After entering the rainy season, affected by the high temperature and high humidity weather, the diseased pepper vegetables (both shed and open air) were seriously affected, which caused the rotten fruit and fruit drop phenomenon. Many pepper farmers could not do anything about it. According to the pesticide network , spicy (sweet) pepper rotten fruit is a common symptom of various diseases, but the source of the disease is different, the symptoms are different, and the prevention and treatment methods are different. The following are the causes and prevention methods of rotten fruit for your reference:
The sunburn disease is hot and the weather is sunny. The sun is partially exposed to sunlight, which makes the peel fade and harden, producing gray-white leathery spots. The surface of the disease is thinned and the flesh tissue is necrotic and hard. Later, it is easily infiltrated by other pathogens, and black mold occurs and rots. Prevention: Watering should be done in time to balance water supply and improve microclimate in the field. It is recommended that the vegetable farmers should leave two leaves and then pick the heart when pruning, so that it can play the role of sunshade and reduce the occurrence of diseases.
The umbilical part of the fruit of the rot of the umbilical rot is damaged, and the dark green water-stained spot appears at the beginning and expands rapidly. The diseased part shrinks and the surface is sunken. It often turns black or rots due to parasitic other bacteria. The reason is mainly due to high temperature and drought, insufficient soil water supply, and the imbalance of calcium supply in spicy (sweet) pepper plants, resulting in calcium deficiency in fruits. In addition, partial application of nitrogen fertilizer will also affect the absorption of calcium by the plant, resulting in calcium deficiency in the fruit to produce umbilical rot. According to relevant surveys, the disease is prone to occur when the soil contains less than 0.2% calcium. Control: Spray 1% calcium superphosphate solution or 0.1% calcium chloride solution. In addition, if the diseased part becomes black or rot, it can be combined with black mold or soft rot at the same time.
Soft rot disease is a water-stained dark green spot at the beginning, after the whole fruit is soft rot, with a foul smell, the internal flesh rots, the peel becomes white, and the dried fruit is usually hung on the branches, and falls off after the external force. Control: Spray 72% agricultural streptomycin or 50% DT bactericide or 40% streptomycin sulfate soluble powder or kill or add rufin pesticides , spray once every 7 days, even spray 2~3 Times. In addition, cotton bollworm, tobacco budworm and wind and rain are the vectors of disease. It is necessary to promptly spray the pests with pyrethroid pesticides and take measures to prevent rain.
Most of the diseased fruit is infected from the pedicle, which is a water-stained gray-green lesion, which quickly turns brown and soft. In wet weather, the surface grows sparse white mold layer, and the disease fruit shrinks and does not fall off. Other parts, such as stems and lychee leaves, often have watery brown spots. Prevention and control: At present, the peppers in the seedling stage have many epidemics, and the farmers should pay attention to strengthen prevention and treatment. Can spray 64% anti-virus cockroach and 55% toxic mycorrhizal mixture (15 kg water, 30 grams of each agent), or 58% metalaxyl manganese zinc or 69% acryl manganese or 60% fluoro-manganese Zinc, etc., spray once every 7 days, even spray 2 to 3 times.
Botrytis cinerea and sclerotinia sclerotiorum gray mold disease have more incidence of pepper and pepper. On the top or pedicle of young fruit, there are brown water-stained lesions, which are rotted and dark brown. Gray mold layer appears on the surface. Sclerotium disease develops from the fruit stalk to the whole fruit, which is watery and rot, light gray-brown, and has similar symptoms in other parts. These two diseases occur mostly in the low temperature and high humidity period in winter, but in summer, the open-pit cultured spicy (sweet) pepper occasionally occurs even in cloudy days. China Pesticide Network recommends: open-air cultivation can choose spray speed Klein, sclerotium net or 50% keeling and 70% methyl thiophanate mixture (15 kg water, two drugs each add 15 grams), or 40% bacteria The nuclear cleansing solution is mixed with 50% of the seawater (15 kilograms of water, 15 grams of the two agents), and sprayed once every 5 days during the onset period, even spraying 2 or 3 times.
The anthracnose fruit is susceptible to disease when it turns red. Initially water-stained yellow-brown round spots, central gray-brown, with a slightly raised concentric wheel pattern, often dense with small black spots. When wet, the surface of the lesion often overflows with red sticky material; when dry, the diseased part shrinks into a film shape, which is easy to break and expose the seed. The leaves are infected, and the water spots are green spots at the beginning, and then become brown spots with a brown edge and a light gray at the center. Control: Optional spray chlorothalonil, new Wansheng, spray once every 7 days, even spray 2 to 3 times. The fruit of the rot of the cotton rot disease is rotted, and when the humidity is high, a large amount of white mold is born. Control: Spray 50% DT bactericide or 14% lycopene copper water, spray once every 7 days, even spray 2 or 3 times.
Black mold disease rotten fruit The disease generally occurs on the top of the fruit first, and some begin to develop from the fruit surface, and the color of the initial disease part becomes shallow. The fruit surface gradually shrinks and is accompanied by a black-green mold layer, which occurs mostly when the fruit is near maturity or after maturity. Control: Spray 50% DT bactericide 500 times solution or 58% metalaxyl manganese Zn 400 times solution, spray once every 7 days, even spray 2 or 3 times.
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