The population of the spruce budworm, the warbler's favorite prey in North America, has been dropping.
北美莺最喜欢的猎物云杉芽虫的数量一直在下降。
A larva of several tortricid moths, especially the spruce budworm, that devours plant buds.
一些卷叶蛾的幼虫，尤指云杉芽虫，吞食植物的幼芽。
The moths also look the same at first glance, and Miller says this drawer holds nothing but a single species of spruce budworm, an infamous pest of eastern forests in North America.
第一眼瞥去，这些蛾也长得完全一样，Miller说这个抽屉内仅有一种云杉蚜虫——北美洲东面树林内一类不知名的害虫。
In Maine Daniel Jennings of the u. s. forest service has enlisted spiders in the war against the spruce budworm the northeast's most devastating enemy of spruce and fir forests.
在缅因州，美国林业局的丹尼尔·詹宁斯征募蜘蛛来与云杉芽卷蛾——东北部云杉和冷杉林最凶恶的敌人——作战。
In the forests of New Brunswick, for example, various pesticides have been sprayed in the past 25 years in efforts to control the spruce budworm , an economically significant pest.
例如，在NB的森林里，过去的25年里，多种杀虫剂被喷洒以控制云杉蚜虫，一种经济上严重的病害虫。
In the forests of New Brunswick, for example, various pesticides have been sprayed in the past 25 years in efforts to control the spruce budworm , an economically significant pest.
例如，在NB的森林里，过去的25年里，多种杀虫剂被喷洒以控制云杉蚜虫，一种经济上严重的病害虫。
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