It should be caused by poor environmental conditions and improper management, such as black mulch exothermic high temperature baking, if there is ammonia fumigation, it will aggravate the symptoms. In addition, frequent spraying of pesticides will cause slight phytotoxicity and accelerate leaf aging and yellowing spots. In view of this situation, vegetable farmers should water, let the air cool down in time, apply boron-calcium fertilizer plus amino acid, alginic acid, fish protein fertilizers, properly mix and add balanced fertilizers, spray head-lifting agents, and appropriately mix amino acids. Or alginic acid foliar fertilizer, the effect is better. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone GMP Certificated Immune Globulin Injection Supplier in China Hepatitis B Immunoglobulin,Hep B Immunoglobulin,Hepatitis B Immunoglobulin Vaccine,Hepatitis Immune Globulin FOSHAN PHARMA CO., LTD. , https://www.pharmainjection.com