Due to the high variety of tree species and the complicated site conditions, chestnuts have become more difficult to control pests and diseases. Although there are many diseases and insect pests, the main pests and diseases that really affect the growth of chestnut are: chestnut red spider, hibiscus, chestnut, chestnut red spot disease. In order to ensure the normal development and growth of the tree, the fruit is of high quality and high yield. The Chinese pesticide net Xiaobian now analyzes its control measures as follows:
First, 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.
Second, 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, 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 solution; cypermethrin emulsifiable concentrate 2000 times solution. Big grams of emulsifiable concentrate 1500 times.
According to the pesticide network, one of the above three formulations can be selected, adding a synergist and a 0.3% urea tree spray, applying twice during the occurrence, spraying once in early May, and spraying once in the end of June to control.
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, 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.
This article is published by the China Pesticide Network , please indicate the source.
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