Summer rain increases, especially in the rainy season, when the temperature and humidity change greatly, various pests and diseases of peach tree are very easy to occur. Recently, when interviewed by reporters, many farmers reported that there have been many pests and diseases on the peach tree recently. However, because they cannot tell exactly which species they are, they do not know how to prevent it. The reporter consulted Zhang Zhicheng, a member of the Expert Advisory Group of the newspaper and the fruit specialist of Northwest Agriculture and Forestry University. According to Zhang Zhicheng, insect pests in the summer are generally dominated by hawthorn leafhoppers, and the diseases are brown rot and bacterial perforation. Therefore, production management should pay attention to investigation and timely prevention and treatment. Hawthorn Leafhopper Hawthorn leafhoppers generally begin to damage on peach leaves in June, and the most serious damage is from July to August. Peach leaves first appeared gray spots after injury, and when they were severe, the leaves scorched and even caused some leaves to fall off. After the middle or late June, its natural enemies were transferred to the leaves of peach trees to feed on the leaves of the hawthorn. However, when the number of thrips in the peach orchard was relatively small, they needed to be sprayed. “It is good to use Keziite 2000~2500 times as the medication, and the fruit growers should have a flexible grasp during the spraying period.†Peach brown rot Peach brown rot, also known as sclerotinia, is one of the most important diseases of peach trees. It mainly damages flowers, shoots and fruits. The fruit damage will initially produce brown round spots, which can be expanded and the whole fruit within a few days. Brown soft rot. "Peach blossoming and young fruit period in case of low temperature and rain, and fruit maturity and high temperature and humidity when the disease is severe, weak tree vigor, poor management, low-lying or overly dense foliage, poor ventilation and light transmission is also caused by the disease The main factor is heavy," Zhang Zhicheng said. Therefore, it is best to carry out comprehensive prevention and treatment against this disease. First of all, it is necessary to do a good job in clearing the garden and completely remove stale fruit and diseased branches and burn them; second, we must strengthen drainage, increase organic fertilizers to enhance tree vigor, and cut off too many shoots to ensure ventilation; this season Medication, spray 65% ​​mancozeb WP can be 500 times, or thiophanate-methyl 800 times. It is usually sprayed every 10 to 15 days, and it can be sprayed 2 or 3 times. Bacterial perforation Bacterial perforation mainly occurs on the leaves and can also invade the fruits and shoots. The early stages of the onset of the leaves are water-spotted, small spots that expand to become round, polygonal, or irregular, with purple-brown to dark-brown spots. Zhang Zhicheng said that in general, the disease can occur after leafing in mid-April, especially in June and July when the disease enters a major stage. Here, we remind farmers that prevention and control can be carried out in the following aspects: removing dead branches in winter and eliminating pathogens; rational pruning, improving ventilation and light transmission, avoiding canopy closure; increasing phosphorus and potash fertilizers, increasing tree vigor and raising disease resistance On pharmaceuticals, it can be controlled by 65% ​​zein zinc WP 500 times or Jinshili bactericide. Many growers are accustomed to using streptomycin to control bacterial perforation, but many streptomycins or penicillins on the market currently have poor quality and low levels. Therefore, it is recommended that you choose the regular manufacturers to buy pesticides.
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