防治水稻纹枯病药效试验

试验结果表明，大地春可湿性粉剂800倍和1000倍，20％纹利复配剂800倍和1000倍，12．5％纹益复配剂800倍和1000倍对水稻纹枯病具有很好的防效，分别为77．59％，71．95％，76．13％，67．14％，71．18％，65．17％，其防效相当或优于井冈霉素的防效。     

防治水稻纹枯病药效试验

试验结果表明,大地春可湿性粉剂800倍和1000倍,20%纹利复配剂800倍和1000倍,12.5%纹益复配剂800倍和1000倍对水稻纹枯病具有很好的防效,分别为77.59%、71.95%、76.13%、67.14%、71.18%、65.17%、其防效相当或优于井冈霉素的防效.     

怀化市水稻纹枯病的综合防治策略

本文在分析当前怀化市水稻纹枯病发生流行情况以及总结历年来防治方法的基础上，提出了“一主三辅”水稻纹枯病的综合防治措施．     

浅谈水稻纹枯病的防治

水稻纹枯病广泛分布于各水稻产区,尤以高产稻区受害最重.纹枯病可使植株茎秆、叶鞘干枯至腐烂,引起结实率下降,千粒重降低,发生严重时减产30-50%,甚至植株倒伏而绝产.因此纹枯病的成功防治是是水稻高产的保证.     

不同杀菌剂防治优质小麦纹枯病的研究

研究表明：优质小麦纹枯病的发生和普通小麦一样具有明显的阶段性。在不同阶段（主要是播种期和返青拔节期）分别用种衣剂、杀菌剂进行防治能起到良好的防治效果。药剂防治的最好组合是：播种期用14%小麦种衣剂拌种,返青拔节期（3月15日前后）用20%纹枯净可湿性粉剂喷雾。     

怀化市水稻纹枯病的综合防治策略

本在分析当前怀化市水稻纹枯病发生流行情况以及总结历年来防治方法的基础上，提出了“一主三辅”水稻纹枯病的综合防治措施。     

六种杀菌剂防治大棚黄瓜霜霉病药效试验

用抑快净、灭克、克露等六种杀菌剂防治大棚黄瓜霜霉病.试验表明52.5％抑快净WG1500倍和60％灭克WP1000倍 对黄瓜霜霉病防治效果显著,在发病前或初期每7d施1次药,共3次防效均在85％以上.     

水稻纹枯病生境生态位研究

水稻同一生育期各生境点之间的生态位功能指数存在差异，表现为田块中部＞北侧边线、西侧边线、东侧边线＞南侧边线＞田角。这说明在各生境位点上，水稻纹枯病菌对资源的占有和利用故能是不同的。在田中部水稻纹枯病菌对占有和利用最为充分，因此，水稻纹枯病菌的繁衍也最快，对水稻的危害也最大，而在田角则相反。水稻田的田角和田块南侧边线生境位点对水稻纹枯病的控制作用最强。     

新型高效无害化农药防治白菜蚜虫的药效试验初报

选择新型高效无害化的生物制剂为主 ,通过复配的杀虫剂对白菜蚜虫进行药效试验 ,结果表明 ,生物制剂完全能替代常用的氨基甲酸酯类农药和有机磷农药 ,且效果较好。     

C源、N源含量对水稻纹枯病菌生长的影响

采用二因素最优化设计方案，研究了培养基中C源、N源含量对水稻纹枯病菌生长的影响。结果表明在实验范围内[C源(淀粉)含量：5～55mg／mL，氮源(天冬酰胺)含量：0．05～3．95mg／mL]，N源对菌丝的生长、菌核鲜重及粒数的影响大于C源。根据综合分析，培养基中的C源和N源分别以45～47．5mg／mL及2．78～3．17mg／mL的组配对水稻纹枯病菌生长较为有利。     

玉米自交系478上纹枯病发生和防治研究

本文阐述沿淮及淮北地区玉米纹枯病在自交系478上的发生规律、流行的因素、危害损失以及防治要点。     

Enhancing rice resistance to fungal pathogens by transformation with cell wall degrading enzyme genes from Trichoderma atroviride

