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。
Primary vectors for transmitting phytoplasma are insects feeding on the sap of phloem, such as leafhopper, and psylla.
植原体病原主要依靠吸食植物韧皮部的昆虫介体传播，如叶蝉、木虱等。
These results provide valuable information to develop an integrated pest management program for the common pistachio psylla.
这些结果为建立阿月浑子树木虱的综合防治计划提供了宝贵的信息。
Any of various jumping plant lice of the family Psyllidae, especially of the genus Psylla, which includes several species that infest fruit trees.
木虱一种木虱科植物跳虱，尤指属于跳虱属的木虱，有不少品种是侵害果树的。
The results showed that high temperature was the major meteorological factor that could obstacle the development of Psylla Chinesefrom 2000 to 2002 and in 2010.
结果表明，在2000-2002年和2010年，高温是抑制梨木虱生长发育的最主要气象因子；
The results showed that high temperature was the major meteorological factor that could obstacle the development of Psylla Chinesefrom 2000 to 2002 and in 2010.
结果表明，在2000-2002年和2010年，高温是抑制梨木虱生长发育的最主要气象因子；
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