Recently, many fruit areas across the country have continued to rain in spring, because many fruit areas are catching up with the critical period of pollination and fruit setting during the flowering period. This spring rain has severely affected the pollination and fruit setting of fruit trees while replenishing water for the orchard. The corresponding follow-up measures will have a greater impact on this year’s apple output and quality.
Impact on pollination
1. Affect the pollination activities of bees. When the temperature is lower than 18℃, the pollen collection activity of the bees is reduced, and when the temperature is lower than 16℃, the pollination activity of the bee colony will be completely stopped. 2. Affect the germination and growth of pollen. The low-temperature rainfall slowed down the development of pollen, making it difficult to provide mature pollen for pollination. At the same time, for the flowers that have been pollinated, the elongation of the pollen tube is also seriously affected in this low-temperature rainfall environment. 3. Wash off the mucus on the stigma. The pollen that falls on the stigma can continue to germinate and grow pollen tubes only when stimulated by the mucus on the stigma. This rain will wash away or dilute the mucus on the stigma, and ultimately fail to complete fertilization, resulting in failure to set fruit.
Remedy
1. After the rain stops and clears, the artificial pollination should be carried out to increase the pollination rate of the flowers. If time is tight, increase the number of bees and complete the pollination before the effective pollination time is over. (The effective time of pollination is mainly concentrated within four days after the flower blooms, and the pollination effect on the day the flower blooms******)
2. After the rain stops, spray 0.3% borax solution in time, add one pound of borax and one pound of urea to 330 kg of water, and add 1000 times the penetrant, spray immediately after preparation to improve the effect of pollination.
3. When the flower fades 70%, spray Dalu (Brassinolide 0.01%) 3000 times and Hualiankang (compound oligosaccharide trace element complex) 1000 times in time. After experiencing the early low-temperature frost and this low-temperature rainfall, most of the pollen and internal sex cells and organs of the flower are damaged. Even if the pollination is completed and the fertilized flower is completed, it is difficult to form high-quality fruits due to the damage of its tissues, and it is easy to fall in the later period. phenomenon. At this time, spray Dalu plus Hualiankang to quickly recover the injured tissues, increase fruit setting rate and improve fruit setting quality.
In addition, it is necessary to pay attention to the prevention and treatment of brown spot, mildew, and black spot. For this reason, when the flower fades 70%, Shiliang (Difenoconazole) plus Jinggang pyriside (a combination of Jinggangmycin and pyrimidine nucleoside antibiotics) should be sprayed in time to effectively prevent and treat brown spot, Mildew heart disease, black spot disease.
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