What causes kiwifruit drop?
During the growth and development of kiwifruit, flower and fruit drop often occurs. This situation can seriously affect kiwifruit yield and is also a very distressing thing for fruit growers. So why does kiwifruit experience flower and fruit drop? Below, the editor will talk with everyone about the causes of kiwifruit drop.
1. Abnormal climate
Fruit drop caused by abnormal climate generally occurs after flowering, and flower drop also occurs along with fruit drop. This is because kiwifruit is most sensitive to weather and climate during pollination. 15-28°C is the most suitable temperature for kiwifruit pollination and fertilization. Below 15°C or above 28°C will affect its pollination. The suitable humidity is above 55%, but if the pollen encounters water, it will rupture and be unable to pollinate.
2. Poor pollen quality
Kiwifruit pollen can only be used when its germination rate is higher than 30%. However, many fruit grower friends use different pollen, and the quality varies greatly. Most are below 30%. Experiments have shown that when the pollen germination rate is below 30%, it will lead to poor pollination between kiwifruit and cause fruit drop.
3. Excessive nutrients
Many fruit growers spray pesticides and water during the kiwifruit flowering period, but if fertilizer and water are excessive, it will cause kiwifruit to have excessive nutrients and become too heavy. The branches cannot bear the weight, resulting in fruit drop. However, during normal flowering and fruiting, it is still necessary to ensure that kiwifruit has sufficient fertilizer and water supply.
4. Fruit drop from disease
During the growth and development of kiwifruit, there are also many diseases, such as sclerotinia rot and gray mold. These diseases harm the fruit and fruit shoots to varying degrees, causing the fruit to rot and the branches to turn yellow and withered, leading to fruit drop.
5. Fruit drop from pesticide damage
The flowering and fruit-setting period of kiwifruit is the period when it is most sensitive to the external environment. If pesticides are used improperly, it will directly harm the flowers and fruit. Many people, when preventing and controlling some diseases such as flower rot, and some leaf diseases, do not control the pesticide dosage well. Also, for convenience, they mix all fungicides, insecticides and other pesticides together, causing fruit drop.
6. Improper management
In many cases, under the same environment, some orchards have very severe fruit drop simply because daily management has not been done properly. For example, excessive fertilization and unreasonable formulation. Too much plowing damages the roots, and branches and leaves are too dense, resulting in poor ventilation and light penetration, and so on. These problems are all causes of fruit drop.
Kiwifruit is most sensitive when fruiting, so attention should be paid to its care, and try not to spray pesticides during the fruiting period. Manage the ventilation, light penetration and drainage in the orchard well. The above are the causes of kiwifruit drop compiled by the editor. If you want to know how to solve fruit drop, please continue to follow Qinnong.com.