Some plants would control pests and soil quality naturally, and humans helped by rotating their crops; if extra fertilizer was needed, manure usually filled in.
一些作物本身就具备防治病虫害、保持土壤肥力的功效，人类辅以轮种；即便需要添加一些肥料，大多用的是人畜粪便。
Entomopathgenic fungi are one of vital microorganisms to control pests and have potentials in biological control.
昆虫病原真菌是一类重要的杀虫微生物，在害虫生物防治中具有广阔的应用前景。
Chemical control - using chemical pesticides to control pests.
化学防治——利用化学杀虫剂来防治害虫。
Amphibians play an important role in maintenance of ecological balance, control pests and so on, and they have important economic and medicinal value.
两栖类动物不仅在维持生态平衡、控制害虫等方面有重要作用，而且有重要的经济和药用等价值。
ObjectiveTo develop high efficient water based insecticide to control pests.
目的为防治广谱抗性害虫，研制行之有效的水基杀虫剂。
Results The cypermethrin preparation could control pests for 2 months, but the effective duration of cypermethrin confected by chitosan was more than 3 months.
结果单纯氯氰菊酯制剂的持效时间为2个月左右，壳聚糖复配的氯氰菊酯制剂的持效时间至少为3个月。
Results The cypermethrin preparation could control pests for 2 months, but the effective duration of cypermethrin confected by chitosan was more than 3 months.
结果单纯氯氰菊酯制剂的持效时间为2个月左右，壳聚糖复配的氯氰菊酯制剂的持效时间至少为3个月。
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