较高的气温也会增加生害虫和寄生虫的危险，因为冬季虫子死的更少。
Higher temperatures may also increase the risk of pests and parasites, because fewer will die off during the winter.
他们推测入侵性强的物种拥有本土植物所不具备的化学武器，因此，本土的害虫、寄生虫和其它植物群对此化学武器都没有任何还击之力。
Their hypothesis was that highly invasive species would have chemical weapons not found in native plants and which pests parasites and other plants would therefore not have evolved any resistance to.
拟除虫菊酯杀虫剂主要用于防治棉田、菜地、果树和茶叶上的农业害虫以及卫生害虫，也用于渔业生产上杀灭寄生虫。
Pyrethroid pesticides are mainly used in killing pests in cotton, vegetable, fruit and tea trees, public health and also in killing parasites in fish.
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