Three genes encoding for fungal cell wall degrading enzymes (CWDEs), ech42, nag70 and gluc78 from the biocontrol fungus Trichoderma atroviride were inserted into the binary vector pCAMBIA1305.2 singly and in all possible combinations and transformed to rice plants. More than 1800 independently regenerated plantlets in seven different populations (for each of the three genes and each of the four gene combinations) were obtained. The ech42 gene encoding for an endochitinase increased resistance to sheath blight caused by Rhizoctonia solani, while the exochitinase-encoding gene, nag70, had lesser effect. The expression level of endochitinase but exochitinase was correlated with disease resistance. Nevertheless, exochitinase enhanced the effect of endochitinase on disease resistance when the two genes co-expressed in transgenics. Resistance to Magnaporthe grisea was found in all kinds of regenerated plants including that with single gluc78. A few lines expressing either ech42 or nag70 gene were immune to the disease. Transgenic plants are being tested to further evaluate disease resistance at field level. This is the first report of multiple of expression of genes encoding CWDEs from Trichoderma atroviride that result in resistance to blast and sheath blight in rice.     

Enhancing rice resistance to fungal pathogens by transformation with cell wall degrading enzyme genes from Trichoderma atroviride

INTRODUCTION Rice sheath blight (Rhizoctonia solani) and rice blast (Magnaporthe grisea) are two serious plantdiseases in China. Rice cultivars with high level and durable resistance to these two pathogens are noteasy to obtain by traditional breeding methods due to the lack of germplasm resistant to R. solani and the high genetic diversity of M. grisea. Cell wall degrading enzyme (CWDE) genes from biocontrol fungi belonging to the genus Trichoderma have been demonstrated to encode …     

多功能种衣剂在水稻上的应用研究

多功能种衣剂在水稻上的应用研究表明；多功能种衣剂能有效降低苗高，增加绿叶数、分蘖数、整基宽、根数、干重、秧苗素质、有效穗数、穗实粒数、千粒重，并能有效降低杂草及病虫害的发生率，但对种子发芽有一定的抑制作用。多功能种衣剂１号、２号和３号处理均能显著提高水稻产量，其中以２号剂增产效果最显著，每公顷增产稻谷８６５公斤，增产９．８％。     

化学抗菌剂对哈茨木霉防治鱼腥草白绢病的协同作用

通过抑菌和拮抗实验筛选能与哈茨木霉协同抑制鱼腥草白绢病病原菌的化学抗菌剂,以盆栽实验证明所选化学抗菌剂与哈茨木霉对鱼腥草白绢病的协同防治效果,以为鱼腥草栽培过程中安全、高效防治白绢病提供指导.结果发现,三唑酮对鱼腥草白绢病病原菌具有较强的生长抑制作用,且对哈茨木霉的抑制作用较小,用250μg/ml的三唑酮溶液和30 g/m2哈茨木霉孢子粉联合处理可以降低鱼腥草白绢病发病率、延迟发病时间,防治效果明显好于单独用三唑酮或哈茨木霉处理.     

Dissipation of pencycuron in rice plant

INTRODUCTION Pencycuron [1-(4-chlorobenzyl)-1-cyclopentyl- 3-phenylurea], a relatively new non-systemic protec-tive fungicide for controlling sheath blight (Rhizoc-tonia solani) of rice (Sylvanie and Cornis, 1989; Tomlin, 1997), is expected to be used widely in ag-ricultural production particularly in Asia. However, information on the dissipation pattern of pencycuron in rice plant is lacking. Little information on the en-vironmental fate of pencycuron has been published although there …     

最优控制理论课程教学改革研究

最优控制这门课程着重于讨论最优控制理论在不同工程领域背景下的应用。借助于该理论,人们可以在各种控制函数中确定出最优解。本文首先概括了最优控制的理论框架,进而从教学内容、教学方法与教材等方面提出了一系列的教学改进措施。此外,并结合科研项目提高学生的认知、理解及应用能力。最后,给出了一个关于本课程改革的总结与展望。     

水稻微卫星标记的研究进展

微卫星又称简单重复序列,是一类由几个核苷酸(一般1～6个)为重复单元而形成的串联重复序列.由于它具有含量丰富、多态性高、共显性和检测方法简单等优点,而广泛应用于品种鉴定、种质资源保护、遗传作图、基因定位和QTL分析等方面.文章就微卫星标记在水稻中的开发和应用进展作一概述.