阿维菌素.噻嗪酮不同药量对柑桔粉虱的防治效果研究

为了探讨阿维菌素?噻嗪酮悬浮剂对柑桔粉虱的防治效果，本文选用15%阿维菌素?噻嗪酮悬浮剂等6种不同药剂处理，在广西桂林地区对柑桔粉虱进行防治效果试验。阿维菌素?噻嗪酮悬浮剂对柑桔粉虱1-2龄幼虫有较好的防治效果，药后15天供试低、中、高三浓度等防治效果分别为72.5%、81.3%、85.9%，对照药剂1.8%阿维菌素乳油、25%噻嗪酮可湿性粉剂、3%莫比朗乳油等防治效果分别为89.5%、81.8%、80.5%。     

上海青中双甲脒和噻嗪酮农药残留分析

采用样本匀浆液与层析硅胶一起过柱的方法,对上海青样本中残留的噻嗪酮和双甲脒进行净化处理后,经气相色谱外标法对两种农药的残留量同时进行定量分析。结果表明,噻嗪酮和双甲脒在优化色谱条件下色谱峰的相对保留时间分别为1.78 min和6.40 min,两种农药在10~100μg/mL的浓度范围内线性关系良好,双甲脒的线性回归方程为Y=-0.000424 0.320558X,噻嗪酮的线性回归方程为Y=0.743658X 1.243762,相关系数均在0.999以上。双甲脒的残留量为64.48μg/kg,噻嗪酮的残留量为32.56μg/kg,平均添加回收率为89.47%~111.43%,平均RSD为1.38%~6.77%。     

Field evolution of insecticide resistance in the brown planthopper (Nilaparvata lugens Stål) in China

The brown planthopper (Nilaparvata lugens Stål) is one of the most destructive pests of rice crops in Asian countries including China, Vietnam, Thailand, etc. Evolution of resistance in this pest insect to isoprocarb, buprofezin, pymetrozine, imidacloprid and other neonicotinoid insecticides has been reported. In order to investigate the current status of resistance to commonly used insecticides, nine field populations of N. lugens were collected from Central China, East China and South China, and resistance to insecticides was monitored from 2009 to 2012. All the 9 field populations collected in 2012 had developed extremely high resistance to imidacloprid, with resistance ratios (RR) ranging from 209.3 to 616.6. Resistance to imidacloprid was much higher in 2012 than in 2009. The RR of thiamethoxam varied from 17.4 to 47.1, and the RR of nitenpyram varied from 1.4 to 3.7 in 2012. Of the 9 field populations, six populations showed higher resistance to nitenpyram in 2012 than in 2011. RR for buprofezin varied from 110.1 to 221.6 in 2012 whereas resistance was at a medium level (RR 20.4 ∼ 39.4-fold) in 2009. RR for pymetrozine ranged from 34.9 to 46.8 in 2012. As for isoprocarb, RR ranged from 21.7 to 38.1 in 2012. The obvious increase in resistance to widely applied insecticides indicates that insecticide resistance management strategies are urgently needed to prevent or delay further increase of insecticide resistance in N. lugens.     

噻嗪酮对褐飞虱作用方式及其田间应用研究

在室内以不同生测方法测定了噻嗪酮对褐飞虱若虫的毒力,结果表明:噻嗪酮对褐飞虱若虫的活性主要是触杀作用;噻嗪酮也具有一定的内吸作用,但难以由叶片渗透转移到叶鞘部位起杀虫作用。在田间试验中,噻嗪酮对褐飞虱和白背飞虱的防治效果明显高于叶蝉散和甲胺磷,以每亩2.5～5克有效成份的剂量在褐飞虱大发生代前一代的若虫中期施用,既有效控制了当代飞虱,又压低了大发生代飞虱的数量。在田间试验中,噻嗪酮对稻田蜘蛛的数量影响很小。     

几丁质合成抑制剂类杀虫剂的发展和应用

本文重点介绍了苯酰基脲类、噻嗪酮这两类几丁质合成抑制剂类杀虫剂的发展概况和应用的有关杀虫特性及其目前在防治几类农作物害虫方面的应用情况,分析了其在应用方面的主要问题,并对其前景进行了讨论。     

噻嗪酮对稻纵卷叶螟F1代生存的影响

噻嗪酮对稻纵卷叶螟Ｆ_１代生存的影响陈忠孝，胡国文，凌逸军（中国水稻研究所，杭州３１０００６；江苏农学院，扬州２２５００１）ＥｆｆｅｃｔｏｆＢｕｐｒｏｆｅｚｉｎｏｎＦ_１ＧｅｎｅｒａｔｉｏｎＳｕｒｖｉｖａｌｏｆＲｉｃｅＬｅａｆ－ｆｏｌｄｅｒ￥ＣＨＥＮＺ...     

