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本试验采用Potter喷雾法测定了农抗新I、三氟氯氰菊酯、有机氮及有机磷杀(虫)螨剂等6种药剂对朱砂叶螨的毒力。结果LC50(有效成分ppm)次序为40%氧乐果(11.66)>2.5%三氟氯氰菊酯乳油(22.34)>20%甲炙酯(59.95)>农抗新I(浓缩液,83.4r/ml)>20%双甲脒(126.83)>20.42%三氯杀螨醇乳油(166.54)。 相似文献
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为了进一步研究新化合物HNPC-A14344/14343的杀螨生物活性,采用Potter喷雾法研究了HNPC-A14344/14343对朱砂叶螨螨卵的活性。结果表明:HNPC-A14344对朱砂叶螨螨卵具有优异活性,LC_(50)值为5.78 mg·L~(-1),其对螨卵的活性优于对照药剂螺虫乙酯LC_(50)8.65 mg·L~(-1),稍优于螺螨酯LC_(50)6.05 mg·L~(-1),且HNPC-A14344对螨卵的活性明显优于HNPC-A14343,HNPC-A14344具有进一步研究与开发价值。 相似文献
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[目的]为获取新的高效复配杀螨剂配方。[方法]以共毒因子法和共毒系数法评价丁醚脲与溴虫腈对朱砂叶螨的联合杀螨活性及筛选最佳配比。[结果]丁醚脲与溴虫腈对朱砂叶螨雌成螨处理后24 h的LC50值分别为154.67、8.80 mg/L,丁醚脲与溴虫腈以质量比为94.5:5.5~92.0:8.0混合具有明显增效作用,最佳配比为94.0:6.0或93.5:6.5,对朱砂叶螨处理后24 h的共毒系数分别为183.65和187.26,LC50值分别为39.79、40.27 mg/L,其毒力分别是丁醚脲毒力的3.66、3.89倍。[结论]丁醚脲与溴虫腈以94.0:6.0或93.5:6.5混合对朱砂叶螨具有显著的增效作用。该结果可为丁醚脲与溴虫腈的混合使用防治害螨及复配剂开发应用提供科学理论依据。 相似文献
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苹果树山楂叶螨对七种杀螨剂的抗性研究 总被引:1,自引:0,他引:1
采用FAO推荐的玻片浸渍法测定山楂叶螨叶螨对氧乐果等七种药剂的抗性水平。结果表明,平凉地区山楂叶螨对氧乐果和水胺硫磷已产生了中等抗性,抗性倍数分别为26.22和23.29;对甲氰菊酯和克螨特产生了低等抗生,对三氯杀螨醇、哒螨灵、氟氯菊酯仍处于敏感水平。 相似文献
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Ellis Hoffland Marcel Dicke Willeke Van Tintelen Herman Dijkman Marinus L. Van Beusichem 《Journal of chemical ecology》2000,26(12):2697-2711
The aim of this work was to study how nitrogen availability affects within-plant allocation to growth and secondary metabolites and how this allocation affects host selection by herbivores. Tomato plants (Lycopersicon esculentum) were grown at six levels of nitrogen availability. When nitrogen availability increased, plant relative growth rate increased, but tissue carbon/nitrogen ratio in the second oldest true leaf and allocation to large glandular trichomes (type VI) as well as to the defense compounds rutin and chlorogenic acid decreased. Leaf protein concentration increased. Two-spotted spider mite (Tetranychus urticae) females responded significantly to these changes: in dual choice tests they preferred leaf disks from plants grown at high nitrogen availability, with a low C/N ratio. This preference persisted in an olfactometer in which the mites were offered only the odors released by leaves with damaged trichomes. We conclude that in a tomato leaf increased nitrogen availability leads to decreased allocation to defenses, and that repellent volatiles released by trichomes play a key role in affecting leaf selection by two-spotted spider mite females. 相似文献
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[目的]石榴小爪螨近年在陕西汉中危害园林建筑植物樟树,亟需筛选有效药剂进行防治。[方法]利用6种杀螨剂、按药膜法对其雌螨实施毒力测定,分析急性触杀效果。[结果]各供试杀螨剂致死浓度对数值与雌螨校正死亡率机率值相关显著,毒力回归式斜率为1.59~3.70,LC50值为0.3~4540.6μg a.i./L,而LC95值为1.0~48981μg a.i./L。毒力强弱次序为15%苯丁.哒螨灵乳油>15%哒螨灵乳油>2%阿维菌素乳油>30%哒螨灵可湿性粉剂>25%三唑锡可湿性粉剂。以三唑锡LC50值为标准估算,苯丁.哒螨灵相对毒力指数为12986倍,其他杀螨剂位此极值间。[结论]供试杀螨剂都能以较低剂量杀死石榴小爪螨实验种群;其LC95值的10倍浓度可用作户外防治此螨的参考剂量。 相似文献
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柑桔全爪螨抗药性监测及主导抗性机制的初步研究 总被引:6,自引:0,他引:6
本文提出了柑桔全爪螨对11种常用农药的相对敏感基线,1992 ̄1994年在四川地区和泸州地区监测了柑桔全爪螨对一些常用农药如三氯杀螨醇,水胺硫磷,甲氰菊酯,三氟氯氰菊酯和氧乐果的抗生水平。作者还根据生测结果提出了柑桔全爪螨对水胺硫磷和甲氰菊酯的可能的抗性机制。 相似文献
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几种药剂对玉米红蜘蛛的室内和大田药效 总被引:1,自引:0,他引:1
几种杀螨剂对玉米红蜘蛛窜内药效结果显示:对玉米红蜘蛛的主要种类--截形叶螨第7天的室内防效为28%哒螨灵乳油(78.3%)>240 g/L螨危FS(76.7%)>1.8%阿维菌素乳油(72.O%)>40%炔满特乳油(65.9%)>40%氧乐果乳油(63.3%)>2.5%溴氰菊酯乳油(58.3%).大田试验结果表明:30 d后以240 g/L螨危FS 150 mL/hm2的效果最佳,防效为76.8%;氧乐果由于在当地长期使用,效果已经很不理想,防治效果只有38.7%. 相似文献
