They have to protect them from disease and insect pests.

他们必须保护这些作物不受疾病和害虫的威胁。

They use other chemicals to kill the insect pests that attack the plants.

他们还会用其他化学物质杀死攻击作物的害虫。

A hotter world is likely to bring an array of insect pests and pathogens to attack potatoes, soya beans, wheat, and other crops.

一个更热的世界可能会带来一系列的虫害和病原体，攻击土豆、大豆、小麦和其他作物。

DNA analysis showed that all six species of bat had fed on economically important insect pests.

DNA 分析表明，所有六种蝙蝠都以具有重要经济意义的害虫为食。

72. Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.

72。黄菊花通常令人生厌，它挤走不那么顽强的植物，并找来很多害虫。

The researchers suggest that the bats favour these fields because lack of water and nutrient run-off make these crops more susceptible to insect pest infestations.

研究人员表示，蝙蝠喜欢这些田地，因为缺水和养分流失使这些作物更容易受到害虫侵扰。

Well, obviously they want to protect Australia from diseases that might come in with imported goods, but they also want to prevent insect pests from being introduced into the country, and that's where I have a part to play.

显然，他们要保护澳洲不受进口食物所带来的疾病侵扰，但是他们也要防止害虫被引入国内，而这就是我的工作。

The project has been organised by the Forest Health Initiative (FHI), a quango set up to look into the idea of using genetic engineering to rescue species of tree whose populations have been devastated by fungal diseases or insect pests.

该项目由一个半官方机构—森林健康组织（FHI）发起，该机构的创立是为了观察用基因工程来拯救被真菌病或害虫摧毁的树木种群的可行性。

And a key reason for this destruction is that insect pests are destroying vast quantities of what is grown by local subsistence farmers, leading them to clear forest to create new paddy fields.

这种破坏的一个关键原因是害虫正在破坏当地自给自足的农民种植的大量作物，导致他们砍伐森林以开辟新的稻田。

" The fruit fly . . . is an insect pest of the first importance in horticultural development. Practically every fruit crop of value to man is subject to its attack. No effort . . . is too great to combat it" .

“果蝇… … 是园艺发展中最重要的害虫。几乎每一种对人类有价值的水果作物都会受到其攻击。任何努力… … 都无法战胜它”。