萘乙酸和乙烯利对梨树的疏花疏果效应

对10年生梨园在梨树初花期、盛花期和落花期分别喷布不同浓度和配比的乙烯利和萘乙酸，结果表明：乙烯利在初花期使用，疏除效果不明显，盛花期使用200-400mg／L效果好，坐果率达到12％～18％，疏除效果较适宜；2-10mg／L的萘乙酸获得较理想的效果，疏除率达到85％左右；2-10mg／L的萘乙酸与200～400萘mg／L的乙烯利配合使用，疏除率达到80％。正确使用各种化学药剂对鸭梨和雪花梨进行疏花疏果可达到良好效果，省时省工省力，有广阔发展前景，试验结果对指导生产有一定的实际意义。

The Thinning Effects of Naphthylacetic Acid and Ethephon on Flower and Fruit of Pear Tree

Pear trees in the portion of ethephon and naphth 10-year-old pear orchard were sprayed with different concentration and different proylacetic acid respectively at initial flowering stage, full-bloom stage and flower-drop stage. The results indicated that effect of thinning were not obvious at initial flowering stage, so the best time of spraying was full-bloom stage, and that the optimal treatment was 200 -400 mg/L ethephon and the rate of setting fruit were 12% -18%;The rate of setting fruit is as good as the effect of 2-10 mg/L naphthylacetic acid, the rate of thinning was 85%; The rate of thinning was 80% in 2-10 mg/L naphthylacetic acid and 200--400 mg/L ethephone. Therefore, the correct use of chemical agents has better effect of flower and fruit thinning on Yali pear and Xuehuali pear with less time and labor, meanwhile, it has a vast prospect and experimental results have a certain practical meaning in guiding production.