The chestnut pests can take biological control measures. The biological control measures of chestnut pests mainly focus on the introduction of chestnut varieties, the selection of disease-resistant and high-yielding trees as mother trees, regular clearing gardens, timely drainage of water in rainy days, use of natural enemies of pests, etc. Etc., regarding the biological control of chestnut pests and precautions for the use of pesticides, Xiaobian will explain in detail below.
First, alternative drug technology
1. Biological control pests
Natural enemies have obvious inhibitory effects on chestnut pests. When the pests fail to reach the control index, for example, the female pupa on the 10 cm branch of the chestnut carp is less than 1.5, and the number of insect worms can be controlled by the natural enemies of the chestnut mites. To prevent pests from expanding into disasters.
2, artificial treatment of pests and diseases
In the winter clearing garden, moderately trimmed chestnut trees, remove pests and branches, dead branches, and burned intensively to reduce the number of wintering pests and reduce the risk of pests and diseases in the coming year. In the early spring, according to the wintering characteristics of pests such as chestnut scorpion and chestnut mites, artificially scraping the overwintering egg mass and the female oyster shell were carried out in time. According to the adult death of the adult chafer, the artificial insects on the tree were shaken in the evening. For the chestnut garden where the chestnut bee is harmed to form a large number of insects, artificially removing the insects can be used to reduce the occurrence of pests.
3, light traps pests
The use of some pests has a phototaxis characteristic, and the black light is used to attract and kill, and the effect is not instantaneous. The effect of trapping the black turtle and the chestnut beetle adult with black light is also good. The light trapping method has low cost for pest control and no pollution to the environment, and is worthy of promotion and utilization.
Second, the use of pesticide technology
1. For the orchard where chestnut dry blight occurs, as long as the scraping buds are applied or sprayed on the buccal branches; the chestnuts that are harmed by the chestnut drop are as long as those with more than 1.5 female pupa in 10 cm. It can be applied or sprayed; when the adult chafer is controlled, it can be sprayed on the tree when the tree is damaged in the evening.
2. When spraying with a sprayer, spray nozzles should be used to reduce the amount of pesticides and evenly spray the liquid without waste.
Third, the use of pesticide technology
1, prevention first
When the pests are not active and the symptoms are manifested, they should be used in a timely manner to prevent the occurrence of pests and diseases and effectively control the spread of pests and diseases. Before the winter and early spring germination, each spray of Baume 3-5 degree stone sulfur mixture and 0.3% pentachlorophenol mixture can effectively eliminate the wintering pests and diseases, avoiding the development of pests and diseases after the sprouting of chestnut trees. disaster.
2, prevention and treatment is fast
It is necessary to prevent and control the pests and diseases that are harmful to the chestnut garden in a short period of time, so that the pests and diseases are difficult to breathe and escape. It is worth noting that the same concentration of pesticides should be the same, to prevent the spread of pests and diseases in the unsprayed parks to the sprayed parks, and to invade the high-concentration control areas in the low-concentration spraying areas.
3, prevention and control must be
Pests have hatching, emergence and hazard period. In the prosperous period, they can be treated with half the effort. The overwintering larvae of the pheasant winter larvae emerged in the late May, and 50% phoxim emulsifiable concentrate was sprayed 300 times on the ground to suppress the number of adult worms. Spraying the venom during the dangerous period of the scarab can greatly reduce the number of pests. . In mid-June, it is the emergence period of the adults of the chestnut peak, and the prevention and control can reduce the number of insects in the coming year. In early June and in the middle and late July, the first and second generation larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae of the larvae can be effectively eliminated. In the middle of September, the third generation of the larvae of the peach larvae was in the ovulation stage, and it was controlled by a dichlorvos with a short-lasting period or a highly effective and low-toxic enemy.
4, choose medication
The pests and mouthparts are different, and there are chewing type, sucking type, sucking type, etc., and the stomach poisoning agent for controlling chewing mouthparts pests is ineffective, and the stomach poisoning agent is ineffective against the pests of the sucking mouthparts. For example, for the chewing mouthparts pests such as the chafer and its larvae, chestnut black star beetle, gastric toxicity agents should be used; for sucking mouthparts pests such as chestnut scorpion and chestnut scorpion, a systemic drug should be selected; The contact killing agent and fumigation agent have a good effect on the control of the chestnut peak adult and the larvae of the chestnut larvae and the larvae of the chestnut larvae flying in the chestnut garden.
Fourth, the relationship between medication and meteorology
The temperature is high and the humidity is small, and the effect of controlling pests and diseases is good. On the contrary, the temperature is low and the humidity is high. The effect is poor; the pests such as chestnut scorpion, chestnut scorpion, chestnut red spider, chestnut blight, chestnut anthracnose, etc. Hour medication can effectively achieve the purpose of prevention and treatment;
During the rainy season, pay attention to the weather changes. After the application of the medicine, it will encounter heavy rain. It will not only waste money, but also prevent the effect. If the rain stops or if it is sprayed with drizzle, the concentration of the agent should be higher and the agent should be diluted by rain. If the application is windy, it is best to stop spraying, to avoid poisoning by the application personnel.
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