寄生蜂是调节寄主害虫种群数量的一个重要因子。
Parasitoids is an important factor in regulating insect population dunamics.
油菜品种和栽培方式间害虫种群数量存在显著差异。
Significant difference can be found in pest's population quantity among different rape varieties and cultivate patterns.
而增加对害虫天敌的种类或数量，来打破自然界的相对平衡，使之不利于害虫种群的增长，从而减少和防止它们的为害。
We can break the balance of nature by increasing the category and quantity of pests' natural enemy so as to limit their growth and thus prevent the harm.
研究温度与稻纵卷叶螟种群数量变动的关系，可为害虫种群的控制提供科学依据。
It was helpful for controlling the pest population to understand the relationship between temperature and rice leaf roller population.
研究温度与稻纵卷叶螟种群数量变动的关系，可为害虫种群的控制提供科学依据。
It was helpful for controlling the pest population to understand the relationship between temperature and rice leaf roller population.
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