Study showed that insect entered in the bags is the main reason, especially Pear psylla and Pear phylloxera.
研究发现，果面黑点的形成有多种原因，最主要的是梨黄粉蚜和梨木虱等害虫入袋为害造成的。
Study showed that insect entered in the bags is the main reason, especially Pear psylla and Pear phylloxera.
研究发现，果面黑点的形成有多种原因，最主要的是梨黄粉蚜和梨木虱等害虫入袋为害造成的。
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