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山楂叶螨抗药性及混配增效作用 总被引:4,自引:2,他引:4
采用载玻片浸渍法测定了山西省忻州、晋中、运城地区山楂叶螨种群对9种杀螨剂的抗药性水平.测定结果表明:忻州地区种群对甲氰菊酯和三氯杀螨醇表现中抗,抗性指数FR分别为17.79和31.93倍,对水胺硫磷和毒死蜱表现低抗,FR值分别为7.74和5.35倍;晋中地区种群对水胺硫磷、甲氰菊酯和三氯杀螨醇均表现中抗,FR值为22.42~33.00倍,而运城地区种群对这3种药剂产生了高抗,FR值分别为135.05、41.53和1714.01倍;运城地区种群对毒死蜱表现中抗,FR值为34.49倍;晋中和运城地区种群对双甲脒表现低抗,FR值分别为5.15和6.89倍;3个种群对阿维菌素、苯丁锡、三唑锡和四螨嗪仍相对敏感.混配增效作用测定结果表明,阿维菌素与甲氰菊酯1:20、1:10、1:5组合以及阿维菌素与三氯杀螨醇1:20、1:10组合均具有明显增效作用,共毒系数为189.63~363.30,其中阿维菌素与甲氰菊酯1:20和1:10组合以及阿维菌素与三氯杀螨醇1:20组合是比较理想的混配组合. 相似文献
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体育精神对创新人才和创业人才的培养有着重要影响 ,体育精神所体现的一种永不服输、永不满足、不断否定自己而追求更高更快更强的精神 ,正是创新型人才所必须具备的优秀品质 ,也是一个民族一个国家的发展兴盛所必需的。同时 ,体育精神体现出来的竞争意识、规则意识、协同意识 ,也是个人、民族和国家在自身的发展中以及在国际竞争中所必需的。提出体育教育对学生人格的塑造以及竞争意识、拼搏意识、规则意识、协同意识和品质意志力的培养有重要影响 ,且对学生创造性的培养有着重要意义。 相似文献
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麦茎蜂(CephuspygmaeusLinn.)是近年来在平遥县新发现的1种小麦害虫。1997年在卜宜乡落邑村首次发现,于1998年、1999年虫害发生面积逐渐扩大,目前分布在全县7个乡镇,发生面积约667hm2,虫株率一般为10%~20%,发生严重地块高达40%,减产率5%~10%,主要以旱地和一水地小麦发生为重。麦茎蜂在平遥县1a发生1代,以老熟幼虫在小麦残茬的最下部越冬,开春后幼虫化蛹,在5月上中旬羽化。卵单产于较老的顶部节间麦茎内(小麦主茎落卵量高于分孽,大部分产卵于穗茎节基部1/5至1… 相似文献
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斜纹夜蛾感受器超微形态特征 总被引:2,自引:0,他引:2
采用扫描电镜技术,系统研究了斜纹夜蛾触角、跗节和产卵器的感受器形态结构特征,发现触角感受器主要包括毛形、锥形、刺形、耳形和腔锥感受器.雌、雄虫触角锥形感受器形态特征区别明显,雄蛾锥形感受器长约10~15 μm,基部直径约4~5μm,显著比雌虫锥形感受器长、粗,雄蛾锥形感受器顶端有一小锥,雌蛾没有.雌成虫和雄成虫前足、中足、后足跗节均分布有毛形和刺形感受器,但数量明显少于触角同类感受器数量.雌成虫产卵器上主要为长毛形和短毛形感受器,这些感受器可能与其感受环境信息、产卵场所选择等行为有关.Abstract: The ultrastructures of the sensilla on the antennae, the tarsi and the ovipositor of Spodoptera litura were observed with scanning electron-microscopy. The antennae of both male and female moths were found to contain five kinds of antennal sensilla, namely, sensillum trichodeum, sensillum basiconicum,sensillum chaeticum, ear-shaped sensillum and sensillum coeloconicum. The characters of sensillums basiconicum on the antennae were different between the male and the female. The length was 10-15 μm, the diameter at the base was approximately 4-5 μm for the male antennae, which were significantly longer and bigger than the female antennae, and the male moths had onesmall bradawl at the bass of the antennae while the female moths did not. The tarsi of both male and female moths contained two kinds of sensilla:sensillum trichodeum and sensillum chaeticum; however, their numbers were significant less than those on the antennae. The long sensillun trichodeum and short sensillun trichodeum were mainly distributed on the ovipositor. These results provided basis for exploring the molecular mechanism of oviposition deterrent. 相似文献
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