Chestnut tree species are tall, planted and dispersed, site conditions are more complex, and pest and disease control are difficult. Although there are more pests and diseases, the main diseases and pests that really affect the growth and results of chestnuts are only chestnut spider mites, wood mulcher, chestnut pebbles and chestnut schistosomiasis. Control of the above pests and diseases can basically guarantee the normal growth and development of the trees. Fruit quality and high yield are analyzed as follows:
First, chestnut red spider. Chestnut spiders are common in the chestnut producing areas of my county and are seriously endangered. It usually begins in late April and early May, and ends in August. At present, in order to achieve the requirements of pollution-free fruits, the county strictly prohibits the use of omethoate dry coating, but the use of EC formulations, the specific application methods are as follows:
(1) 40% Dimethoate EC 1000 times. Da Kejing EC 1500 times liquid. 5% of Fortune EC 1500 times.
(2) 40% oleofop-pure EC 1500 times. Insect number 2000 times solution. 20% to sweep 3000 times EC.
(3) 40% dimethoate EC 1000 times; fenpropathrin EC 2000 times. Da Kejing EC 1500 times liquid.
One of the above three formulations can be used, adding synergist and spraying on 0.3% urea tree, applying twice during the occurrence, spraying once in early May, spraying once in late June, and then controlling.
Second, wooden clogs. The woodcutter is a stage disease, and it is usually broken out every 10 years. The best way to control this pest is to strengthen investigations, strengthen predictions, control the pests before they occur, and take corresponding measures to mitigate hazards and minimize continuous damage. The use of pesticides to prevent and control crickets, crickets to crickets in the trees under the weeds, clods in the winter, if the climate is dry, cricket mortality rate of more than 80%, according to this characteristic, remove the annual weeds under the trees, litter, Exposure of wintering grounds to the ground will increase natural mortality. This artificial control measures can control insects that have been infested for years but are harmless.
Third, chestnut feathers. It is also known as larvae, which are mainly larvae which damage stems and phloem, lightly weaken the tree vigor, and in severe cases cause dead and dead trees. This worm occurs two generations a year. The general rainy season is more serious, especially the old ones. After the skin is impregnated with rain, the tissue is soft and the larvae are easy to inject. The best prevention and treatment method is to manually scrape the old skin, make the new tissue hard, and the larvae are not easy to inject. At the same time, a large number of larvae can be eliminated in the process of scraping the skin, which can better control the damage.
Fourth, chestnut red spot disease. The chestnut spot disease mostly occurs during storage after harvesting, and the loss of water after fruit harvest is susceptible to disease. During storage, the temperature is high, humidity is high, and it is easy to develop. According to the above characteristics, the main measures for prevention and control are: timely harvesting, strict prevention of air-drying, ensuring normal temperature and humidity during storage, temperature is generally below 10°C, and at the same time, threshing and sales should be promptly conducted in order to reduce mildew. By grasping these steps, the disease can be controlled.
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