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三种增效剂对棉铃虫增效作用 总被引：5，自引：0，他引：5
用３个不同地区的棉铃虫田间种群分别测定了３种增效剂对３种杀虫剂的增效作用。结果表明ＰＢ对氯氟氰菊酯,ＤＥＦ对辛硫磷,ＰＢ和ＴＰＰ对灭多威增效较好,而且棉铃虫的抗性水平越高,增效剂的增效作用越突出。 相似文献
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棉铃虫对菊酯类杀虫剂的抗性机制 总被引：1，自引：0，他引：1
研究害虫对杀虫剂的抗药性机理在抗性害虫综合治理中具有重要意义。本文从昆虫的靶标敏感性降低与抗击倒基因、氧化代谢、酯酶水解代谢、表皮穿透作用降低、药剂间的交互抗性机制、混用增效作用，以及非杀虫剂诱导的抗性机理等方面阐述了近年来棉铃虫对菊酯类杀虫剂抗性机理的研究进展，并就混剂在抗性治理中的应用等问题进行了讨论。 相似文献
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三种杀虫剂对棉铃虫的毒力测定湖北农学院应用化学研究所姚安庆由于有机磷、菊酯类农药及其复配产品的大量使用。导致棉铃虫抗性的不断产生。为了更好地防治好高龄棉铃虫，减少对农业生态环境的污染，我们采。一用掉物性杀虫剂与市场上正在推广的杀虫药剂作比、较、用接近... 相似文献
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通过HBF-1菌株培养物各组分与HD-1菌株混合对棉铃虫的LC∞测定结果表明，HBF-1孢晶混合物对HD-1的纯晶体和孢晶混合物分别增效170．0％、80．0％，HBF-1活芽孢对HD-1的纯晶体和孢晶混合物分别增效240．0％、160．0％，HBF-1纯晶体和死芽孢均无增效作用。在一定范围内，随着HBF-1菌株活芽孢浓度的增高，其增效作用逐步提高，HBF-1活芽孢浓度为100μg／g时对棉铃虫的增效作用最大，使其死亡率提高了40．0％；HBF-1活芽孢浓度为50μg／g时对小菜蛾的增效作用最大，使其死亡率提高了47．0％。 相似文献
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增效剂的增效作用与棉铃虫抗药性水平之间的关系研究 总被引：2，自引：0，他引：2
以不同抗药性水平的棉铃虫三龄幼虫试虫，分别测定增效磷（ＳＶ１），八氯二丙醚（Ｓ２）月桂氮Ｚｕｏ酮（ＤＣ），ＩＳ－９６１对久效磷（ｍｏｎｏｃｒｏｔｏｐｈｏｓ）灭多威（ｍｅｔｈｏｍｙｌ），氰戊菊酯（ｆｅｎｖａｌｅｒａｔｅ）的增效作用，结果表明：４种增效剂的增效作用，除与被测定药剂种类有关外，还与棉铃虫抗药性水平密切相关，其增效作用一般随抗性水平的提高而增加，但增加的幅度低于抗药性提高的幅度。 相似文献
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F.M. Ashton O.T. de Villiers R.K. Glenn W.B. Duke 《Pesticide biochemistry and physiology》1977,7(2):122-141
Time- and concentration-course studies were conducted to determine the effect of thirteen herbicides on photosynthesis, respiration, RNA synthesis, protein synthesis, and lipid synthesis using isolated single leaf cells. Each herbicide was from a different chemical class. Appropriate 14C-substrates and product purification procedures were used for each process prior to liquid scintillation counting. The most sensitive metabolic site of inhibition was photosynthesis for atrazine, bromacil, dichlobenil, monuron, and paraquat; RNA synthesis for dalapon and dinoseb; protein synthesis for chlorpropham; and lipid synthesis for CDAA, chloramben, 2,4-D, EPTC, and trifluralin. However, with several herbicides, one or more process was almost as sensitive as the one mentioned above. All herbicides inhibited more than one process, and the most sensitive site of inhibition may not be the same process that was inhibited the greatest at the maximum concentration and maximum exposure time used. Therefore, a concept of metabolic sites of action, rather than a primary site of action, appears to be more meaningful for herbicides. 相似文献
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调查了甘肃省临洮县为害百合的地下害虫种类, 并以主要发生为害种类为供试对象, 采用拌土法测定了几种生物（源）农药对主要害虫的室内毒力和致死中时。调查发现小云斑鳃金龟Polyphylla gracilicornis、棕色鳃金龟Holotrichia titanis为主要发生及为害种类, 不同时间发生种类存在差异, 9月份以小云斑鳃金龟幼虫发生为害为主, 发生量占地下害虫总数的66.16%, 平均种群密度为10.48头/m2, 10月份, 则以棕色鳃金龟幼虫发生为主, 发生量占地下害虫总数的96.86%, 平均种群密度为7.79头/m2, 主要取食百合根系和鳞茎, 造成根系数量减少, 鳞茎出现不规则褐色缺口或凹陷斑。药剂筛选结果表明, 1.8%阿维菌素乳油、200亿孢子/g球孢白僵菌粉剂对两种蛴螬均具有较高的杀虫活性和速效性, 药后7 d时, 校正死亡率在82.22%以上, 对小云斑鳃金龟幼虫和棕色鳃金龟幼虫的LC50分别为0.161、0.060 mg/g和5.558×107、0.362×107孢子/g, LT50分别为2.237 d（2.2 mg/g）、1.393 d（2.2 mg/g）和6.645 d（40.0×107孢子/g）、4.940 d（2.0×107孢子/g）, 这两种生物（源）农药对两种蛴螬的LC50和LT50值均略大于两种化学农药25%二嗪磷乳油、40%辛硫磷乳油处理的, 且对小云斑鳃金龟幼虫的杀虫活性均低于对棕色鳃金龟幼虫的杀虫活性, 致死中时则长于对棕色鳃金龟幼虫的致死中时。 相似文献
