Why Strawberries Have Malformed Fruit
Strawberry malformation causes
Climate temperature and humidity are the main factors affecting the occurrence of abnormal fruit in strawberry. The flowering period of strawberry was continuously cloudy or the air humidity was too high, which led to the obstruction of anther cracking and poor pollen transmission, which affected the stigma of the pistil and resulted in fruit deformity. In addition, the lack of light due to low temperature and overcast rain causes poor pollen development and low germination rate, which affects the development of insemination pollination and fruit, resulting in the formation of abnormal fruit. In the cultivation of facilities, the strawberry flowering period coincides with the winter and early spring. Low temperature, heavy rain, and lack of light are the main phenological factors for the formation of abnormal fruit.
Variety Characteristics The difference in pollen germination rate among different varieties of strawberry shows a large difference in the rate of abnormal fruit. The varieties with high pollen germination rate, such as Zhang Ji, Tong Zi No. 1, All-Star, Feng Xiang, etc., have a low rate of malformation, while those of Shuo Feng and Shuo Mi have a high rate of 30%, and the inflorescence sequence is too high. Different, uneven distribution of nutrients, higher rate of abnormal fruit, such as Jin Xiang, Chun Xiang and other varieties. In addition, varieties with poor resistance to disease will also aggravate malformed fruit after infection at the flowering stage.
Diseases and insect pests and improper use of pesticides Diseases such as powdery mildew, gray mold, and verticillium wilt caused by various diseases during strawberry cultivation, such as powdery mildew, gray mold, and verticillium wilt, can cause photosynthesis and nutrient metabolism to be impeded, and insect damage such as mites and Spodoptera litura cause mechanical damage to the plants. , resulting in varying degrees of abnormal fruit. Improper drug control not only fails to control insect pests effectively, but also causes toxic and side effects on strawberries, resulting in impaired pollen development and reduced pollen germination rate, thereby greatly increasing the occurrence of malformed fruit, especially with excessive pesticide concentrations and flowering periods. , Improper use of drugs during the fruit period is most affected.
The cultivation and management of the plots with excessive planting density and poor ventilation and light transmission are serious. Insufficient application of organic fertilizer, partial application of nitrogen fertilizers, which lead to long branches and leaves, excessive luxuriant growth, and low surface inequality combined to form a closed microclimate with high temperatures, which can easily aggravate malformation.
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