Cause of fruit drop 1. Inappropriate selection of varieties The selection of varieties should be based on local conditions, select the varieties suitable for the local climate and soil conditions. Generally, thin shell varieties with strong growth, strong stress resistance, high quality and high yield should be selected. 3. Insufficient nutrients Due to insufficient fertilizers, the consumption of nutrients during the flowering period is large, resulting in nutrient deficits and weaker tree vigor resulting in fruit drop. 4. The lack of trace elements When the walnut orchard lacks boron, zinc deficiency, lack of copper, it is also prone to fruit drop. 5. The use of too much nitrogen fertilizer or partial application of nitrogen fertilizer using too much nitrogen fertilizer or partial nitrogen fertilizer, resulting in excessive tree vigor, resulting in loss of balance of vegetative growth and physiological growth, resulting in falling flowers. Fruit drop prevention measures 1. Timely top dressing, strong tree vigor. Generally should be in the fall and spring fertilizer, once per acre should be applied to 1,000 to 1,500 kilograms of soil miscellaneous fertilizer. According to the age of the walnuts, each tree should also be topped with 1 to 1.5 kg of no-tillage fertilizer or common NPK fertilizer. Before and after flowering, the leaves were sprayed with 1 to 2 times 4000 times liquid Shuofeng 481 plus 1000 to 1500 times liquid available boron. After the use of available boron, it can effectively prevent the buds caused by lack of boron in the walnut tree without flowers, flowers, not real, bad, fruit drop, fruit malformation and other undesirable phenomena. 2. Strengthen prevention and treatment of anthrax To prevent rotten fruit or fruit drop caused by anthrax, it can be sprayed once every 400 to 600 times in the middle of May, early June and early July (80% mancozeb) At the same time plus 4000 times liquid Shuofeng 481 to be prevented. Carbon Molecular Sieve,Cms Carbon Molecular Sieve,Carbon Molecular Sieve For Nitrogen Generator,Carbon Sieve Hangzhou Zhongju air separation equipment manufacturing Co., Ltd , https://www.hzzjkfzz.com
2. Flowering in the rain or suffering from low temperatures, resulting in poor pollination of young fruit without fertilization generally occurs in 20 days after flowering fruit drop, which is one of the main reasons causing a large number of walnut fruit drop.
6. Diseases and Insects Caused by Fruit Dropping The main disease of walnuts is anthracnose, which mainly damages fruits and directly causes fruit rot, causing fruit drop.