作　　者： ; ; ; ; ;

机构地区： 华南农业大学

出　　处： 《植物保护学报》 2004年第4期 411-417,共7页

摘　　要： 进行了21种茼蒿素类似物对小菜蛾2龄幼虫的拒食活性筛选,对8号、12号和20号化合物进行了拒食活性测定,研究了20号化合物对菜粉蝶幼虫体壁及血细胞的影响,并进行了20号化合物对菜粉蝶幼虫的田间小区试验.21种茼蒿素类似物中,20号、16号、12号和8号等化合物的拒食活性较好.8号、12号和20号化合物对小菜蛾4龄幼虫处理后24h的非选择性AFC50分别为549.03、405.97和205.06μg/mL;选择性AFC50分别为432.57、114.34和72.32μg/mL.处理后24h,12号与20号化合物对菜粉蝶4龄幼虫的选择性AFC50分别为398.88和280.54μg/mL,20号化合物对菜粉蝶2龄幼虫非选择性AFC50为112.76μg/mL.20号化合物对菜粉蝶4龄幼虫血细胞数量、体壁及体壁中几丁质有明显的抑制作用.药后第3、5和7天,400μg/mL的20号化合物对菜粉蝶幼虫的防治效果分别为28.60%、54.93%和58.21%. Bio-activities of 21 kinds of compounds of spiro enol ether derivatives against the2nd instar larvae of Plutella xylostella were tested for antifeedant activity.Antifeedant activity ofcompound No.8,No.12 and No.20 against 4th larvae of P.xylostella,effects of compoundNo.20 on cuticle and blood cell of 4th instar larvae of Pieris rapae,and control effect of com-pound No.20 against larvae of P.rapae were studied.Antifeedant activity of compound No.8,No.12,No.16 and No.20 against larvae of P.xylosteUa were better than those of others.AFC_(50) of compound No.8,No.12 and No.20 in non-selective test against 4th instar larvae ofP.xylostella were 549.03μg/mL,405.97μg/mL and 205.06μg/mL after 24h treatment,andAFC_(50) in selective test were 432.57μg/mL,114.34μg/mL and 72.32μg/mL.AFC_(50) of com-pound No.12,No.20 in selective test against 4th instar larvae of P.rapae were 398.88μg/mLand 280.54μg/mL,respectively,and AFC_(50) of compound No.20 in non-selective test was112.76μg/mL after 24h treatment.Compound No.20 could reduce the content of cuticle andamount of blood cell of 4th instar larvae of P.rapae.Field trial showed that control efficacy ofcompound No.20 at concentration of 800μg/mL against larvae of P.rapae were 28.60%,54.93% and 58.21% 3d,5d and 7d after treatment.

关 键 词： 菜粉蝶 幼虫 茼蒿 拒食活性 小菜蛾 体壁 田间小区试验 化合物 类似物 选择性

领　　域： [农业科学] [农业科学] [农业科学] [农业科学]