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对套袋鸭梨果面黑点产生的原因进行了较为系统的研究。结果表明 ,套袋鸭梨果面可出现 3种不同的斑点 ,即黄粉虫为害造成的斑点、梨木虱及其粘液造成的斑点 ,另外还有一种黑点。这种黑点产生的主导因素是高湿度和梨果实袋的通透性能差。经保湿 ,在 3～ 17d内可使 10 0 %梨果产生黑点 ;通透性差的药蜡梨袋黑点果率达 2 7 0 9% ,为对照袋的 18 3倍。
The reasons for the dark spots of bagged pear were systematically studied. The results showed that three different spots were found on the bagged pear fruit surface, namely the spots caused by the damage of Tenebrio molitor, the spots caused by pear lice and its mucus, and another kind of black spots. The dominant factor of this black spot is the poor permeability of high humidity and pear fruit bags. Moisturizing, 10 ~ 10 d pear fruit can produce black spots within 3 ~ 17d; poor permeability of wax pear fruit black spot rate of 2 7 0 9%, 18 3 times the control bag.