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研究了几种杀菌剂对番茄叶霉病的防治效果。结果表明：供试杀菌剂对叶霉病都有明显的控制作用。其中以加瑞农防效最好,与杜邦克露相比差异达显著水平,与代森锰锌相比差异达到显著水平。其次为复方速克灵,但防效与其它药剂相比差异均不显著。 相似文献
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以黄瓜褐斑病菌、小麦纹枯病菌和番茄叶霉病菌为供试病原菌,用琼胶平板法对夹竹桃等10种植物样品的丙酮提取物进行了抑菌活性测定.结果表明：夹竹桃提取物对黄瓜褐斑病菌和番茄叶霉病菌菌丝生长抑制率大于70%,其中对番茄叶霉病菌菌丝生长抑制率达80.6%;花椒提取物对番茄叶霉病菌和小麦纹枯病菌菌丝生长抑制率均大于60%;南天竹对两种病原菌菌丝的抑制率为50%以上;小茴香、香菜等植物提取物在低浓度时对供试病原菌菌丝的生长有一定的促进作用. 相似文献
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四种农药分别采取两种使用方法进行玉米田间小区试验,通过药效测定,结果表明:各药剂在苗后24天防效均在85%以上,其中辛硫磷拌种及撒毒土防治效果最好,分别为95.69%和95.2%,明显优于其它供试药剂.各处理的防效均显著高于未施药的对照区.辛硫磷与呋喃丹、甲拌磷药剂之间防效差异达显著水平,而同一药剂在不同使用方法上差异不显著. 相似文献
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四种农药分别采取两种使用方法进行玉米田间小区试验，通过药效测定。结果表明：各药剂在苗后24天防效均在85%以上，其中辛硫磷拌种及撒毒土防治效果最好，分别为95.69%和95.2%。明显优于其它供试药剂。各处理的防效均显著高于未施药的对照区，辛硫磷与呋喃丹，甲拌磷药剂之间防效差异达显著水平，而同一药剂在不同使用方法上差异不显著。 相似文献
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测定了中草药对植物病原真菌的室内抑菌作用和田间防效.结果表明,白藓皮对小麦赤霉病、小麦纹枯病菌、小麦黑粉病菌、番茄灰霉病菌、番茄早疫病菌的菌丝生长,对番茄早疫病菌、番茄灰霉病菌、小麦赤霉病菌的孢子萌发具有较强抑制作用,0.2 g/mL白藓皮对番茄早疫病、番茄灰霉病、小麦赤霉病的防效分别为76.3%、82.3%和75.1%;胡椒对小麦纹枯病菌、小麦黑粉病菌、番茄早疫病菌、山芋黑疤病菌的菌丝生长,对番茄早疫病菌孢子萌发具有较强抑制作用,0.2 g/mL胡椒对番茄早疫病防效为74.5%;甘草对番茄早疫病菌菌丝生长和孢子萌发有较强抑制作用,0.2 g/mL甘草对番茄早疫病防效为70.9%. 相似文献
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用三种农药 (地虫净、地捕杀、呋喃丹 )、三种处理方法对玉米苗期地下害虫进行防治试验。结果表明 :三种农药与空白对照之间达到极显著的水平 ,地虫净、地捕杀、呋喃丹之间防效达显著水平 ,以地虫净效果最好。而在各种施药方法上 ,除地捕杀穴施外 ,其余都达 80 %以上的防效。 相似文献
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采用无公害生物农药叶不卷(2%阿维菌素)防治小菜蛾、菜青虫进行田间试验,并以乙酰甲胺磷、甲氰菊酯作对比,试验结果表明,叶不卷(2%阿维菌素)1000倍液防治小菜蛾、菜青虫效果最好,3天后调查,平均防效分别达91.9%、89.6%,药效期达10天.具有防效好、成本低、无污染等优点. 相似文献
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测定了11种木霉对黄瓜枯萎尖孢镰刀菌（Fusarium oxyaporum）、黄瓜黑星病瓜疮痂枝孢霉（Cladosporium cucumerinum）和番茄叶霉病褐孢霉（Fulvia fulva）的拮抗作用，筛选出1株M6粘绿木霉对3种病菌均有较强拮抗作用，而且对黄瓜枯萎病的室内盆栽防效可达65．66％。与此同时还观察到多数木霉生长速度快、生长繁茂，快速覆盖病原菌的菌落，竞争作用、抗生作用和重寄生作用是其主要作用机制。 相似文献
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《昆明师范高等专科学校学报》2014,(3)
试验采用田间额外浇水的方法,探索青霉菌灭活菌丝体制剂对增强烤烟诱导抗病效果的影响.结果显示:青霉菌灭活菌丝体制剂用量相同时,每株烟额外浇水9 L对株高的增加作用达极显著水平(P0.01);对烟草花叶病、白粉病和赤星病的抗性加强,但对黑胫病的防效不利.7.5 kg/hm2每株烟额外浇水9 L的处理对烟草花叶病、赤星病和白粉病的相对防效分别提高6.8%,11.5%和17.9%,对黑胫病的相对防效降低30.6%;15.0 kg/hm2每株烟额外浇水9 L的处理对烟草花叶病、赤星病和白粉病的相对防效分别提高10.9%,3.4%和16.8%,对黑胫病的相对防效降低26.6%. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献