Peach perforation is commonly seen in bacterial perforation, fungal perforation and brown spot perforation. In recent years, there has been a trend of increasing development in various regions, among which bacterial perforation is the most serious. Perforation caused a large number of deciduous peach trees. In severe cases, it leads to dead shoots, reduced yield, and affects the formation of flower buds. In addition, perforation disease also damages many kinds of stone fruit trees such as plum, apricot, and cherry. First, the damage symptoms 1, bacterial perforation. It mainly damages the leaves, damages the fruits and shoots, leaves the leaves and suffers damage. It starts with water-stained small lesions, and then develops dark brown. There are spots with light yellow halos around the edges, and cracks form on the edges. After the lesions fall off, perforations or parts form. Connected to the blade, the lesion is about 2 mm. The fruit was affected, the lesion was dark brown, slightly sunken, and the edge was water-stained. When it was wet, the lesion appeared pyogenic and cracked when dry. Branches are affected by both spring and summer lesions, and spring ulcers occur on branches that were born in the summer of last year. After invading bacteria, dark brown herpes are formed on the branches in the spring of next year, which can cause dry branches. Summer ulcers occur at the end of the summer when the new shoots, the formation of dark purple spots as the center of the lenticel, expanded slightly after the depression, the color becomes darker, the outer edge of water stains. 2, brown spot hole. Damage leaves, shoots and fruits. The leaves were affected and both sides had round or irregular lesions. There were rims on the edges and the outer part was purple. A brownish brown mold layer appeared on the later lesions, and the lesions were 1-4 mm in diameter. The middle of the lesion was dry and shedding. The new shoots and fruit are affected. The lesions are similar to the leaves and produce brown-brown moldy layers. Second, control methods 1, dormancy period to reduce the source of bacteria. Combined with pruning in winter to completely remove litter and fruit, reduce the source of overwintering bacteria; easy to accumulate water, tree orchard prosperous orchard, pay attention to drainage, trimming dense branches, drooping branches, dragging branches, improve ventilation Conditions to reduce orchard temperature and humidity; increase organic fertilizer, to avoid partial application of nitrogen fertilizer, promote tree growth robust, improve disease resistance. 2, spraying control. Before spraying the fruit trees, spray 4-5 degrees lime sulfur. Between May and June, 75% chlorothalonil wettable powder sprayed 650 times for 1-2 times, or 3% Kecong Kang WP 1000 times, had good effect on the perforation. For bacterial perforation, control with agro streptomycin 50-100 mg/L; for fungal plaque perforation, use 70% ketorolac 1000 times, or 50% carbendazim WP 800 Double liquid prevention.
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