共查询到19条相似文献，搜索用时 739 毫秒
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玉米弯孢菌叶斑病药剂防治研究 总被引：1，自引：0，他引：1
用9种杀菌剂对玉米弯孢菌叶斑病菌（Curvularialanata）的抑制作用进行了室内皿测定试验，结果表明，代森锰锌、百菌清、退菌特对病菌分生孢子萌发有明显的抑制作用，EC50分别是1.61μg/ml、2.11μg/ml、8.23μg/ml；退菌特、多硫合剂、甲基托布津、多菌灵对病菌菌丝生长有明显的抑制作用，EC50分别为10.58μg/ml、24.76μg/ml、30.34μg/ml、34.21μg/ml。田间试验结果表明，退菌特的防病效果最好，为90.70%，百菌清、多菌灵、多硫合剂、甲基托布津、福美双、普得丰、代森锰锌也有较好的效果，防效在86.10%～72.52%之间。 相似文献
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用9种杀菌剂对玉米弯孢菌叶斑病菌（Curunlaria lanata)的抑制作用进行了室内皿测定试验，结果表明，代森锰锌、百菌清、退菌特对病菌分生孢子萌发有明显的抑制作用，EC50分别是1．61μg/ml,2.11μg/ml,8.23μg/ml；退菌特、多硫合剂、甲基托布津、多菌灵对病菌菌丝生长有明显的抑制作用，EC50分别为10．58μg/ml,24.76μg/ml,30.34μg/ml，34．21μg/ml,34．21μg/ml。田间试验结果表明，退菌特的防病效果最好,为90．70％，百菌清、多菌灵、多硫合剂、甲基托布津、福美双、普得丰、代森锰锌也有较好的效果，防效在86．10％－72．52％之间。 相似文献
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二氧化氯防治棉花枯萎病探讨 总被引：1，自引：0，他引：1
为探讨ClO2用于防治棉花枯萎病的效果，通过和市场上常用的杀菌剂多菌灵、甲基托布津进行田间对比试验，结果表明：采用添加1％～2％棉花专用添加剂的80ppm ClO2溶液，用灌根和喷雾相结合的办法，其平均死亡率可低达2．7％，而多菌灵、甲基托布津平均死亡率分别为19．3％和16．2％．可以看出，添加1％～2％的添加剂ClO2溶液防治效果明显优于多菌灵和甲基托布津． 相似文献
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9种药剂对玉米弯孢叶斑病菌的室内抑菌实验 总被引：4，自引：0，他引：4
在实验室内，用生长速率法和孢子萌发法观测杀菌剂扑海因、百菌清、速克灵、烯唑醇、新万生、多菌灵、腈菌净，春雷霉素，甲基托布津埘新月弯孢菌的抑菌作用。结果表明，扑海因和新万生对新门弯孢菌的菌落生长和孢子萌发均有强的抑制作州，速克灵次之。 相似文献
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8种杀菌剂对苦瓜枯萎病菌的室内毒力测定 总被引：1，自引：0，他引：1
采用生长速率测定法和分生孢子萌发抑制率法,在舍药PDA平板上和凹玻片上分别测定8种杀菌剂对苦瓜枯萎病尖孢镰刀菌的毒力作用。结果表明：20％五氯硝基苯DP对菌丝生长的抑制作用最强,EC50值为8．37mg／L,其次为40％五硝·多菌灵WP、12．5％戊唑醇WP、50％多菌灵WP和75％百菌清、聊,EC50值分别为：10．61mg／L、10．65mg／L、12．62mg／L、15．40mg／L。12．5％戊唑醇WP和对孢子萌发抑制作用最强,EC50值为3．68,20％五氯硝基苯DP、25％腈菌唑EC、40％五硝·多菌灵Ⅵ巾、50％多菌灵WP次之,EC50值分别为4．81mg／L、8．51mg／L、9．90mg／L、11．17mg／L。 相似文献
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试验用75%百菌清可湿性粉剂进行了苹果斑点落叶病大田药效试验。结果表明,75%中迅百菌清400～500倍液对苹果斑点落叶病有良好防治效果。 相似文献
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沈东阳 《闽西职业技术学院学报》2006,8(2):130-131
用86.2%铜大师、75%可杀得和75%百菌清等3种不同药剂进行柑桔疮痂病防治田间药效试验,于用药后7d、14d、21d分别调查发病情况,结果表明这几种药剂间的防治效果差异非常显著,其中以86.2%铜大师1000倍的防治效果最佳。 相似文献
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通过对2个云杉八齿小蠹伴生蓝变真菌的试验研究,结果表明：2个蓝变菌菌株适宜生长温度均为25℃;对酸碱度的适应能力强,在pH4．0～9．0范围内均能生长,在酸性环境下发育较好;以葡萄糖和果糖为最佳碳源,最佳氮源为甘氨酸,此外菌株Ophiostoma penicillatum 1也可很好利用酵母粉．甲基托布津、扑海因对2个试验菌株的生长有极强的抑制效果,百菌清和中生菌素仅对Ophiostoma penicillatum 2有很强的抑制效果,可杀得和硫酸链霉素对所有菌株的抑制作用均不明显． 相似文献
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小麦叶锈病是河南省小麦的重要病害之一.2009～2010年对河南省南阳市小麦叶锈病发生进行了系统调查.2009年病害始发于4月8日,此时田间病叶率为0.56%;4月22日～29日病害进入快速增长期,仅7d病叶率由4.11%速增至34.11%,病情指数由0.51攀升至6.57.5月6日病叶率和病情指数分别达78.78%和29.95,之后增速逐步减缓.2009年病情消长表现出＂S＂型曲线特征.2010年叶锈病的初发期与2009年相比约推迟了一个月,且病情显著减轻.通过对气象因子进行比较,推测2月～4月份的平均气温异常偏高是造成2009年南阳市小麦叶锈病严重发生的主要原因之一. 相似文献
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Liu ZY Huang JF Shi JJ Tao RX Zhou W Zhang LL 《Journal of Zhejiang University. Science. B》2007,8(10):738-744
Detecting plant health conditions plays a key role in farm pest management and crop protection. In this study, measurement of hyperspectral leaf reflectance in rice crop (Oryzasativa L.) was conducted on groups of healthy and infected leaves by the fungus Bipolaris oryzae (Helminthosporium oryzae Breda. de Hann) through the wavelength range from 350 to 2 500 nm. The percentage of leaf surface lesions was estimated and defined as the disease severity. Statistical methods like multiple stepwise regression, principal component analysis and partial least-square regression were utilized to calculate and estimate the disease severity of rice brown spot at the leaf level. Our results revealed that multiple stepwise linear regressions could efficiently estimate disease severity with three wavebands in seven steps. The root mean square errors (RMSEs) for training (n=210) and testing (n=53) dataset were 6.5% and 5.8%, respectively. Principal component analysis showed that the first principal component could explain approximately 80% of the variance of the original