Melon bacterial angular spot

[Hazards] Muskmelon bacterial leaf spot disease is a bacterial disease that runs through the whole growth period. The incidence of field disease is more important than that of open field. In the southern region, high temperature and high humidity are generally more important than the northern region. Due to the difference in species and rootstock grafting, disease resistance may be different, but once the disease occurs, it will seriously damage the leaves, affect the photosynthesis and induce other pests and diseases.

【Illnesses】 The disease mainly damages the leaves, and it can also damage stems and fruits. Initially, water-stained spots appeared in the leaves and gradually expanded. The veins were restricted to be polygonal or irregular in shape. Sometimes the yellow-white bacilli were spilled from the back part of the disease, and the diseased leaves became brownish and dry afterwards. Lesions become brittle and easy to crack off. The lesions on the vines and fruits showed water stains and dents at the beginning, with a large amount of mucus. The lesions on the surface of the fruit were susceptible to ulceration, and the seeds were brought to the introgression. Melons planted in greenhouses are generally affected near the sheds. Condensate return will cause humidity on the sheds, which is the main cause of the disease. The field should pay attention to distinguish between bacterial and bacterial leaf spot, bacterial leaf blight, bacterial leaf spot lesions were oily, bacillary pus; bacterial leaf blight rarely bacteria pus; bacteria Scars are water-stained, with pus.

[Influence] The disease is caused by bacteria that spread over the winter with the diseased body in the soil or on the surface of the seed. It is invaded by the host's wounds and natural orifices, and transmitted through wind and rain, insects, and agricultural operations. Humid and rainy, high humidity in the field is the main condition for the occurrence of diseases.

【Prevention and Control Methods】 1 Rotation: Non-cucurbit crops should be rotated for more than 2 years. 2 Seed Disinfection: Select disease-free melon seeds and disinfect seed before sowing. Disinfection method is to soak seeds in warm water of 55°C for 20 minutes, or use 300 times of calcium hypochlorite to soak seeds + “Yunda-120” 1500 times 30~60 minutes, remove and wash with clear water, and remove and germinate. 3 Reduce pathogens and reduce humidity. In the field, timely removal of diseased leaves, disease vines and deep burial; timely fertilizer application, scientific and reasonable watering, and greenhouse ventilation shed melons to strengthen ventilation and reduce field humidity. 4Chemical control: It is recommended to start the prophylactic use of the drug in the first stage of the melon, and the agent may be selected from Bisun (20% thiazole zinc SC) 400 times or Bi Rui (40% chlordiazepine SC) 750 times or Krasenycin 700 times. Rungella (20% copper TB) 500 times or Chromium Bromide isocyanurate. Whether it is a systemic fungicide or non-systemic fungicide, it must be carefully sprayed on every part of the plant, especially on the back of the diseased leaf, otherwise even a systemic fungicide will not control the development of the disease.

Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone

Adult Surf Towel Poncho

We are the golden supplier of beach cotton Surf Poncho, surfing change poncho, short sleeve cotton dry robe, Waterproof Change Robe, winter jacket, safety reflective jacket.

Adult Surf Towel Poncho,Beach Change Towel Poncho,Quick Dry Poncho,Adult Towel Poncho

Suzhou Golden Gamrnet MFG Co.,Ltd , https://www.suzhoumfg.com