If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.

如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。

In developing countries many rural people and traditional forest dwellers have remarkable knowledge about managing insect populations to produce food.

在发展中国家，许多农村居民和传统森林居民在管理昆虫以生产粮食方面具有丰富的知识。

Leaving some fields fallow provided a natural check on insect populations.

让一些土地休耕是自然控制昆虫数量的办法。

Courses also cover human control of insect populations, including the use of pesticides.

课程包括人类对昆虫的数量，如使用杀虫剂。

Global warming will bring about changes to insect populations, flooding and soil erosion.

全球变暖会引起一系列的变化，例如虫害、洪水、土壤侵蚀等。

Scolytidae is one of the most important insect populations of the forestry and spreaded abroad by international trade.

小蠹是最重要的森林蛀干害虫之一，由于危害极其隐蔽，被认为是通过国际贸易传播最为普遍的一类昆虫。

In an EPA meeting on GM crops last fall, Vaituzis acknowledged the lack of long-term data on Bt crops and insect populations.

2000年秋天，在环保署的一个基因改造作物会议中，卫图吉斯承认他们缺乏Bt作物和昆虫族群的长期研究资料。

The strategy, however, may not be so good for the few males left in scale insect populations: They're becoming obsolete and may eventually go extinct.

然而，这种生殖策略对于介壳虫种群中所剩无几的雄性来说，可能不是一件好事：它们变得越来越没有用了，最终可能会灭绝。

If one has a garden, a sign that one is in balance will be that the garden is in balance, and the insect populations will be in balance in association.

如果你有一个菜园，你平衡的标志，就是菜园平衡而昆虫的数量也相对平衡。

Entomogenous fungi constitute the largest taxonomic group of insect pathogens. They can usually lead to suppression of injurious insect populations in nature without any help from man.

昆虫病原真菌在自然环境中对害虫数量起着抑制作用，在害虫的微生物防治中也占有独特的地位。

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.

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。

Ripper recognized that resurgence of insect Numbers was a common feature of post - spray populations.

黎普认为昆虫数量的恢复是喷药后种群的普遍现象。