The occurrence of the disease and control methods.
1 Injury mainly affects the fruit, and the incidence of fruit in mature period reaches a peak, which can also damage the leaves and shoots. Lesions are red-brown, round, 1 to 6 mm in diameter, usually 2 to 3 mm, and later lesions turn reddish-brown or dark brown, the edges of the lesions bulge, the middle of the depression, and gray-brown to gray, with small black spots, serious The sick fruit falls early and the storage period continues to develop. The diseased part is susceptible to saprophytic infection and causes decay.
2 Pathogens and Occurrence Black spot disease is a disease of the fungus Subgenie fungus. The pathogenic bacteria live in the diseased part of the winter through wind and rain and insects. The pathogenic bacteria infecting young fruit at the flowering stage began to develop symptoms at the end of July and early August, and was most severe from late August to late October. High temperature is the dominant factor in the induced scab. Therefore, the onset is heavier under conditions of high temperature and high humidity or canopy closure. Fruits on the periphery of the crown and in direct sunlight (such as sunburn) are more common. The incidence of leaves is earlier than the incidence of fruit, and early maturing grapefruit is 10 to 15 days earlier than the incidence of Shatian pomelo.
3 Prevention and control measures In winter, the clear gardens cut off diseased foliage, eradicated all weeds in the garden, and burned in a concentrated manner, and then cleared the garden with lime sulfur, pineine mixture or Bordeaux mixture. On the cultivation and management, a reasonable ratio of nitrogen, phosphorus and potassium fertilizers to improve the disease resistance of the tree. The canopy should not be excessively bald and transparent when trimmed to reduce direct sunlight and reduce the incidence. After Xiehua must be applied for protection, once every 10 days or so, 3 times in a row to prevent fruit from being invaded. Can be combined with disease prevention drugs later. The commonly used pharmaceuticals include 50% thiotrexate 500 times, 80% dexamethasone 500 times, 80% M-45 500 times, 50% thiophanate-methyl 500 times and 10% 1500 times.
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