Judging from the problems of bagged apples in recent years, black spot disease has been the most serious, regardless of whether it is a paper bag or a plastic film bag. In the early stages of the development of black spot disease, needle-like black spots appeared around the fruit pods, and the diameter of the black spots gradually expanded, such as large sesame seeds and some like mung beans. Lesions only occur on the epidermis of fruit, taste no bitter taste, do not cause flesh ulcers, and do not spread during storage. There are also some diseases similar to black spot disease, and the fruit grower must distinguish between them. Some black spots are distributed around the upper part of the loquat and around the top of the fruit, and there are also spots on the loin that become larger spots as soon as the black spots occur. They only harm the cortex, taste bitter, and do not cause flesh ulcers, which are later in growth and storage. The dark spots are enlarged and slightly sunken. This disease is caused by calcium deficiency caused by pox spot disease, and when serious and acne disease concurrent. Some light brown spots are irregularly distributed on the fruit surface. When the lesions are large, the diseased area is festered and spreads quickly, which can cause the whole fruit to rot, and the mouth of the disease tastes sweet. This is the phenomenon of rotenus rot. Some fruit spots are rough and cracked, showing black spots, mostly caused by copper-, manganese-, or emulsion-type drugs. Black spot disease mainly occurs from late June to late July, and the onset of the rainy season is at its peak. The orchards with heavy weather, low topography, canopy closure, vigorous tree vigor, and more nitrogenous fertilizers are more severe. According to the latest research, the source of black spot disease in apple bagging is Alternaria and Pink Trichothecene. The pathogens of black spot disease are basically the same as pathogens of apple mold disease and spotted leaf disease. Bagged fruit is heavier than black spot disease. Black spot pathogens are weak parasites and generally do not infect the fruit surface. The bagged fruit is in the condition of high humidity, poor ventilation, and high temperature, which can easily cause the pathogenic bacteria to spread. Whether it is a paper bag or a plastic film bag, the water in the bag after raining can not be eliminated quickly. After the paper bag is wet for a long time, or if the bottom corner of the bag bottom is not opened, it will increase the occurrence of black spot disease. It is the most critical to prevent and cure the apple black spot disease. Can be used polyoxin, agricultural resistance 120, bacteria off, etc., after the flowering and bagging before spraying 2 to 3 times. If sprayed with Tai Sang Health Co., Ltd. and other chemical bactericides such as mancozeb, the spray will not work. Thiotropine and other osmotic bactericides are effective against ringworm rot disease and are not effective against black spot disease. Bordeaux fluid and other copper-containing fungicides are not suitable for use before bagging, and are not effective against black spot disease. The efficacy of fungicides is generally about 10 days, and the interval between spraying before bagging should not exceed 10 days. Do not spray any poisonous agents after bag removal.
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