虫灾

是指农业生产过程中由于遭受冰雹、干旱、虫灾等非人为的自然环境影响，造成的农业生产减产的情况，具有无法预见性及区域性的特征。

It refers to the non-artificial natural environment influence , such as hail drought , plague of insects . It has no regional characteristics .

除水旱灾害之外，清代后期对湖南危害较大的灾种主要为虫灾，风灾、雹灾、冰冻雪灾偶有发生。

Besides the disasters of flood and droughts , heavy disasters , such as , plague of insects , windstorm , hail , and icy snow calamity took place occasionally in the later stage of Qing dynasty in Hunan .

歉收一半儿由于干旱，一半儿由于虫灾。

The crop failure was due in part to drought and in part to insect pests .

利用比值植被指数（RVI）分析法，与实地虫灾调查相结合，找出了受虫灾影响后不同灾害程度的RVI临界值，判对率为73%。

The ratio vegetation index ( RVI ) method is combined with field survey of insect pest to determine critical values of RVI for different degrees of disaster and the judgement accuracy reaches 73 % .

因为天灾诸如冰雹、迟雨、暴雨、以及虫灾使得GORUGUTU的居民处于饥饿的境地。

The land is green but hailstorms , rains that came too late , then rains that fell too heavily , as well as infestations of insects , have left Goru Gutu starving .

实施工程治理控制红脂大小蠹虫灾&对红脂大小蠹暴发成因及治理对策的探讨

Carrying out project management and controlling plague of red turpentine beetle

城里那家豪华酒店闹虫灾了。

There was a bedbug infestation at this really nice hotel downtown ...

持续无天牛虫灾防护林的探讨

Discussion on the establishment of sustainable protection forests without the plague of Longicorn

今年庄稼遭了虫灾，肯定是个歉岁了。

The crops suffered from insect plague this year , it will definitely be a lean year .

各虫灾爆发的最高月份均不同，但都在夏、秋季。

The months the psets happened the most were different , but all in summer and autumn .

全球变暖侵蚀海岸线，使虫灾泛滥、水性传染病扩散，气候变化更加无常。

Global warming erodes coastlines , spreads pests and water-borne diseases and produces more erratic weather patterns .

建立持续无天牛虫灾生态经济型防护林探讨

A Study on the Establishment of Sustainable Shelter Forests of Economic Ecology Type without the Plague of Longicorn

应用投影寻踪自回归模型作第二代棉铃虫灾变性预测的研究

Catastrophe Prediction of the Second Generation of Helicoverpa Armigera H ü bner by Projection Pursuit Autoregression ( PPAR ) Model

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。

Forests in the West , the Southwest and Alaska already have increases in fires , insect outbreaks and dead trees .

虫灾的成因涉及天牛习性、环境条件和防治技术3个方面。

Causes for the plague of longicorn beetles include the special habits of longicorn beetles , environmental factors and control methods .

各种虫灾主要发生在夏、秋两季，但发生月份稍有不同。

The four kinds of pests mainly took place in summer and autumn , but the months were a little different .

古代湖南虫灾、风灾、雹灾、冰冻、地震、疫灾简论

Account of Pest Plague , Wind Disaster , Hail Disaster , Freezing , Earthquake , and Epidemic Disease in Ancient Hunan

华北地区灾害频繁，水灾、旱灾、虫灾、雹灾、瘟疫等极易发生。

Disasters in North China , such as floods , droughts , pests , hail , and pestilence , were prone to happen .

因此采取化学防治方法控制虫灾时，宜在低龄幼虫期进行。

As a result , it is suitable to use chemical methods to control insect pest in the period of lower instar larvae .

这可能增加作物多样性，而多样性又会让虫灾减到最低，改善对气候涨落的耐受力，而且有希望增加生产力。

This would increase crop diversity , which would in turn minimise pest epidemics , improve tolerance to climatic fluctuations , and hopefully increase productivity .

在阿根廷，由于干旱和虫灾，预计今年大豆收成将下降近两成，这加大了美国供应的压力。

In Argentina , the soyabean crop is forecast to fall almost 20 per cent this year owing to drought and pests , raising pressure on US supplies .

随着越来越常见的极端天气事件破坏农作物、农作物虫灾发生模式的变化以及盐渗透到遭遇洪水到沿海地区，预计将会出现越来越多的饥饿和营养不良。

Increasing hunger and malnutrition are expected as increasingly common extreme weather events destroy crops , patterns of crop pest infestation change , and salt infiltrates flooded coastal areas . [ 5 ]

玄学家则从天道自然的角度，认为昆虫万物都是自然自生自化的结果，主张人类活动应遵循自然法则，否则就有虫灾。

From the perspectives of " heaven nature ", metaphysicians thought insects and all things were all the results of self-run of the nature . They advocated human activities should follow natural laws , or pest disasters would happen .

清代后期湖南的虫灾、风灾、雹灾和冰冻雪灾北方草原雪灾是天灾，更是一种人祸。

Plague of Insects , Windstorm Disaster , Hail Damage and Icy Snow Calamity in Hunan in the Later Stage of Qing Dynasty The snow calamity is caused by both nature and humankind in the northern prairie of China .

应用投影寻踪自回归方法，对第二代棉铃虫灾变性发生进行预测，其预测结果与用灰色系统理论方法预测结果比较，提高了预测精度16.7%。

The Projection Pursuit Autoregression ( PPAR ) technology and grey system theory and method more compared by the analysing catastrophe prediction of the second generation of Helicoverpa armigera H ü bner . The result of PPAR prediction method is more satisfactory than that of grey system prediction method .