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梨果实套袋除可改善外观、降低农药残留、提高商品果率外 ,还能减轻采前落果。1993年 8月 2 1日蒲城县龙阳乡发生半小时左右的 5～ 7级大风 ,风后对酥梨品种调查 ,套袋树平均落果率为 0 .3% ,而未套袋树为 4 .1% ;1999年 9月 13日 14～ 15时 ,蒲城全县发生 7～ 8级大风 ,风后对
In addition to improve the appearance of pear bagging, reduce pesticide residues, improve the commodity fruit rate, but also reduce the harvest before falling fruit. On August 21, 1993, Long Yang Township, Pucheng County, occurred about 5 to 7 winds of about half an hour. After the wind survey on the varieties of crisp pear, the average fruit drop rate of bagging trees was 0.3% 4 .1%; September 13, 1999 14 ~ 15, Pucheng county occurred 7 to 8 gale, the wind after the