In the northern states fumigation is needed only after insect outbreaks occur.
在北部各州，只在虫害发生后才进行熏蒸。
It even allows it to forecast outbreaks of insect-borne diseases such as malaria.
该系统甚至还被用于预测疟疾等病虫害的爆发。
Then, when droughts or outbreaks of diseases and insect pests ravaged crops, famine resulted.
一旦干旱或病虫害暴发，饥荒就随之出现。
Then, when droughts or outbreaks of diseases and insect pests ravaged crops, famine resulted.
一旦干旱或病虫害暴发，饥荒就随之出现。
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