When did catkins begin to float? When did catkins begin to float?

1, catkin flying time is about April-May, late spring and early summer. In addition, the flying time of catkin is closely related to meteorological conditions such as region, temperature and light. Due to the south latitude and high temperature in Jinan, Zhengzhou and Shijiazhuang, the catkin flight time is earlier than that in Beijing, and the catkin flight time in Beijing is generally from April 15 to May 15. For asthma patients, more attention should be paid to protection. The sheep in Shijiazhuang entered the peak period on April 9th, and the sheep in Jinan and Zhengzhou also began to fly around Tomb-Sweeping Day. There are two "Mao Mao showers" in Nanjing every year, namely, the bud stage in March-April and the ear stage in April-May. Generally, the flower buds begin to smell fragrant at the end of March, and the fruit groups last from April to May, and March-April is the crossing period.

2. Oily and polysaccharide substances contained in catkins will be digested by nasal secretions after being inhaled, and then more than ten kinds of antibodies will be released. If this antibody meets the invading pollen and accumulates in large quantities, it will cause skin allergy. According to expert research, there are two main reasons for catkin allergy. On the one hand, due to the improvement of living standards, a large number of high-protein and high-calorie diets such as eggs and meat products are ingested, and people's ability to produce antibodies is enhanced. Therefore, allergic reactions are more likely to occur when encountering antigens such as pollen. On the other hand, due to air pollution, water pollution and the extensive application of food additives, the human body is exposed to more antigenic substances, which promotes the occurrence of allergic diseases.