作　　者： ; ; ; ; ; ; ; (韩长安）; (戚大国）;

机构地区： 上海市农业科学院

出　　处： 《上海农业学报》 1994年第1期52-56,共5页

摘　　要： １０５个苏芸金杆菌（Ｂａｃｉｌｌｕｓｔｈｕｒｉｎｇｉｅｎｓｉｓ）菌株初筛结果表明，其中１７个菌株对稻纵卷叶螟毒力较高，血清型分布主要为Ｈ１、Ｈ３、Ｈ５和Ｈ７。经３年（１９９０～１９９２）生物测定和田间试验复筛，确定菌株Ｓ－５４３（Ｈ５）的毒力最高，对稻纵卷叶螟１龄和２龄幼虫的Ｌｃ５０值分别为２．７μｌ／ｍｌ和６．８μｌ／ｍｌ，相应比目前生产菌株ＨＤ－１的毒力高０．７８倍和０．９８倍，但对棉铃虫的毒力却显著低于ＨＤ－１。 A program of screening high toxic strain of Bacillus thuringiensis against larvae of rice leaf roller Cnaphalocrocis midinalis Guenee was conducted during 3 years (1990～1992) in Shanghai. 17 strains showed higher pathogenicity and were mainly distributed toserotypes H1, H3, H5 and H7 in a total of 105 strains tested.Further bioassay and field testindicated that S-543(H5) had the highest toxicity in 17 strains preliminarily selected, and theLc50 of which were 2.7 and 6. 8μl/ml respectively to the 1st and 2nd instar larvae of rice leafroller,and the corresponding toxicity ratios were almost 1. 78 and 1. 98 times as much asthose of HD-1 strain (H3a3b) extensively employed in current commercial production, To thecontrary,this strain exhibited lower toxicity to cotton ballworm (Heliothis armigeraHubner) than HD-1 in bioassay test.

关 键 词： 苏芸金杆菌 稻纵卷叶螟 毒力 育种

领　　域： [农业科学] [农业科学]