假眼小绿叶蝉的生态控制与合理用药

采用室内观察和田间系统调查相结合的方法,探明了茶园蜘蛛中的跳蛛和管巢蛛是捕食叶蝉的优势类群,其优势种主要为白斑猎蛛、花腹纽蛛、警戒蝇豹、棕管巢蛛、褶管巢蛛,它们的日捕食量在蛛蝉比1∶40的范围内,随猎物密度的增加而增加,其中以蛛蝉比为1∶10—1∶20时,捕食量的增长率最高。茶园蜘蛛的年发生数量消长呈马鞍型,即;春、秋多,夏季少。优乐得是一种治蝉效果好、且能保护天敌的理想农药。田间小区试验和大田对比试验结果表明,合理使用这种农药、并辅之以及时采摘、冬前行间覆盖稻草等农艺措施,能够获得较好的生态控制效果和经     

18%虱病灵可湿性粉剂气相色谱分析法

用长１．５ｍ 、内径２ｍ ｍ，内装５％ ＯＶ－１７Ｃｈｒｏｍｓｏｒｂ Ｗ－ＨＰ（１５０～１８０μｍ ）的玻璃柱，以火焰离子化检测器，在相同色谱条件下，对噻嗪酮和三唑酮进行了定量分析；其标准偏差和变异系数分别为０．０９６、０．０７１和０．９４％ 、０．９４％ ，添加回收率分别为９８．７７％ ～１００．３％ 和９８．２０％ ～１００．０％ 。     

Effect of buprofezin on adult life span,oviposition, egg hatch and progeny production of the cotton whitefly,Bemisia Tabaci

The 50% survival ofBemisia tabaci Genn. females was reduced to 5.9 days by exposure to bean seedlings treated with 1000 ppm buprofezinvs 8.9 days in the control. At lower concentrations ranging from 50 to 500 ppm, survival was extended to 11.8–14.2 days. Mean fecundity was significantly reduced on plants treated with 1000 ppm as compared with the control, whereas at 50 to 500 ppm the oviposition period was extended with a considerable increase in mean fecundity, irrespective of concentrations. Overall mean percent hatch dropped gradually from 25.8 to 12.9 with increase of concentration from 50 to 1000 ppm, as against 96.9% in the control. The survival of hatched nymphs was greatly affected at all buprofezin concentrations. No immature stages survived at 50, 100, 250 and 500 ppm; nymphal survival was 13.8, 7.0, 1.9 and 1.2%, respectively, as against 81.6% in the control.     

Laboratory and field evaluation of <Emphasis Type="Italic">Beauveria bassiana</Emphasis> for controlling Mulberry whitefly <Emphasis Type="Italic">Pealius mori</Emphasis> Takahashi (Homoptera: Aleyrodidae) in mulberry (<Emphasis Type="Italic">Morus alba</Emphasis> Linn)

In a laboratory screening of 12 isolates of entomopathogenic fungi against nymphs of the mulberry whitefly (Pealius mori Takahashi), Beauveria bassiana (Balsamo-Crivelli) Vuillemin CKB-048 was the most virulent, causing 87 ± 3% mortality at 1 × 10⁶ conidia/ml. Infection was confirmed by growth of the fungus from cadavers and by scanning electron microscopy of treated nymphs. Beauveria bassiana CKB-048 was formulated as a wettable powder (1 × 10⁹ conidia/g) and tested in two mulberry (Morus alba Linn) plantations in central and northeastern Thailand. In both locations, two spray applications of B. bassiana CKB-048 at 3.75 × 10¹² to 6.25 × 10¹² conidia/ha and at 14 day intervals provided good control of whitefly nymphs; control with B. bassiana CKB-048 was comparable to that with the pesticide buprofezin at 250 g of active ingredient/ha. In addition, no mortality of silkworm larvae occurred when the larvae were fed with mulberry leaves sprayed with B. bassiana CKB-048 7, 14, or 21 days earlier.