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。
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