Prevention of deformed fruits of strawberries

The main reason for the occurrence of strawberry abnormal fruit is poor pollination and fertilization, but the degree of occurrence is related to variety, flower grade, flower visiting insects, temperature and humidity, flowering spraying and other factors. Therefore, the following countermeasures should be considered to prevent the occurrence of strawberry malformed fruit in production.

Due to the difference between male and female fertility of strawberry, the varieties with large amount of pollen should be selected as pollination varieties and mixed with the main varieties. Baojiao Zaosheng, Chunxiang and other varieties are rich in pollen. Yantai greenhouse strawberries, the main varieties are Baojiao Zaosheng, pollinated varieties are Chunxiang, Fengxiang, etc., pollinated varieties account for 5%-10%, which can effectively reduce the rate of abnormal fruit. Strawberries cultivated in protected areas with beehives in the shed bloom early, and there are few flower-visiting insects in the early stage, so it is best to place beehives in protected areas. This method has been widely used in Japan and the effect is very good. Bees usually fly a distance of 400 meters. The visiting time is from 8: 9 a.m. to 3: 4 p.m., and the active temperature range is generally 15: 30 ℃. Other flower-visiting insects should also be protected and utilized. The temperature and humidity in the ground should be strictly protected during flowering. The temperature should be controlled at 20-28 ℃. It is necessary to release the air at the right time to cool down the temperature and humidity. The use of drip-free film can prevent the influence of water droplets. Drip irrigation can effectively reduce the air humidity in the protected area. Flowering period as long as the surface is not dry, generally do not need irrigation. Flower thinning and fruit thinning to remove advanced secondary flowers prone to female sterility can significantly reduce the rate of abnormal strawberry fruit, concentrate nutrients and improve single fruit weight and fruit quality. In order to reduce the number of times of drug use, comprehensive measures based on agricultural control should be adopted for the prevention and control of strawberry diseases and insect pests in protected areas. If the diseases and insect pests are more serious, you should pay attention to the use of drugs before or after anthesis. Artificial pollination at 11: 12 noon anther cracking peak, the use of artificial breeze (with fans, etc.) artificial pollination, also has a good effect.