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1.
嘧菌酯对几种植物病原真菌的室内活性测定   总被引:8,自引:1,他引:7  
程根武  刘赢  祁之秋  纪明山 《农药》2005,44(4):190-191
试验结果表明,嘧菌酯对供试8种植物病原真菌具有很高的活性,既可抑制病菌菌丝生长又能抑制孢子萌发。水稻纹枯病菌的菌丝对嘧菌酯最敏感,EC50为0.0185mg/L;嘧菌酯对辣椒根腐病菌孢子萌发的抑制作用最明显,EC50达到0.0104mg/L。  相似文献   

2.
25%嘧菌酯水悬浮剂对作物主要病害的杀菌谱测定   总被引:1,自引:0,他引:1  
时春喜  龙书生  俞征  邹刚 《农药》2005,44(2):93-94
室内测定结果表明:25%嘧菌酯SC对所供试15种不同作物的病原菌均有较显著的抑制效果,EC50值均低于5.0μg/g,EC50值也仅为50μg/g左右。在不同浓度条件下,各供试病菌的菌落生长速率差异十分明显,表明随着药剂浓度的提高,对病菌抑制作用显著增加,充分表明了25%嘧菌酯SC抑菌活性的广谱性。  相似文献   

3.
肟菌酯对9种植物病原真菌室内活性测定   总被引:2,自引:0,他引:2  
汪汉成  祁之秋  王建新  陈长军  周明国 《农药》2006,45(11):780-781,789
室内测定结果表明,50%肟菌酯WG对供试的9种重要植物病原真菌均有较强的抑制活性。孢子萌发法及对黄瓜霜霉病和黄瓜白粉病的活体试验测得其EC50值均低于3.6008μg/mL,EC50值均小于801ag/mL,但对水稻恶苗病菌孢子萌发的影响较小。除灰霉病菌外,药剂对供试病原菌菌丝生长具抑制作用,尤其对水稻稻瘟病菌和水稻稻曲病菌有特效,其EC90值分别为0.0246μg/mL和0.0446μg/mL,但对番茄早疫病菌、辣椒炭疽病菌、水稻恶苗病菌的抑制作用不随药剂浓度的提高而增强。  相似文献   

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创制杀菌剂烯肟菌酯生物活性及应用(Ⅱ)--小麦白粉病   总被引:5,自引:5,他引:0  
烯肟菌酯对小麦白粉病的盆栽杀茵活性(EC90值)为28.307μg/ml;田间小区试验结果一致表明,烯肟菌酯在50~100μg/ml的处理剂量下,施药1~2次,对小麦白粉病具有较好的防治效果,防效在65.50%~87.48%之间。  相似文献   

5.
刘君丽  司乃国  陈亮  张冬明  张宗俭 《农药》2004,43(3):103-105
啶菌恶唑(SYP—Z048)对番茄叶霉病有较高的杀菌活性,离体活性EC50值为0.29μg/ml,盆栽试验结果EC90为90.66μg/ml;田间小区试验结果表明:25%啶菌恶唑乳油使用剂量为200~400ga.i./hm^2,施药2~3次,能有效控制番茄叶霉病的发生与危害,防效与腈菌唑相当,优于多菌灵、甲基硫菌灵及代森锰锌。  相似文献   

6.
新型杀螨剂嘧螨酯对柑橘红蜘蛛的生物活性   总被引:3,自引:2,他引:1  
测定了新型杀螨剂嘧螨酯对柑橘红蜘蛛雌成螨和卵的毒杀活性,结果表明,处理后24h,嘧螨酯原药与30%嘧螨酯胶悬剂对雌成螨的LC50值分别为4.67μg/ml和5.68μg/ml,处理后48h,分别为1.50μg/ml和1.97μg/ml;处理后第10d,对卵的LC50值分别为1.561μg/ml和1.58μg/ml。30%嘧螨酯胶悬剂对柑橘红蜘蛛具有优异的防效。  相似文献   

7.
张雅  张传清  刘少颖  朱国念 《农药》2006,45(12):856-858
研究了灰霉病菌(Botryotis cinerea)对甾醇脱甲基抑制剂(DMIs)的敏感性,结果表明供试的3种DMIs类化合物抑制灰霉病菌菌丝生长的活性依次为戊唑醇〉戊菌唑〉三唑酮。戊唑醇对采自浙江、江苏、山东三地的114株灰霉病菌菌丝生长的有效抑制巾浓度(EC50)值在0.001—0.917μg/mL之间,平均为0.225μg/mL;戊菌唑的EC50值在0,007-3.590μg/mL之间,平均为0.644μg/mL;三唑酮的EC50值在0.040-83.646μg/mL之间,平均为9.032μg/mL。同时,未发现供试的3种DMIs类化合物与目前在生产上应用的苯并咪唑类、二甲酰亚胺类、N-苯胺基甲酸酯类和苯胺基嘧啶类等主要灰霉病防治药剂之间存在交互抗药性。  相似文献   

8.
11种杀菌剂对水稻纹枯病菌的毒力比较   总被引:2,自引:0,他引:2  
采用菌丝生长速率法测定了11种杀菌剂对水稻纹枯病菌的抑菌活性。结果表明,水稻纹枯病菌对三唑类杀菌剂己唑醇、苯醚甲环唑、腈菌唑、戊唑醇、烯唑醇、三唑醇的敏感性依次下降,EC50值均在0.5μg/mL以下,EC90值均低于10μg/mL;水稻纹枯病菌对1227和C8—10两种季铵盐阳离子表面活性剂的敏感性高于井冈霉素,但低于三唑类杀菌剂,EC50分别为15.0394μg/mL和4.0735μg/mL;水稻纹枯病菌对苯并咪唑类杀菌剂甲基硫菌灵和多菌灵毒力差异较大,甲基硫菌灵抑菌活性低于井冈霉素,EC50为10.2330μg,/mL,多菌灵的抑菌活性远高于井冈霉素,其毒力与三唑类药剂相当,其EC50为0.2656μg/mL。  相似文献   

9.
常用杀菌剂及其复配剂对番茄灰霉病菌的毒力测定   总被引:15,自引:0,他引:15  
张从宇  高智谋  岳永德 《农药》2003,42(8):28-29
常用杀菌剂对番茄灰霉病菌的毒力不同,速克灵、多菌灵、扑海因、乐克的EC50均小于0.5μg/ml;灰霉净、退菌特、菌克得、甲基托布津、福美双的EC50均小于5μg/ml。百菌清的EC50在10μg/ml左右。速克灵与多菌灵按1:1的比例复配增效显著,按1:2、1:3、1:4的比例复配有一定的增效作用;速克灵与乐克按1:1、1:2、1:3、1:4的比例复配也有一定的增效作用。  相似文献   

10.
烯肟菌酯对葡萄霜霉病的盆栽杀菌活性(EC90值)为31.797μg/ml;田间小区试验结果表明,烯肟菌酯在100-200μg/ml的处理剂量下,施药2~3次,间隔7~10d,可有效地防治葡萄霜霉病的危害,并有提高产量和品质的作用。  相似文献   

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Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.  相似文献   

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In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.  相似文献   

14.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

15.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  相似文献   

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Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

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