Issue:ISSN 2095-1353
CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Tel:+86-10-64807137
Fax:+86-10-64807137
Email:entom@ioz.ac.cn
Your Position ：
Home->Past Journals Catalog->
2013年50 No.3
The occurrence characteristics and population dynamics of Cnaphalocrocis medianalis in Yunnan Province
Author of the article:
Author's Workplace：
Key Words：Cnaphalocrocis medianalis, occurrence, population dynamics, Yunnan Province
Abstract：
- The occurrence characteristics and population dynamics of Cnaphalocrocis medinalis Guenée were investigated in six major rice growing areas; west, southwest, south, southeast, east and northeast Yunnan in 2009-2012. The results show that C. medianalis was not detected in Yunnan in winter, which indicates that early immigrants of this pest originate mainly from overseas. Second, first detection dates of immigrants ranged from mid-April to mid-July; a span of nearly 3 months. Immigration to the west and southeast occurred from mid-April to late-May, but immigration to the southwest occurred from early-June to mid-July. Third, the west, southwest, northeast and south of Yunnan had relatively low abundances of this pest, which mainly occurred in middle-late rice fields. The leaf roll rate was less 30% and adult population density < 300 adults/667m2. The eastern and southeastern rice growing areas experienced moderate to serious damage with leaf-roll rates exceeding 80% and adult densities of up to 7000 adults/667m2. Fourth, the adult population peak occurred mainly from late-May to late-September. In the southeast, which suffers serious damage, the peak of adult occurrence is from June to mid-July which when rice crops are most vulnerable to this pest. So, monitoring and prevention measures for the rice leaf roller are particularly essential in Yunnan’s southeast rice growing region.