Chestnut is the most common fruit tree in China. It is grown in every rural area in the mountainous area. Many large-scale agricultural plants are also planted with chestnut trees. For the cultivation of chestnut trees, many farmers care about the harvest of chestnuts, many times not only because of Planting techniques affect the harvest of chestnuts, and there are some pests. So how do we usually control pests?

Chestnut pest control technology

First, chestnut red spider. Chestnut red spiders are common in the chestnut producing areas of our county, which is very serious. It usually begins in late April and early May and ends in August. At present, in order to meet the requirements of pollution-free fruits, our county strictly prohibits the use of omethoate to dry, and the use of emulsifiable concentrates, one of the following three formulations can be selected, adding synergist and 0.3% urea tree spray, occurs It is applied twice during the period, once in the beginning of May, and once in the second half of June. The specific application methods are as follows:

1, 40% dimethoate emulsifiable concentrate 1000 times. Big grams of emulsifiable concentrate 1500 times. 5% of Fuling EC 1500 times solution.

2, 40% Oxylidine EC 1500 times solution. The number of insects is 2000 times liquid. 20% to sweep the emulsifiable concentrate 3000 times.

3, 40% dimethoate emulsifiable concentrate 1000 times liquid; fenproate emulsifiable concentrate 2000 times liquid. Big grams of emulsifiable concentrate 1500 times.

Second, the wooden ruler. The genus genus is a stage disease, which usually occurs every ten years. The best way to control this pest is to strengthen the investigation, strengthen the prediction, make the pest control before the occurrence, take corresponding measures to mitigate the damage, and minimize the continuous The use of medicine for prevention and control, the hibiscus ruler to winter in the weeds and clods under the trees, if the climate is dry, the mortality rate of cockroaches is more than 80%, according to this feature, the weeds are removed from the trees every year, litter, The wintering cockroach is exposed to the ground and the natural mortality rate is increased. This artificial control measures can control the insects for many years but is harmless.

Third, the chestnut through the feathers. Also known as the chestnut-winged moth, it is mainly caused by larvae and branches and phloem. The lighter weakens the tree, and the heavy ones cause dead branches and dead trees. The insects occur two generations a year. Generally, the rainy season is more serious, especially old. After the skin is impregnated with rain, the tissue is soft and the larvae are easily injected. The best prevention method is to manually scrape off the old skin, make the new tissue hard, and the larvae are not easy to inject. At the same time, in the process of scraping the skin, a large number of larvae can be eliminated, and the damage can be better controlled.

Fourth, chestnut red spot disease. Chestnut red spot disease often occurs during storage after harvest, and water loss after fruit harvest is easy to occur. During storage, the temperature is high, the 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 air drying, and normal temperature and humidity during storage. The temperature is generally below 10 °C. At the same time, in order to reduce the mildew, it should be threshed and sold in time. Grasping the above links, the disease can be controlled.

How to prevent and cure chestnut blight

First, the symptoms

Mainly damage the trunk cortex. At the beginning of the disease, brown spots appeared, the tissue was soft, slightly uplifted, and sometimes the yellow-brown liquid flowed out from the diseased part, and there was distiller's taste. In the later stage, the diseased part was shrunk and the diseased spots were scattered with black tumor-like small spots. After the skin is dry, it is rough and chapped, and a tumor-like callus grows around the lesion. The pathogen invades from the wound and can occur throughout the year, with the peak incidence in March. In severe cases, the stems or plants die.

Second, prevention and treatment methods

1. Artificial control: carry out deep renovation and soil improvement, increase farmyard manure and turn green manure, improve soil; white coat in late autumn to prevent sunburn; the wound part of tree is easy to be infected, and the wound should be reduced and protected.

2, chemical control: before germination, scrape the disease spots, plan to destroy the dead tree and burn it, remove the pathogen. The wound is coated with rotted new stock solution or rotted 2~3 times solution. In the seriously ill orchard, spray 3~5 degree stone sulphur mixture before germination, and spray 2~3 times 0.3~0.5 degree stone sulphur mixture in the growing season.

How to prevent and control the scale insects after harvesting the chestnut trees

After picking the fruit from the chestnut tree, clear the garden in time, remove all kinds of weeds and litter from around the chestnut tree, cut off the dry branches of the canopy that are damaged by the pests, and bury or burn it outside the concentrated garden, then spray the crown once 1000. 40% smashed phosphorus aqueous solution, or 1000 times 0.5% phenoxyvir aqueous solution, or 1500 times 48% chlorpyrifos aqueous solution, or 1500 times 20% thiamethoxam aqueous solution. After 15-20 days, the canopy was sprayed with a 0.8-1 Baume aqueous solution of stone sulphur. Evenly spray all the branches and leaves inside and outside the canopy to start dropping with water drops.

How to prevent adult bites from breaking chestnut branches

1. Morphological recognition: Adults are 6.5 to 9.0 mm long, black in color, shiny, densely grayish yellow, with sparsely distributed black long erect hairs. One generation occurred in one year, and the upper and middle stages of July were the hazard period for the emergence of insects.

2, prevention and treatment methods: pick up the chestnuts, and burn them intensively. During the adult spawning period, it is regularly picked up. If it is thoroughly picked up, the effect is remarkable.

3, chemical control: can spray 75% phoxim emulsifiable concentrate, or 25% imipenem emulsifiable concentrate 1000 times solution, or spray 10% pyrethroid emulsifiable concentrate 2000 ~ 2500 times solution, 2 to 3 times in a row .

In many mountainous areas, chestnut is one of the fruit trees industries for farmers to increase their income. Because there are many places with many pests and diseases, the economic benefits have decreased, and some even caused heavy losses. But I believe that everyone can do a good job of chestnut disease. Insect control, there will be a good harvest. (Yue Ge agricultural resources network, get rich fever)

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