Causes and Control of Flower and Fruit drop of Schisandra chinensis

First, the reasons for falling flowers and fruits

The main results are as follows: 1. Low temperature freezing injury causes falling flowers. The last frost period occurred in the middle of May in some areas in the east, and the cold air mass caused physiological chilling injury and caused some flower buds to fall off.

2. The drift of herbicide causes falling flowers. Field herbicides are mostly used at the end of April and the beginning of May, when Schisandra chinensis is in bloom. The drift of herbicides directly harms the petals of Schisandra chinensis, so that the female flowers can not be pollinated normally, resulting in falling flowers.

3. Fruit drop caused by diseases and insect pests. The main diseases are root rot, leaf blight and powdery mildew, which cause fruit drop when the disease is serious; insect pests mainly include leaf rollers, foam cicadas, Tianmu insects and so on, which occur from May to August, and directly damage the fruits when they are serious.

4. Fruit drop is caused by the imbalance of water and fertilizer management. Spring and autumn droughts often occur in various places, but Schisandra chinensis without irrigation facilities is difficult to survive. Drought and de-fertilization make the phenomenon of fruit drop more prominent.

5. Fruit drop caused by environmental pollution. It is mainly the waste gas emitted by chemical enterprises, which often produces diseases after the occurrence of acid rain, and the prevention and control does not cause fruit drop in time. Smoke emitted from coal-fired boilers can also cause carbon poisoning in Schisandra chinensis fruits.

II. Measures to prevent and control falling flowers and fruits

The main results are as follows: 1. for chilling injury, prevention should be given priority to, and the method of releasing smoke can be taken according to the weather forecast, and the cultivation of strong seedlings and timely irrigation can be adopted to reduce freezing injury.

2. For the harm of herbicide drift, the government should start from the source. The government can formulate village rules and regulations prohibiting the use of herbicides within 2000 meters around Schisandra chinensis, and set up warning signs. Once the drug damage occurs, it should be sprayed to alleviate the damage. Such as spray effect + brassine or Xianu, Fuer 655, etc., can alleviate the damage symptoms.

3. Timely prevention and control of diseases and insect pests should be taken, and disease prevention and comprehensive control measures should be taken. When root rot occurs, root rot can be irrigated with 50% carbendazim wettable powder or 1000 times methyl thiophanate wettable powder; for leaf blight, 1000 times of methyl topiramate wettable powder or 1000 times of mancozeb wettable powder and 3% Jingangmycin can be used to control leaf blight. Spraying 2.5% deltamethrin EC 3000-4000 times or 40% omethoate EC 1000-1500 times can be used to control leaf rollers, foam cicadas and sky flies.

4. strengthen field management, equipped with micro-spraying and drip irrigation facilities, combined with topdressing for irrigation. Topdressing should be based on compound fertilizer and special fertilizer, and trace elements such as iron, zinc and selenium should be properly supplemented to ensure adequate nutrient supply.

5. The construction of Schisandra chinensis Garden should be far away from industrial pollution areas and highways. According to the standard of pollution-free production, cultivation techniques should be standardized to reduce the use of pesticides and chemical fertilizers as much as possible. The diseases caused by acid rain should be controlled in time to ensure the goal of high yield, high quality and high efficiency.