This kind of aphid height 2 millimeters, take the Japanese giant knotweed as the food.

Several other herbicides, including amitrole, barban, dicamba , and MCPA, alter aphid populations on treated hosts plants.

另一些除草剂, 包括杀草强 、 燕麦灵 、 麦草畏和MCPA, 都能够改变处理寄主上的蚜虫群体.

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Since aphid population may become resistant to organophosphorus compounds, avoid excessive spraying.

因为蚜虫类对有机磷化物能产生抗性, 所以要避免过多的喷洒.

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He used aphid fecundity data to elucidate the theoretical effects of antibiosis on insect population dynamics.

他利用蚜虫繁殖力资料说明了抗生作用对虫口动态的理论效应.

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There is adequate variability in plants to breed for resistance to certain aphid vectors.

植物有充分的变异性可用于培育对一些蚜虫介体的抗性.

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In general an aphid cannot or hardly identify its host at a distance.

在一定距离以外,蚜虫通常不能或难以识别其寄主植物.

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Aphid count on plants in fields do not correlate with virus spread in the same fields.

田间植株蚜数与同块田内病毒的扩散程度间无相关性.

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The aphid is now laying waste to the wheat and barley fields.

蚜虫正在毁掉一片片的小麦和大麦田地。

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Clusters of tiny insects called aphides were to be found on the underside of the leaves.

在树叶阴面,可以发现一簇簇叫做蚜虫的小昆虫.

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Huahua's family supports many aphides, which eat flowers and plants. They gather honey that aphides produce.

原来,花花家族养了很多的蚜虫, 蚜虫吃花园里的花草, 而它们收集蚜虫排出的蜜露来吃.

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Sap passes right through the aphides'bodies, only getting a little thicker and sweeter.

汁液直接流过蚜虫的身体, 结果只是变得更稠、更甜.

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When growing vegetables, one must guard against cabbage aphids.

菜农在种植蔬菜时一定要注意防治菜蚜.

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Chrysopidae and Hemerobiidae ; larvae feed on insect pests such as aphids.

两种薄纱状翅膀的昆虫之一(蛹与褐 蛉 )其幼虫吃诸如蚜虫等的害虫.

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The young beetle larvae can eat hundreds of aphids.

而幼龄瓢虫则可吃掉数百只蚜虫.

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Fungal pathogens are important natural biological control agents of aphids.

病原真菌是蚜虫的重要自然控制因子.

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Viruses are transmitted by VECTORS such as aphids and nematodes.

病毒的传播由传染媒介执行,例如蚜虫和线虫.

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Alternation of sexual and parthenogenic generations , as in some aphids.

有性生殖和无性生殖的交替.

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Certain aphids seem to prefer waxy leaves, whereas other species are repelled by them.

有些蚜虫,看来喜欢有蜡质的叶片, 而这种叶片对另一些蚜虫却有拒避作用.

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Phloem elements and adjacent tissues are the principal feeding sites for most aphids.

韧皮部及其邻近组织是大多数蚜虫的主要取食部位.

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However, reproduction rates of some insects such as aphids are influenced by nutrition.

然而, 一些昆虫的繁殖率,如蚜虫等是受营养影响的.

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Clusters of tiny insects called aphids were to be found on the underside of the leaves.

结果在树叶背面找到成串的叫作蚜虫小虫子.

新概念英语第三册