What are the hazards of continuous rain?

Even rainy days have advantages and disadvantages. If there is continuous rainy weather after less rain and drought, it will be beneficial to agricultural production and alleviate drought in a certain period of time. However, the soil is too wet on rainy days, the air is too wet for a long time, and the sunshine is seriously insufficient, which often causes poor crop growth and seriously affects the yield and quality. The degree of damage varies with season, duration, temperature, previous rainfall, crop species and growth period. For example, continuous rainfall in the lower reaches of the Yangtze River in spring, due to insufficient light, will occur three wheat waterlogging and cotton seed rot. In the harvest season, continuous rain can make rape, barley, rice, peanuts, etc. germinate and mold, and cotton bolls rot and harden; Sweet potato rot, etc. In addition, due to continuous rainfall and excessive humidity, some crop diseases and insect pests will occur and spread. Continuous rain often occurs in spring in southern China, autumn in Jianghuai area, late spring and early summer in North China Plain and autumn in South China. From the first ten days of June to the first ten days of mid-June, 1989 continuous rainy weather occurred in most parts of North China Plain, which caused mildew and germination of wheat at harvest time, causing great losses. Long-term continuous rain not only causes serious harm to agricultural production, but also easily leads to geological disasters, and also has adverse effects on open-air production enterprises such as water conservancy, transportation and construction. In addition, it is easy to cause the epidemic of human and animal diseases and affect people's daily life. From April 15 to May 15, 2002, there was a rare continuous rainy weather in Wuxi, which lasted for 24 days and had a great impact on the growth and development of wheat. Wheat scab occurred seriously, the grain was not full, the 1000-grain weight decreased greatly, premature aging and death occurred, and the yield and quality of wheat decreased obviously in that year. Due to the rainy and cold weather that lasted for more than a month, the number of hospital patients also increased significantly, some power supply lines failed, and some residents got water in their homes; More than 60 traffic accidents have been caused by slippery roads.