他没有喷农药来防治害虫或疾病。
蜘蛛用多长时间消灭害虫？
栗子中害虫的命运在到达目的地之前是未知的。
The destiny of the pest in the chestnut is not known before reaching the destination.
这些老鼠是害虫。
我们叫它们害虫。
这里没有害虫。
它们是害虫。
这是只害虫。
外来害虫可以对森林生态系统产生短期和长期的影响。
Exotic insect pests can produce both short-and long-term effects on forest ecosystems.
科学家对棉花进行了基因改造，以增强其对害虫的抵抗力。
Scientists have made genetic modifications to cotton to increase its resistance to insect pests.
天气不可预测，土壤质量发生变化，害虫和疾病随时都可能出现。
There's unpredictable weather, changes in soil quality, and the ever-present possibility that pests and diseases may pay a visit.
不会发生干旱、洪水或害虫导致与天气相关的农作物歉收的现象。
There would be no weather-related crop failures due to droughts, floods or pests.
海水也杀死了贪婪的巨头苹果蜗牛，这种外来害虫以水稻幼苗为食。
This sea-water also kills off the greedy giant apple snail, an introduced pest that feeds on young rice plants.
蔗蜍本身变成了一种害虫，并且已经破坏了那片大陆上的很多野生动物。
The cane toad itself became a pest and has destroyed much of the wildlife on that continent.
园丁们从天面种植中获得的另一个好处是，他们面临的害虫问题减少了。
Another benefit gardeners get from planting well above the ground is that they face fewer pests.
它对腐烂和害虫的抵抗力是无与伦比的，它的油甚至可以保护指甲不受腐蚀。
It is unmatched in its resistance to rot and pests, and its oils even protect nails against corrosion.
蔗蜍早在1935年就被引进，以控制一种破坏澳大利亚甘蔗种植园的害虫。
The cane toad was introduced back in 1935 to control an insect pest that was destroying Australia's sugarcane plantations.
加拿大帝国商业银行还作为世界范围内防治害虫的生物制剂进出口的交换所。
CIBC also serves as a clearing-house for the export and import of biological agents for pest control world-wide.
短期影响包括与害虫活动直接相关的干扰，可能导致树木落叶、失去活力或死亡。
Short-term effects include the disturbances directly associated with the action of the pest, which may cause the defoliation, loss of vigor, or death of trees.
与此同时，海水也杀死了贪婪的巨型苹果蜗牛，一种以水稻幼苗为食的外来害虫。
At the same time, this sea-water also kills off the greedy giant apple snail, an introduced pest that feeds on young rice plants.
相反，一个复杂的顶极群落，如温带森林，将承受天气和害虫所带来的大规模破坏。
In contrast, a complex climax community, such as a temperate forest, will tolerate considerable damage from weather to pests.
传播疾病的害虫也不甘落后，其中约有100种对目前使用的各种杀虫剂有了免疫力。
Not to be left behind are the disease-spreading pests, about 100 species of which have become immune to a variety of insecticides now in use.
害虫通常以特定的树种为目标，一旦形成，它们通常会成为生态系统的永久组成部分。
Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
举个极端的例子，以单一作物为主的农田是如此不稳定，一年的坏天气或单一害虫的入侵可以摧毁整个作物。
To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop.
根据农民的报告，试验转基因种子的人与没有试验的人相比，每英亩用于控制害虫的杀虫剂用量只是稍微少一点。
According to farmers' report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.
奥格贝说，专家们正在研究如何控制这种害虫的危害，并防止其蔓延，直到现在，这种情况基本上还没有得到控制。
Ogbeh says experts are investigating how to control the pest's damage and prevent its spread, which has gone largely unchecked until now.
为控制害虫，人们持续且不计后果地使用人工合成化学品，对农作物和人类健康造成危害，事实证明会产生相反的效果。
The continuous and reckless use of synthetic chemicals for the control of pests which pose a threat to agricultural crops and human health is proving to be counter-productive.
20世纪60年代末期，当斯里兰卡繁荣的椰子果园被潜叶昆虫侵扰时，一种从新加坡引进的寄生幼虫将这种害虫控制住了。
In the late 1960s, when Sri Lanka's flourishing coconut groves were plagued by leaf-mining hispides, a larval parasite imported from Singapore brought the pest under control.
虽然 Fly-Away收取的价格低了不少，但我们省钱的最好方法还是回到 Buzzoff，进行所有的害虫防治服务。
Even though the price charged by Fly-Away is considerably lower, our best means of saving money is to return to Buzzoff for all our pest control services.
每年有10%的作物受损于一种叫做玉米根虫的害虫。
Each year ten percent of the crop is lost to a pest called corn rootworm.
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