Willow twig gall midge( Rhabdophaga salics Schrank) occurred frequently and caused heavy loss.

杞柳瘿蚊发生频繁，造成很大的损失。

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“That’s the time wasted above and beyond just being able to make the trip,” said David Schrank, co-author of the report.

“这是浪费了的时间，超出了旅程时间的承受范围，”报告的合著人戴维-施兰克说。

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“That’s the time wasted above and beyond just being able to make the trip,” said David Schrank, co-author of the report.

“这是浪费了的时间，超出了旅程时间的承受范围，”报告的合著人戴维-施兰克说。

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