The fruit tree draw refers to the fact that the fruit trees in the late winter and early spring are dehydrated and wrinkled and drained. Generally, they occur more on the annual branch. As the age of the branches increases, the rate of drawing decreases. The occurrence of pumping was caused by the imbalance of water balance in the shoots, that is, the increase of temperature in early spring, the increase of air dryness, the early release of young shoots, the increase of water transpiration, the slow rise of ground temperature, the low temperature, and the weak root absorption. Causes the branches to drain and drain. Of course, the occurrence of pumping and winter temperatures is too low, and the relationship between temperature rise and overheating in early spring is extremely significant. Slugs occur in apples, pears, peaches, and grapes. Adult trees are light and saplings are heavy; in the same tree species, there is a great difference in the degree of drawing between the varieties. For example, Golden Delicious and Fuji varieties in apple are drawn heavily; Qin Guan, 9th Hokkaido, and New World varieties are lighter.
Measures to prevent fruit trees from drawing are as follows: 1. Underground measures: including pre-winter deep-turning, ground coating, tree-covered grass and earth-cultivation. In the past, it was advocated that the irrigation and drawing of winter irrigation water, but 1 to 3 years old winter sapling irrigation should be early in November, late in the winter, the ground temperature is low, the warming is slow, pumping but increased. 2. Ground-based measures: The use of chemical control is also very good. In recent years, high fat film and carboxymethyl cellulose have been used, but the spraying time, frequency and concentration should be paid attention to. Spray Beijing B2 effect is also very good. Pharmacy control spraying time should start from the middle and late February, until the end of March, the effect will be affected too early and too late. It is advisable to spray 2~3 times in general, and it is required to spray evenly and not to leave branches. 3. Above-ground and underground comprehensive prevention and control measures: Preventive pumping shall be integrated prevention and control, combined with ground and underground, and agricultural measures shall be combined with agent spraying. Juvenile orchards should be checked early and timely. It's too late to smoke after the pumping occurs.
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