取食不同蔬菜的菜粉蝶幼虫对抑食肼的敏感性测定

叶片残留法测定结果表明，取食芥蓝（ＢｒａｓｓｉｃａａｌｂｏｇｌｏｇｒａＢａｉｌｅｙ）白菜（ＢｃｏｍｐｅｓｔｒｉｓＬ．ｓｓｐ．ｃｈｉｎｅｎｓｉｓ（Ｌ．）Ｍａｒｋｉｎｏｖａｒ．ｃｏｍｍｕｎｉｓＴｓｅｎｅｔＬｅｅ），菜心（Ｂ．ｃａｍｐｅｓｔｒｉｓＬ．ｓｓｐ．ｃｈｉｎｅｎｓｉｓｕｔｉｌｉｓＴｓｅｎｅｔＬｅｅ），萝卜（ＲａｐｈａｎｕｓｓａｔｉｕｍｖＬ．）的３，５龄菜粉蝶幼虫均对抑食腊的敏感性差异较大，ＬＣ５

SUSCEPTIBILITY OF IMPORTED CABBAGE WORM FEEDING ON VARIOUS VEGETABLES TO RH-5849

The results obtained from leaf residue bioassays showed that the 3-instar and 5-instar larvae of the imported cabbage worm eating 4 kinds of vegetables,i.e.Chinese cale ( Brassica alboglabra Bailey),Pak-choi ( B. campestris L.),Flowering Chinese cabbage ( B. campestris L.) radish ( Raphanus sativus L.),had remarkably varied susceptibility to RH-5849, and the highest ratios of the LC 50 were 1.61 times for 3-instar larvae and 1.92 times 5-instar larvae. But after feeding on Flowering Chinese cabbage for a generation,the variation became less,and the highest ratios of the LC 50 were 1 22 times for 3-instar larvae and 1.15 times for 5-instar larvae respectively.