1, the incidence characteristics. Compared with brown leaf spot, gray spot disease, round spot disease and other early defoliation diseases, it has the following characteristics: 1 early onset and rapid spread. 2 strong drug resistance. After many years of production experience, it has been proved that the Bordeaux mixture has particularly obvious control effects on early defoliation diseases represented by brown spot, but it has almost no bactericidal effect on apple deciduous disease. 3 There are many lesions and there is a phenomenon of expansion joint. In late May, the onset and spread of new shoots, a number of lesions up to a few leaves, weighing more than 10, after the rapid formation of lesions, resulting in a short time leaves dry, fall off. There is a large difference in disease resistance among the 4 varieties. The Marshal is onset and the Fuji Department is light.
2, symptoms. The disease mainly damages the leaves and also harms the shoots and fruits. Leaves are vulnerable to damage within 20 days. Brown spots appear on the leaves at the onset of the disease. There are purple brown halos around. When conditions are right, several lesions are connected, and finally the leaves dry off. When the weather is wet. Black mold layer grows behind the lesion. After the young leaves are infested, the leaves are shrinking and deformed. After the petiole and the tender shoots are damaged, an oval-shaped brown sunken lesion is generated, resulting in easy detachment of the leaves and easy breakage of the twigs and easy drying. When the fruit is damaged in the near mature stage, brown spots appear on the fruit surface, and the fruit suffers. The dark brown mold layer can be expanded to the flesh.
3, the incidence of law. In the middle and early June, the initial infection period of the pathogenic bacteria occurred. The peak period of onset was from July to August, and it was always endangered until mid-October. The occurrence and prevalence of the disease are closely related to climate and species. It is prone to hot and rainy conditions, the drought year in spring, and the delay in the initial period; summer rainfall is heavy and the incidence is heavy. In the apple cultivar, the onset was heavy with the Marshal and the Fuji disease was light. In addition, the weak tree vigor, poor ventilation and light transmission, low-lying terrain, high groundwater level, and tender branches and leaves
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