Current situation and cause analysis of grassland pests on grassland in China

The pest insects seriously occur in natural grassland, which caused serious damage to the animal husbandry in China. During the past ten years from 2003 to 2012, the damage grassland of annual averaged 20.99 million hectares and the pasture lost annual averaged 9.45 billion kg by the pest insects. The pest insects damage in natural grassland reduced gradually by disaster prevention and control measures organized by the ministry of agriculture of China. Compared with 2003, the damaged area of pest insects decreased by 34.7% in 2012. Grasshoppers’ damage significantly decreased and the other pest insect’ damage decreased except with that grassland caterpillars’ damage decreased since 2008 although its damage increased from 2003. The main reasons which lead to the heave pest damage included less annual prevention area, weakly monitor and warming and less support in science and technology. Some suggestions on how to effectively control the pest insects were also put forward in this paper.