There are many American moths in the courtyard of Building 35, Shizhong Street, Kuiwen District, Weifang City. What should I do?

1, cut off the branches and leaves with pests and destroy them centrally.

Step 2 spray cypermethrin

Main control measures of Hyphantria cunea

According to the living habits and harmful characteristics of Hyphantria cunea, four prevention and control measures were taken in three stages of Hyphantria cunea occurrence: artificial, physical, chemical and biological.

(A) adult prevention and control technology

1. Artificial elimination of adults. Adults are dormant in the lower part of the trunk, and their flight ability is not strong, so they can be directly killed artificially. Specific time, from mid-late April to early May, prevent overwintering generation, prevent first generation from late June to mid-July, and prevent second generation from early August to late August. Pay special attention to the trees around smelly puddles, livestock pens, pigsty, farms and toilets, and the sanitary conditions are poor.

2. Trap and kill adults. Taking advantage of the phototaxis of Hyphantria cunea, in the area where Hyphantria cunea occurred seriously last year and the surrounding area was empty, trapping and electric shock insecticidal lamps, frequency vibration insecticidal lamps and black light lamps were used to trap and kill adults in the adult stage. This method can also provide a basis for pest prediction and reflect the emergence of pests in time and accurately.

(2) Larvae control technology

1. Manually cut off the screen. In the heyday of 2-3-year-old webworm, carefully search for webworm larvae every 2-3 days and cut them off. Be careful not to break the net when cutting it, so as not to let the larvae out. The cut net curtain and the larvae scattered on the ground were immediately burned. The work should focus on the first generation of larvae from late May to early June, because the reproduction of American white moth is relatively large, and killing one larva at this time is equivalent to killing 200 million larvae in autumn. Secondly, the second generation larvae (early July-late July) and the third generation larvae (early September) are cut off at any time.

2. Spray drugs on trees. New chemical control agents, such as antibiotic pesticides, botanical pesticides, bionic agents, etc. It is mainly used for spraying pesticides on trees, and highly toxic pesticides are strictly prohibited. Spray chemicals on trees 2-3 times per generation, either manually or by plane.

(1) A new antibiotic pesticide. This kind of pesticide is represented by avermectin. Its insecticidal mechanism is to block the transmission of motor nerve signals of pests and make them paralyze and die. It has the characteristics of quick effect, high efficiency and environmental protection.

(2) Botanical pesticides. This kind of pesticide is prepared from plants and has the characteristics of high efficiency, broad spectrum and environmental protection. At present, ginseng alkali emulsifiable concentrate and matrine insecticide for cigarettes can be selected. After spraying, the mortality rate of 2 ~ 3 instar larvae can reach above 99%.

(3) bionic preparation. Biomimetic preparation has the advantages of high efficiency, low toxicity and environmental protection. Its insecticidal mechanism is mainly that drugs and enzymes combine in insects to make them lose their activity, which leads to abnormal molting and death of insects. At present, the commonly used bionic preparations mainly include diflubenzuron ⅰ, diflubenzuron ⅲ, Miman, cause of death, diflubenzuron, clofenuron and so on. It is mainly used to control the 2nd-3rd instar larvae of Hyphantria cunea.

(4) Viral biological agents. At present, Hyphantria cunea nuclear polyhedrosis virus is widely used, which has strong pathogenicity to Hyphantria cunea larvae and is obligate parasitic. The control effect is above 93.7-99. Because the effect of virus preparation is relatively slow, the best period of control is 2-3 instar larvae.

(5) Bacterial biological agents. Bacterial biological agents of Hyphantria cunea are mainly represented by insecticides such as Bacillus thuringiensis, which have ideal control effect on Hyphantria cunea larvae of all ages and are pollution-free.

(6) Prevention and control of low toxic pesticides. Hyphantria cunea does not produce drug resistance, and the ideal effect can be achieved by spraying evenly and thoroughly according to the normal proportion.

3. Smoke control. The forest where the American white moth occurs seriously can be treated by spraying smoke or releasing smoke agent with a smoke machine. Smoke spraying should be carried out before 9: 00 am and after 5: 00 pm in windless weather. The control time is the same as the spraying control time.

4. Surround the grass to lure the pupa. Before the mature larvae begin to pupate, they are bound to the trunk with cereal grass, straw, wheat straw and weeds at a distance of 1 to 1.5 meters from the ground. Lure mature larvae to pupate in the surrounding grass for a week, and then clear the surrounding grass and burn it centrally before pupation. Because the pupation overwintering period of the third generation larvae is long, it needs enough time to remove pedicels, which is beneficial to organization mobilization and can greatly reduce the population density in the coming year, so this method is especially suitable for the control of the third generation mature larvae. Time: Tie it in the middle of September and burn it before the end of 0+ 165438. When removing the stalk, we should pay attention to spreading a bundle around the trunk to prevent the pupae from scattering underground, and at the same time, we should pay attention to removing the insect pupae stuck to the bark.

5. poison ring. Before the mature larvae come down to pupate, the waste engine oil or waste diesel oil and pyrethroid pesticides are mixed at the place where the trunk is about1-1:1kloc-0/5 from the ground, and then coated on the trunk, about/kloc-0. The specific time is: prevent the first generation in mid-June. Be wary of the second generation at the end of July. Third generation prevention in the middle and late September. This method should be used with caution on young trees.

6. Tie a poisonous rope. Before the mature larvae pupate, the straw rope and hemp rope are soaked in the liquid medicine to make poison rope, which is tied to the trunk to kill the larvae. Good effect (the ratio of liquid medicine and control time are the same as above).

7. Release Zhou's biting wasp. Perignathus is one of the important parasitic wasps in the pupa stage of Hyphantria cunea, which parasitizes in the pupa of Hyphantria cunea and feeds on the nutrients in the host pupa. Its eggs, larvae and pupae are all spent in the host pupae. At the mature larval stage, kill the host, pupate in the empty pupa shell of the host, and fly out after the adult bees emerge.

(1) field release technology. Flood release method can be used for prevention and control. The release amount of this bee in mature larval stage and early pupation stage is 65438 0 times, which is 3 ~ 5 times that of Hyphantria cunea larvae. This wasp can quickly control the population of Hyphantria cunea and play a continuous role in prevention and control.

(2) The population continuation of Tetrastichus in nature. There are many common forest leaf-eating pests in forest areas, such as willow moth, elm moth, Yang Fan moth, inchworm, big bag moth and so on. They are all the main hosts of the Zhou's biting wasp. Wasps produce seven generations a year, while American white moth produces only three generations a year. Therefore, except for the pupae of Hyphantria cunea, other generations are parasitic in the pupae of other hosts, and the pupae of these hosts are interrelated in the growth and development stages of a year, so as to maintain the continuity of the bee generation and the population number of each generation and realize the long-term control of Hyphantria cunea.