Analysis on the causes of outbreaks and control strategy of the rice planthoppers in huazhou in recent ten years
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Key Words：rice planthoppers， occurrence characteristics， outbreak causes， control strategy
Abstract： The rice planthopper is an important migratory pest that causes extensive and commercially significant damage to rice crops. In order to improve and enhance monitoring technology used to control this pest, we summarized and analyzed forecast data on rice planthopper outbreaks in previous years in Huazhou, Guangdong Province. The results show that some new trends have emerged over the last decade; rice plant hoppers appear significantly earlier than they previously did, the number of the secondary pests and repeat generations has increased, the frequency of outbreaks has increased, all of which cause greater damage to rice crops. These changes can be attributed to more favorable climatic conditions for planthopper growth, changes in horticultural practices, enhanced resistance to drugs and inappropriate control measures. To reduce the damage caused by this pest it is necessary to adjust control strategies, strengthen forecasting and prevention abilities and improve pesticide selection and application methods.