李振宇，包华理，陈焕瑜，张德雍，胡珍娣，林庆胜，尹飞，冯夏

（广东省农业科学院植物保护研究所广州510420）

       Diamondback moth, or DBM, became the major pest of brassica vegetable production in Guangdong in the late 1980’s and has continued to challenge growers, particularly during the spring and autumn.  Control has relied on insecticides and, as has happened in other parts of the world, resistance to these has evolved and subsequent field control failures have occurred. We review and summarize the history of DBM management in Guangdong. We show that the geographic distribution of the pest in China is well described by a simple climate niche model.  Our model predicts the seasonal phenology and some of the variation in abundance amongst years in Guangdong.  Discrepancies may reflect migration and insecticide use at a landscape level.  The scale of the pest problem experienced varies with management practices.  Local production breaks, and strict post harvest hygiene are associated with lower pest pressure on large scale production units.  As more and more insecticides become ineffective the need to implement an IRM(Insect Resistance Management) strategy, as well as basic IPM(Integrated Pest Management) practices, will become more pressing.  The potential use and development of a better forecasting system for DBM that will assist these developments is outlined.