations, more than one hundred salt/hundred plants can be used. Insecticide spray treatment such as benzamide.
3. Blocking isolation technology
In the case of the migration of armyworm larvae, sprinkle 30 cm wide strips to block; or put phoxim poisonous soil in wheat and corn fields to establish a barrier.
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