Apple tree leaves are susceptible to drooping, curling, withering, and even falling off due to high temperature. In response to this question, the reporter interviewed Li Bingzhi, a professor at the College of Horticulture of Northwest A&F University. He said that it is necessary to respond scientifically to this problem and avoid high temperature hazards.

When the irrigation is timely, the irrigation can be carried out in small amounts to keep the soil moist. You can also spray the water on the canopy several times before 9:00 am or after 4 pm to reduce the fruit drop caused by high temperature and water shortage.

Water conservation in the garden will make full use of straw, weeds, etc. to cover the orchard. If the weeds in this period are overgrown, do not carry out weeding work, use weeds to cover, retain water and slow down the evaporation of water. Water-retaining agent can also be used, 150 g/tree for large trees and 50-100 g/tree for small trees. Li Bingzhi said that it is better to cover a layer of mulch at this time to ensure better water retention. The water retaining agent can provide water for the fruit trees slowly after expansion.

Timely fattening Li Bingzhi said that long-term high temperature and drought will cause the tree to weaken and the fruit water content is small. After the drought is relieved, 0.2%~0.4% potassium dihydrogen phosphate should be sprayed in time to increase the potassium content of the tree. Li Bingzhi also suggested that in case of a small amount of rainfall, the fruit farmers should immediately apply nitrogen fertilizer once again to restore the tree potential and prevent sudden heavy rains after the drought, causing a large number of cracked fruits.

After preventing high temperature and drought of pests and diseases, the fruit trees are generally weak, which may lead to the occurrence of pests and diseases. According to the law of disease occurrence of different fruit trees, carbendazim, methyl thiophanate, chlorhexidine, brooming net, Avi can be sprayed once in time. Phytocin, triazole tin and other agents to prevent the occurrence and harm of pests and diseases, to avoid causing early leaves, so that the tree potential will recover as soon as possible.

Pruning the fruit trees when the high temperature and drought are properly trimmed will increase the wounds of the branches and increase the transpiration of the trees, thereby increasing the high temperature hazard. Li Bingzhi also reminded fruit farmers, but some pruning, weak branches, long branches, etc. should be pruned. When pruning, they should be as short as possible and should not be re-cut to ease the tree potential and reduce the consumption of water by vegetative growth. At the same time, in the growing period of the fruit tree, the excess germination can be wiped out in time, and the excess branches can be removed to reduce the number of branches and leaves, reduce the transpiration of water, prevent excessive evaporation and burn of the leaf surface water, and slow down the effect of drought on the fruit.

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