Issue:ISSN 2095-1353
CN 11-6020/Q
Director:Chinese Academy of Sciences
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2013年50 No.3
Climatic factors influencing the 2003 outbreak of Cnaphalocrocis medinalisin in China
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Key Words：Cnaphalocrocis medinalis, migration, outbreak population, climate condition
Abstract：An outbreak of the rice leaf roller Cnaphalocrocis medinalis Guenée in China in 2003 caused severe damage to rice production. The population dynamics of the rice leaf roller in relation to climatic factors in 2003 were analyzed to investigate its outbreak mechanism. The results show that unusual climatic factors in 2003 played an important role in potentiating this outbreak. There were three unusual climatic factors in 2003. First, temperature was extremely high in northern Vietnam and the southern part of south China, resulting in the earliest recorded emergence of adults and a much larger initial population number. Secondly, the enhancement and westward extension of the western Pacific subtropical high in July resulted in unusually high temperatures and drought in southern China which stimulated a massive migration from early- and middle-rice crops in Jiangxi and Hunan provinces to single-rice crops in the middle and lower reaches of the Yangtse River. Thirdly, in late August and early September, the southward retreat of the western Pacific subtropical high occurred distinctly later than usual, causing a warm autumn and late conversion of the monsoon. Consequently, rice leaf rollers in the Jiangnan-Huainan area failed to migrate southward and remained for one more generation.