Economic threshold for this pest insect was estimated by measuring the increasement rate of population density.
并提出用害虫种群潜在密度确定卷叶螟经济阈值的方法。
Using system science methods to study the system control of pest insect population, has an obvious social significance and practical value.
以系统科学方法研究害虫种群系统的控制，具有明显的社会意义和实践意义。
These growing wild species express the characteristics of stress tolerance, resistance to disease and pest insect, high quality under the severe competition and selection of nature.
这些野生种在自然界的严酷竞争和自然选择条件下形成了许多优良特征特性，特别表现在抗逆性、抗病虫害、品质等方面。
The cane toad was introduced back in 1935 to control an insect pest that was destroying Australia's sugarcane plantations.
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 scale insect Paracerostegia kunmingensis Tang et Xie is an important pest that harms the deconative plants Pittosporum tobira.
昆明虎耳草的介壳虫是一种害虫，危害了拟南芥海桐花。
Insect predators living in the mixed species plantations reduce pest damage.
并且生活在混合植被中的昆虫捕食者可以减轻害虫的危害。
Asiatic insect introduced accidentally into United States; pest on citrus and apple trees.
偶然引入美国的亚洲昆虫；对柑橘树和苹果树有害。
The result indicates that the chewing pest, piercing-sucking pest, predatory natural enemy and neutral insect are the dominance guilds in the insect community.
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 system includes following subsystems as disease position diagnosis & harmless control, disease period diagnosis & harmless control, insect pest diagnosis & harmless control and so on.
系统主要包括病害部位诊断与无公害防治、病害时期诊断无公害防治、虫害诊断与无公害防治等子系统。
As long as the plantation simulate for forest structure and take use of the component of anti - insect in its habitat, we can solve the problem for pest disaster.
在人工林构建中，只有模拟天然林结构，从害虫原栖息地抗虫林分结构出发，才能从根本上解决猖獗成灾问题。
The mosquito is the most dangerous insect pest in the world, and man's oldest and deadliest killers.
蚊子是世界上最危险的害虫，也是人类最古老的宿敌和最致命的杀手。
If you discover an outbreak of some insect pest, there is seldom reason for panic. Your job is simply to keep insects under control. You will never eliminate them completely.
如果你在植株上发现了某种虫子，千万不要恐慌，只要把虫害控制住就好了，想完全祛除虫子几乎是不可能的。
Insect pest is one of the most important factors affecting high performance, good quality and safe production of vegetables.
害虫为害是影响蔬菜高效、优质、安全生产的重要问题。
The economic analysis of decision making is an important part of the modern insect pest management in theory and practice.
害虫管理决策的经济分析是现代害虫管理理论和实践的重要组成部分。
An insect pest fatal to cotton had struck the crop.
棉花遭受了一种致命的虫害。
The paper discussed Present situation and characteristics of insect pest in highway virescence, and put forward a prevention measurement.
本文对公路绿化虫害防治现状、发生特点及防治基本策略进行了初步的探讨。
The concentrations of Cd and Cu are different in the different parts of the male and female insect pest .
结果显示，镉与铜在不同性别东亚飞蝗不同部位的富集状况不同。
Service fee: According to actual seriousness of insect pest, surrounding environment, industry, building structure and etc.
服务的价格：视实际虫害严重程度，内外环境，行业，房屋结构等而定。
The efficiency measures should be provided for carrying out integrated pest control in Moso forest by insect dynamics analysis.
通过害虫种群变动分析，可以为开展竹林病虫害综合防治提供有效的应对措施。
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。
The prevalence of disease and insect pest is one of the factors, which restrict the yield in rape production.
在油菜生产中，病虫害的发生是油菜高产稳产的限制因子之一。
This is harmless to cultivation controls insect pest and disease to be most direct, the most effective method.
这是无公害生产中控制病虫害最直接、最有效的方法。
Forest insect pest and disease is one of the main factors influencing forest health.
森林病虫害是影响森林健康的主要因素之一。
The system will greatly improve the prevention of cotton diseases and insect pest.
此系统的建立将对我国棉花病虫害防治具有现实性的意义。
Thus, CMS lines are needed to improve insect pest resistance in hybrid rice.
因此，杂交稻抗虫性的提高有赖于不育系的改良。
Thus, CMS lines are needed to improve insect pest resistance in hybrid rice.
因此，杂交稻抗虫性的提高有赖于不育系的改良。
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