A: Because of the environmental conditions surrounding the vegetables (such as light, temperature, water, fertilizer, and gas), there are one or more aspects that are abnormal or there are harmful substances (such as factory waste, salinization, harmful gases, etc.), or Inappropriate management measures (such as organic fertilizer is not decomposed, over-ventilation, even after the shade suddenly uncovered the curtain does not back curtain, etc.), so that the growth and development of vegetables is not normal, this phenomenon is a non-invasive disease, that is physiological Disease. Physiological diseases are characterized by the following: 1. Although some physiological diseases are similar to some infectious diseases caused by pathogens, there are no pathogens at the site of the disease and are not caused by biological infestation. Second, can not be infected with each other, no infestation, often occurs in the field a large area, the distribution is relatively uniform, but there is no gradual spread from the point to the process of facing the process, and adjacent plants have more consistent symptoms of the disease. Third, can not use chemical agents for prevention and treatment. Fourth, due to the occurrence of physiological diseases related to environmental conditions and cultivation measures, so their judgments should be carefully examined and analyzed from the irrational part of the disease area and nearby ecological environment, or cultivation management measures. Led Facial Mask,Led Light Facial Mask,Led Therapy Facial Mask,Led Facial Skin Care Mask Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizons.com