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本文根据在深圳、广州、东莞三地对不同蔬菜、不同农事措施、杀虫剂不同施用水平菜地小菜蛾自然种群幼虫被寄生率调查结果,分析十字花科蔬菜-小菜蛾-菜蛾绒茧蜂三种群系统中,蔬菜品种、农事操作、杀虫剂对菜蛾绒茧蜂寄生行为的影响。结果说明:不同蔬菜品种上,小菜蛾幼虫被寄生率有不同程度的差异,以包心菜菜地寄生率最高,超过30%。十字花科蔬菜与其他非十字花科蔬菜的间作对绒茧蜂的寄生率也存在一定的影响作用。深圳、东莞、广州三个地区,以广州地区小菜蛾幼虫被寄生率较高。化学杀虫剂降低绒茧蜂的寄生率。小菜蛾幼虫的体色与被寄生率也有一定的关系,以体色与背景色一致的个体被寄生率较低 相似文献
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紫背金盘提取物对小菜蛾的作用研究 总被引:6,自引:1,他引:6
紫背金盘提取物对小菜蛾幼虫有拒食和生长发育抑制活性,以氯仿提取物活性为最高。饲喂处理幼虫出现脱肛,黑斑和畸形等缓慢症状,成虫的生殖过程受到影响,这种作用有利于压低田间种群数量。对多种杀虫剂产生抗性的小菜蛾品系对紫背金盘提取物没有抗性,因此,这种植物提取物可作为小菜蛾抗性治理的一条途径。 相似文献
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Shoji Sonoda Xueyan ShiDunlun Song Youjun ZhangJianhong Li Gang WuYong Liu Ming LiPei Liang David WariMasaya Matsumura Chieka MinakuchiToshiharu Tanaka Tadashi MiyataXiwu Gao 《Pesticide biochemistry and physiology》2012,102(2):142-145
In addition to the allele frequencies of the L1014F and T929I mutations which are involved in nerve-insensitive resistance to a pyrethroid, those of the M918I mutation were examined using field strains obtained in China, Thailand, and Japan during 2009-2011. Results show that the resistance allele frequencies at the L1014F site were 89-100%, 97-100% and 65-85%, respectively, for strains in China, Thailand, and Japan. The respective allele frequencies at the T929I site were 86-100%, 70-97% and 58-84% for Chinese, Thai, and Japanese strains. With low frequencies up to 27%, M918I was found in Japan and China, but not in Thailand. The strain homozygous for the M918I and L1014F mutations was established and its resistance level to a pyrethroid was examined. The strain lacks a portion of the sodium channel gene corresponding to the 3′ portion of exon 18a, intron 18, and the 5′ portion of exon 18b. Nevertheless, the strain showed a similar level of resistance to that which was homozygous for the T929I and L1014F mutations. 相似文献
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为研究5%氯虫苯甲酰胺悬浮剂(SC)对小菜蛾的防治效果,利用4种药剂进行了室内毒力测定和田间药效试验。室内毒力测定结果表明:药后48 h 5%氯虫苯甲酰胺SC对小菜蛾的毒力最高,LC50为0.563 0 mg·L-1|其次是10%多杀霉素水分散粒剂(WG),LC50为0.856 7 mg·L-1|1.9%甲氨基阿维菌素苯甲酸盐乳油(EC)和1%阿维菌素EC的毒力较低。田间药效试验结果表明:5%氯虫苯甲酰胺SC 1 000倍液对小菜蛾的防效最好,达到95.04%,显著优于其他3种药剂|10%多杀霉素WG 5 000倍液的防效次之,为82.01%|而1.9%甲氨基阿维菌素苯甲酸盐EC 1 500倍液和1%阿维菌素EC 750倍液的防效较低,分别为71.67%和63.95%。 相似文献
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小菜蛾(Plutella xylostella L.)是世界范围内十字花科植物的头号害虫,试验在26℃、光照明暗比为16L∶8D、湿度为70%的条件下,以甘蓝(Brassica oleracea L.)(‘秦甘70’‘秦甘80’‘绿球66’)、小青菜(Brassica chinensis L.)(‘上海四月慢’)、花椰菜(Brassica oleracea L.var.botrytis)(‘荷兰83号’)和油菜(Brassica napus L.)(‘青杂7号’)6个不同品种4类十字花科蔬菜为食料,观察小菜蛾一个完整世代的不同生命参数,并分析取食不同十字花科寄主的小菜蛾生长发育状况及繁殖差异。结果表明:在6个不同品种4类十字花科中,取食‘荷兰83号’花椰菜的小菜蛾试验组幼虫历期、蛹历期、蛹质量、卵历期及全世代历期最短,其全世代存活率最高;取食‘上海4月慢’小青菜的小菜蛾试验组幼虫存活率、化蛹率、蛹羽化率、卵孵化率及全世代存活率最低,其成虫历期、卵历期及全世代历期为最长。在4类十字花科寄主中,小菜蛾的最适寄主植物为‘荷兰83号’花椰菜,最不适宜小菜蛾生长发育及繁殖的为‘上海四月慢’小青菜。 相似文献