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Jasmonic acid (JA) and the octadecanoid pathway are involved in both induced direct and induced indirect plant responses. In this study, the herbivorous mite, Tetranychus urticae, and its predator, Phytoseiulus persimilis, were given a choice between Lima bean plants induced by JA or spider mites and uninduced control plants. Infestation densities resulting in the induction of predator attractants were much lower than thus far assumed, i.e., predatory mites were significantly attracted to plants that were infested for 2 days with only one or four spider mites per plant. Phytoseiulus persimilis showed a density-dependent response to volatiles from plants that were infested with different numbers of spider mites. Similarly, treating plants with increasing concentrations of JA also led to increased attraction of P. persimilis. Moreover, the duration of spider mite infestation was positively correlated with the proportion of predators that were attracted to mite-infested plants. A pretreatment of the plants with JA followed by a spider mite infestation enhanced the attraction of P. persimilis to plant volatiles compared to attraction to volatiles from plants that were only infested with spider mites and did not receive a pretreatment with JA. The herbivore, T. urticae preferred leaf tissue that previously had been infested with conspecifics to uninfested leaf tissue. In the case of choice tests with JA-induced and control leaf tissue, spider mites slightly preferred control leaf tissue. When spider mites were given a choice between leaf discs induced by JA and leaf discs damaged by spider mite feeding, they preferred the latter. The presence of herbivore induced chemicals and/or spider mite products enhanced settlement of the mites, whereas treatment with JA seemed to impede settlement. 相似文献
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Jiao Zhu Giovanni Renzone Simona Arena Francesca Romana Dani Harald Paulsen Wolfgang Knoll Christian Cambillau Andrea Scaloni Paolo Pelosi 《International journal of molecular sciences》2021,22(13)
Spider mites are one of the major agricultural pests, feeding on a large variety of plants. As a contribution to understanding chemical communication in these arthropods, we have characterized a recently discovered class of odorant-binding proteins (OBPs) in Tetranychus urticae. As in other species of Chelicerata, the four OBPs of T. urticae contain six conserved cysteines paired in a pattern (C1–C6, C2–C3, C4–C5) differing from that of insect counterparts (C1–C3, C2–C5, C4–C6). Proteomic analysis uncovered a second family of OBPs, including twelve members that are likely to be unique to T. urticae. A three-dimensional model of TurtOBP1, built on the recent X-ray structure of Varroa destructor OBP1, shows protein folding different from that of insect OBPs, although with some common features. Ligand-binding experiments indicated some affinity to coniferyl aldehyde, but specific ligands may still need to be found among very large molecules, as suggested by the size of the binding pocket. 相似文献
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乙唑螨腈与乙螨唑混配对柑橘全爪螨的防治效果 总被引:1,自引:0,他引:1
[目的]明确乙唑螨腈与乙螨唑混配对柑橘全爪螨的室内联合生物活性以及对柑橘全爪螨的田间防治效果。[方法]主要采用喷雾法测定了乙唑螨腈与乙螨唑混配对柑橘全爪螨的室内联合生物活性,并在田间完成了乙唑螨腈与乙螨唑桶混防治柑橘全爪螨的田间药效试验。[结果]乙唑螨腈与乙螨唑在1:4~4:1的混配比例下对柑橘全爪螨成螨的CTC值在110.64~129.25之间,对柑橘全爪螨螨卵的CTC值在118.73~162.06之间。在广西和四川进行的2点乙唑螨腈和乙螨唑桶混防治柑橘全爪螨田间验证试验结果表明:乙唑螨腈与乙螨唑混配防治柑橘全爪螨,药后3 d防效达86%以上,速效性与乙唑螨腈单剂对照相当;药后20 d防效达73%以上,持效性略高于单剂对照。[结论]室内联合生物活性测定结果表明:乙唑螨腈与乙螨唑在1:1~2:1的比例范围内混配,对柑橘全爪螨表现出一定的增效作用。田间药效试验结果表明:乙唑螨腈和乙螨唑桶混对柑橘全爪螨具有较好的防治效果,推荐桶混剂量为乙唑螨腈100 mg/L与乙螨唑55.0 mg/L。 相似文献