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。

There is no phylloxera ( yet ) in Chile or South Australia , but quarantine and constant vigilance are the price .

尽管智利和南澳尚无葡萄虫迹象（或有但没发现），但得掂量掂量隔离检疫与持续警戒带来的损失。

The grape is the fruit preferences , but serious grape phylloxera , has been identified as the main quarantine objects at home and abroad .

葡萄是人们喜好的水果之一，但葡萄根瘤蚜危害严重，已被列为国内外主要检疫对象。

It was concluded that all cultivars tested were susceptible to grape phylloxera , and thus resistant rootstocks were necessary in the phylloxera epidemic region .

由此可见，我国供试栽培品种均不抗根瘤蚜，在根瘤蚜疫区需要用抗性砧木嫁接苗建园。

The development of wine making in Sardinia-here as it was everywhere else-was stopped with the arrive of phylloxera : only the vineyards planted in sandy soils could be saved .

在撒丁岛的发展在酿酒-在这里，因为这是其他任何地方-是停止与到达的根瘤蚜：只有葡萄园种植在沙质土壤中可以保存。