这种黄色的花是昆虫的天敌。
是昆虫的天敌，人类的朋友。
“蜘蛛是昆虫的天敌，有了它能避免农民大量喷洒杀虫剂”，雷诺兹说。
"Spiders are key predators of insects and can alleviate the need for farmers to spray large quantities of pesticide," Reynolds said.
大树的特殊天敌是昆虫和树木疾病。
因为这种特别的昆虫是入侵生物，所以它们本身在当地没有天敌，没有能有效控制它们数量的天敌。
And so this particular insect, because it is an invasive, it has no native natural enemies per se. It has no natural enemies that are really very effective at controlling populations of this insect.
结果表明：咀嚼害虫、刺吸害虫、捕食性天敌以及中性昆虫是昆虫群落的优势功能团；
The result indicates that the chewing pest, piercing-sucking pest, predatory natural enemy and neutral insect are the dominance guilds in the insect community.
近几年来植物—植食性昆虫—天敌间的三重营养级关系研究是一个热点。
Three nutrition relationships between plant and plant-eating insect and natural enemy are focused in some years.
植绥螨是许多害螨和小型有害昆虫的重要捕食性天敌，在农业生产中极具利用价值。
Phytoseiid mites is the important predatory natural enemy of many injurious mites and small injurious insects, which has the important utilization value in agricultural production.
天敌昆虫群落呈现出时序变化的特征。
The abundant community of insect enemies and temporal suppression mechanism against D.
昆虫界中多见一种保护性模拟成另一种没有保护的物种，因其模拟一种难吃又具伤害性的物种，可以躲避天敌。
A form of protective mimicry in which an unprotected species, especially of an insect, closely resembles an unpalatable or harmful species and therefore is similarly avoided by predators.
大多数螽蟖为植食性种类，是重要的农林害虫，部分类群为捕食性种类，是重要的昆虫天敌和生物防治的潜在资源。
Most of them are phytophagous insects and important pests in agriculture and forest; others are predatory insects and are insect enemy and potential resources for biocontrol.
从地表节肢动物数量动态可知，中性昆虫对天敌前期的定殖可能有着重要作用。
According to the dynamics of number of predators on the earth's surface, it was indicated that the neutral insects may be play important role to the setting of predators in the former of cauliflower.
生物学家早就知道，是否缺少昆虫天敌是决定一个植物物种是否会变成入侵物种的一个重要因素，但是，现在我们发现，情况比这要复杂得多。
Biologists have long known that the lack of insect enemies is a key factor in determining if a plant species becomes invasive, but we are finding out that the situation is decidedly more complex.
天敌昆虫群落呈现出时序变化的特征。
施用新得力对稻田昆虫天敌群落的物种组成及其结构特征不会造成明显的影响。
The application of Sindax had no evidently negative effects on the community structure and diversity of insect enemies in the treated field.
结果证明中性昆虫数量减少害虫数量增加，中性昆虫与害虫呈显著的负相关、与天敌呈显著的正相关。
The results showed that pest increased as decrease of the neutral insectabundance, while predator abundance increased as increase of the insect abundance.
事实上，许多植物对其天敌相当敏感，所以能很清楚地辨识出是什么昆虫在啃食自己的叶子。
In fact, some plants are so tuned into their predators that they know exactly what kind of insect is munching on their leaves.
介绍了云南省烟草主要害虫天敌资源和天敌昆虫的自然控制作用。
The main natural enemies of the pests on tobacco of Yunnan and their role on natural control of the pests were reviewed.
概述了蝗虫天敌昆虫的国内外研究种类与内容。
The paper reviewed species and research progress of natural enemy insects of locust both at home and abroad.
比如说，某种植物被昆虫攻击时可能会释放出能引来该种昆虫天敌的气味。
For example, plants being attacked by an insect might release scents that attract the predators of that insect.
赤眼蜂属是生物防治中广泛用来防治鳞翅目害虫的一类重要天敌昆虫。
Egg parasitoids of the genus Trichogramma are widely used in biological control against Lepidopterous pests.
植物在遭受植食性昆虫攻击时，能通过释放挥发物调节植物、植食性昆虫及其天敌三者间的相互关系，并由此而防御植食性昆虫。
Plants could defense herbivores through releasing volatiles which can manipulate relationships among plants, herbivores and their natural enemies when they were attacked.
杂草地生境和稻田生境节肢动物群落的害虫、捕食性天敌、寄生性天敌和中性昆虫亚群落的相似程度为捕食性天敌＞害虫＞寄生性天敌＞中性昆虫。
The descending sort of groups of arthropod was predators, insect pests, parasitoids and neutral insects by the similarity degree of arthropod groups between weed habitat and paddy habitat.
杂草地生境节肢动物群落的害虫、中性昆虫、捕食性天敌和寄生性天敌亚群落对稻田生境相应亚群落的影响程度不同。
The effect of predator, parasitoid, insect pest and neutral insect groups in the arthropod community in the weed habitat on the corresponding groups in the paddy habitat were varied.
研究表明，糖苷生物碱具有保护植物防御微生物、昆虫等天敌侵袭的作用，是植物的天然防御物质。
Some investigation have indicated that glycoalkaloids must have been evolved in nature to protect plants against bacteria, fungi, insects, and animals.
我国森林昆虫的开发与利用主要集中在天敌昆虫、传粉昆虫、药用昆虫、食用昆虫、工业用昆虫和文化昆虫等六大类。
Forest insects are mainly divided into natural enemies, pollinating insects, medical insects, edible insects, industrial insects and cultural insects.
许多寄生性天敌昆虫的雌虫不仅寄生寄主，而且还能取食寄主。
Many species of insect parasitoids not only parasitize hosts but can also feed and kill them.
研究结果总结如下：1化学除草剂对稻田生境昆虫天敌群落的影响不同除草剂对稻田生境昆虫天敌群落的影响不同。
The major results were concluded as follows:1. Effects of herbicides on the community of insect enemies in rice fieldsButachlor and Sindax were applied in different rice fields.
研究结果总结如下：1化学除草剂对稻田生境昆虫天敌群落的影响不同除草剂对稻田生境昆虫天敌群落的影响不同。
The major results were concluded as follows:1. Effects of herbicides on the community of insect enemies in rice fieldsButachlor and Sindax were applied in different rice fields.
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