Fruit bagging can reduce preharvest fruit drop of crisp pear.

Fruit bagging is an effective technical measure to produce pollution-free fruit at present. The practice of popularizing fruit bagging of crisp pear in Pucheng pear area of Shaanxi province shows that bagging can improve the appearance of fruit, make the fruit surface clean, have few fruit spots, have no pear spots, reduce pesticide residues and improve commodity and commodity rate. In addition, bagging can also reduce pre-harvest fruit drop.

On August 21, 1993, a strong wind of about 0.5 hours occurred in Longyang area of Pucheng County, and the fruit of the general orchard fell off seriously. After the gale, the author investigated the bagging demonstration garden, the average shedding rate of control trees was 4.1%, and the average shedding rate of bagged trees was 0.3%. It is only 7.3% of the control tree. From 14:00 to 15:00 on September 13, 1999, a strong wind of magnitude 7 to 8 occurred in Pucheng County. A large number of ripe apples and crispy pears fell off in the county, resulting in a loss of more than 100 million yuan. After the disaster, the author investigated more than 20 pear orchards in 10 townships and found that the shedding rate of unbagged fruit was 52%-73%, while that of bagged fruit was 21%-32%, which was 1.47% 2.28 times lower than that of unbagged fruit.

The reasons for the reduction of late fruit drop by bagging need to be further studied, but the effect of fruit bagging is reduced and the late shedding of crisp pear is very obvious, which should be paid attention to when popularizing fruit bagging of crisp pear.