Natural phenomena like droughts, floods, and insects are the bane of every farmer.
诸如干旱，洪水，虫灾等自然灾害是每个农民的噩梦。Infestations can be spotty in a vineyard. Foliage should be examined on a weekly basis before and after bloom.
葡萄园可能发生虫灾，因此在开花前后，应该每周对叶面进行检查。If you do not protect the frog, insect plague occurs, the rapid propagation of rice planthopper, the crops will be no harvest.
如果你不保护青蛙，虫灾发生时，快速繁殖稻飞虱，农作物不会收获。The researchers investigated other possible causes of the tree deaths like insects, fires and air pollution.
研究者调查了导致树死亡的其他几种可能原因，像虫灾，火灾和空气污染。Forests in the West , the Southwest and Alaska already have increases in fires , insect outbreaks and dead trees .
美国西部、西南部以及阿拉斯加地区的森林的火灾、虫灾和树木死亡的现象已经不断恶化。The crops suffered from insect plague this year, it will definitely be a lean year.
今年庄稼遭了虫灾，肯定是个歉岁了。It makes them easier targets for borers , and shows if the insects are nearby.
这使得它们更容易成为钻木虫的目标，以此来判断虫灾是否临近。Before 1949, there were mainly drought , flood , and insect plague in Loudi region , Hunan province.
解放前，湖南省娄底地区的自然灾害主要有旱灾、水灾和虫灾，还有雹灾、地震、风灾、冰冻等。Flood, drought and insects calamity were called the severest natural calamity in ancient agriculture.
水灾、旱灾和虫灾并称为威胁古代农业的三大自然灾害。