Exotic insect pests can produce both short-and long-term effects on forest ecosystems.
外来害虫可以对森林生态系统产生短期和长期的影响。
Scientists have made genetic modifications to cotton to increase its resistance to insect pests.
科学家对棉花进行了基因改造，以增强其对害虫的抵抗力。
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.
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。
Blaustein: We would have a heck of a lot more insect pests around.
布劳斯汀：我们身边会多出许多许多害虫。
Conventional cotton production relies heavily on chemical pesticides to control caterpillars and other insect pests.
常规棉生产严重依赖化学杀虫剂来防治毛虫和其他虫害。
They are highly destructive insect pests.
他们是破坏性极大的有害昆虫。
The severe frost killed off most of the insect pests.
严霜杀死了大多数害虫。
It's a key time to protect the crops from insect pests.
这是预防农作物遭受虫害的重要时期。
Corn is attacked by a number of plant parasites and insect pests.
玉米受到一些植物寄生虫和虫害的侵害。
Natural enemy resources of insect pests of alfalfa are very abundant.
苜蓿天敌昆虫资源非常丰富。
The future of bio-control technology of crops diseases and insect pests was prospected.
展望了农作物病虫害生物防治技术的发展前景。
Use the trap insect pests prevention and control should be combined with chemical control.
利用诱捕器防治害虫应与化学防治相结合。
Then, when droughts or outbreaks of diseases and insect pests ravaged crops, famine resulted.
一旦干旱或病虫害暴发，饥荒就随之出现。
The peach leafhopper (Typhlocyba sudra) is one of the important insect pests of peach tree in Guiyang.
桃一点小叶蝉在贵阳是桃和碧桃的重要害虫之一。
The insufficient ventilation also causes poor plant growth and the insect pests of scale insects and spider mites.
通风条件不足，也能导致植物生长不良和发生较为严重的蚧虫类、红蜘蛛类等危害。
Bioactivities and functional modes of plant extracts against insect pests were systematically studied in this paper.
本文系统研究了植物提取物对主要蔬菜害虫的生物活性及作用方式。
The diseases and insect pests and weeds of cotton have seriously restricted to increase the yield and quality of cotton.
棉花病虫草害是制约棉花产量和质量提高的重要原因之一。
And the species of insect pests in the city together with the insects as the pests' natural enemies hare been checked up.
初步摸清了秦皇岛市区园林害虫种类及天敌昆虫资源情况。
The feasibility of using mini-dose pesticides to control insect pests in paddy field where crabs were cultured was studied.
探讨了在养蟹稻田减量使用农药防治病虫草害的可行性。
Cold storage treatments for fresh fruit and vegetables are approved around the world for a range of quarantine insect pests.
全世界批准对新鲜水果和蔬菜进行冷藏处理以对付一些检疫性害虫。
Breeding and growing insect-resistant cultivars are the most economic and effective approach to control cotton insect pests.
培育和种植抗虫棉是控制棉花害虫最为经济、有效益的途径。
The effects of applying cotton growth and development model to the integrated control of insect pests of cotton were studied.
研究了棉花生育状态模型在棉虫综合防治中的应用效果。
Activities of EnSpray, a petroleum spray oil, on some insect pests and joint actions of its mixtures were evaluated in the lab.
测定了绿颖(农用矿物喷淋油)对几种害虫的生物活性及其混配剂的联合作用。
Studies on the insecticidal activity of extract of Ricinus communis L. against insect pests were carried out in vegetable crops.
用蓖麻提取物对蔬菜重要害虫进行了杀虫活性研究。
Huge amounts of Labour power as well as material and financial resources shall be consumed in weeding and insect pests prevention.
消耗大量的人力、物力、财力用于除草和防治病虫害。
The results showed that: (1) There were 59 species of insect pests (24 species) and natural enemies (35 species) in this corn field.
结果表明：（1）在棉区夏玉米田共有害虫和天敌59种，其中害虫24种，天敌35种。
The economic thresholds of insect pests are the most important distinguish basis in the scientific management system of forest pests.
在森林害虫科学管理决策专家系统中，害虫危害的经济阈值是最重要的判别依据。
This paper attempts to draw a general relationship between crop yield loss and chewing injury of reproductive organs by insect pests.
本文试从分散的材料中概括出主要大田作物繁殖器官被害与产量损失之间的一般关系。
They are highly destructive insect pests that can cause extensive damage to fruit and vegetable crops, trees, shrubs and turf grasses.
它们是具高度破坏力的害虫，会对蔬果作物，树木，灌木以及草坪造成重大损害。
Therefore people have to study the pest resistance, and insect pests resistance to insecticides is the most active study in this area.
为此，人们不得不进行有害生物抗药性的研究，而害虫抗药性的研究则一直是有害生物抗药性研究中最活跃的领域。
应用推荐