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。

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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。

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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。

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We're spraying the alfalfa for a insect pest called a alfalfa weevil.

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For example, widespread failure in our handful of remaining major crops and animal breeds due to disease or pest outbreaks is a very real possibility: given that pest and pathogens are constantly evolving, a diverse gene pool is essential if we are to develop insect- and disease-resistant strains in the future.

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