hyperspectral reflectance. The regression model with the first two principal components predicted a disease severity with RMSEs of 16.3% and 13.9% for the training and testing dataset, respec-tively. Partial least-square regression with seven extracted factors could most effectively predict disease severity compared with other statistical methods with RMSEs of 4.1% and 2.0% for the training and testing dataset, respectively. Our research demon-strates that it is feasible to estimate the disease severity of rice brown spot using hyperspectral reflectance data at the leaf level. 相似文献
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张英 《河北北方学院学报(医学版)》2005,22(1):65-66
目的:观察冠心宁、银杏叶注射液治疗冠心病心绞痛的疗效.方法:治疗组52例予冠心宁注射液、银杏叶注射液各10ml,每日一次静脉滴注,疗程2周,其它治疗方法与对照组50例相同.分别观察主要症状、体征变化,记录心绞痛发作次数,监测心电图、血粘度变化.结果:治疗组心绞痛、心电图总有效率(94.0%、88.0%)与对照组有效率(70.0%、68.0%)比较有显著性差异(P＜0.05),治疗组的血粘度的降低明显优于对照组(P＜0.05).结论:冠心宁、银杏叶注射液治疗冠心病心绞痛疗效确切. 相似文献
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用40％达科宁胶悬剂500、750、1000倍液，在常年花生叶斑病发生较重的地块上于花生盛花期，喷施花生茎叶．试验表明，用40％达科宁胶悬剂500-750倍液防治花生叶斑病效果好，促进了花生生长，提高了花生产量。 相似文献
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INTRODUCTION In recent years poinsettia cultivation has blos-somed from a small garden business into a multimil-lion-dollar industry in China. Some fungal diseases, such as Rhizoctonia stem and root rot, Pythium root rot, Fusarium wilt, and Botrytis blight have been reported to cause considerable damage during propagation (Sun et al., 2003). A new bacterial dis-ease characterized by leaf spot appearance was first observed on poinsettia in October 2003, in the Xiaoshan district of Zhej… 相似文献
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In October 2003, a new bacterial disease with symptoms similar to those caused by Xanthomonas axonopodis pv.poinsettiicola was observed on poinsettia leaves at a flower nursery in Zhejiang Province of China. Three Xanthomonas strains were isolated from infected plants and classified as X. axonopodis. They were differentiated from the pathotype strain LMG849 of X. axonopodis pv. poinsettiicola causing bacterial leaf spot of poinsettia by comparison of pathogenicity, substrate utilization and BOX-PCR genomic fingerprints. 相似文献
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利用降碱灵（签剂）进行田间比较试验,探索其对白肋烟上部叶开片及主要化学成分的影响,结果表明：上部叶平均叶长增大13．48％～13．83％,叶宽增宽20．89％～22．99％,叶片增宽率大于叶长增长率;产量、产值、均价等经济性状差异较小,而外观质量有明显改善;化学成分上部叶总氮量下降0．29％～0．30％,烟碱量下降0．60％～0．63％;中部叶总氮下降0．05％～0．09％,烟碱下降0．35％～0．37％;总氮、烟碱量上部叶降幅大于中部叶;烟叶钾含量增加,且上部叶增率大于中部叶．综合效果A处理优于B处理． 相似文献
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对保护地蔬菜根结线虫的分类学地位、发生规律、为害症状进行了总结归纳，并从选用抗病品种、生物防治、农业防治等方面对根结线虫无公害防治措施进行了分析。 相似文献
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Item stem formats can alter the cognitive complexity as well as the type of abilities required for solving mathematics items. Consequently, it is possible that item stem formats can affect the dimensional structure of mathematics assessments. This empirical study investigated the relationship between item stem format and the dimensionality of mathematics assessments. A sample of 671 sixth-grade students was given two forms of a mathematics assessment in which mathematical expression (ME) items and word problems (WP) were used to measure the same content. The effects of mathematical language and reading abilities in responding to ME and WP items were explored using unidimensional and multidimensional item response theory models. The results showed that WP and ME items appear to differ with regard to the underlying abilities required to answer these items. Hence, the multidimensional model fit the response data better than the unidimensional model. For the accurate assessment of mathematics achievement, students’ reading and mathematical language abilities should also be considered when implementing mathematics assessments with ME and WP items. 相似文献