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Effects of timing and method of application of Penicillium oxalicum on efficacy and duration of control of Fusarium wilt of tomato 总被引：3，自引：0，他引：3
The effects of timing and method of application of Penicillium oxalicum on the control of fusarium wilt of tomato were investigated. Application of P. oxalicum to tomato seedlings in seedbeds reduced disease caused by Fusarium oxysporum f.sp. lycopersici in a growth chamber by 45–49% and in glasshouse experiments by 22–69%. Disease suppression was maintained for 60–100 days after inoculation with the pathogen in the glasshouse. No disease reduction was observed in tomato plants where P. oxalicum was applied to seeds. Treatment with P. oxalicum did not affect the population of F. oxysporum f.sp. lycopersici in the rhizosphere. 相似文献
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福寿螺配偶个体大小选择性初步观察 总被引：7，自引：0，他引：7
通过野外观察与实验研究,掌握了福寿螺的婚配体制及其配偶选择性规律。福寿螺与多数低等动物一样,其婚配属于乱交制,无固定配偶;雌螺对与其交配的雄螺个体大小没有选择性,而雄螺对雌螺的个体大小有选择性,倾向于与较大个的雌螺交配。 相似文献
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E. LIMPERT B. C. CLIFFORD A. DREISEITL R. JOHNSON K. MÜLLER A. ROELFS C. WELLINGS 《EPPO Bulletin》1994,24(1):109-112
A variety of systems of designation has evolved to name pathotypes of plant pathogens. The systems were evaluated to determine those best suited for particular purposes. Virulence and avirulence/virulence formulae of pathotypes have advantage over the use of consecutive numbers or letters given in chronological order of pathotype discovery. As soon as pathotype information exceeds a certain level of complexity, mathematical codes are most advantageous, in particular two codes, octal notation and coded triplets. A more universal adoption of the most appropriate codes is recommended to ease communication and comparisons of results. 相似文献
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Christopher D. Keating Lindy M. Holden-Dye Robert J. Walker 《Pest management science》1996,46(3):263-266
The neuropeptide AF2 has a complex set of actions on the dorsal muscle strip of Ascaris suum, including a potentiation of the acetylcholine-stimulated muscle contraction. Caffeine at 100 μm and 5 mm inhibited this potentiation, as did 100 μm theophylline in two out of six studies. The cyclic-AMP-potentiating compounds IBMX, dibutyryl cAMP and forskolin had no effect on the AF2-induced potentiation of the acetylcholine-stimulated muscle contraction. These preliminary data suggest that the potentiating action of AF2 is not mediated by a cAMP pathway. 相似文献
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为了研究青稞种子外部和内部携带真菌情况,比较不同杀菌剂对青稞种子的带菌消毒效果和对幼苗生长的影响,为青稞种子播前包衣处理和种传真菌病害防控提供依据,采用离体平皿法对云南迪庆‘云青1号’、‘云青2号’和‘短白青稞’3个主栽品种进行带菌检测,并对种子进行拌种或浸种处理测定6种杀菌剂对种子消毒效果,分析杀菌剂对种子发芽和幼苗生长的影响。结果表明:供试青稞种子表面携带的优势菌群为青霉(Penicilliumspp.)、镰刀菌(Fusariumspp.);种子内部寄藏的真菌主要为镰刀菌、核腔菌(Pyrenophoraspp.)、附球菌(Epicoccumspp.)、丝核菌(Rhizoctoniaspp.)、链格孢(Alternariaspp.)和木霉(Trichoderma spp.)。青稞不同品种的种子表面及内部携带的真菌种类差异较大。致病性测定表明,镰刀菌对种子萌发和幼苗生长影响最大,后期出现幼苗坏死现象。45%咪鲜胺EW、75%百菌清WP、50%福美双WP对青稞种子携带真菌均有显著抑制作用和消毒效果,50%福美双WP消毒效果最优,达100%;45%咪鲜胺EW、75%百菌清WP、50%福美双WP处理对青稞种子发芽和幼苗生长均无显著影响。 相似文献
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