自制植物农药实验初报

农药杀虫剂的面世既为农业上战胜病虫害带来了福音，也给病毒、病菌和害虫的演变进化创造了条件。如今农作物病虫害产生抗药性的种类越来越多，抗药性的扩散导致农药的使用寿命缩短，多重抗药性的产生，致使出现杀不死的“超级害虫”。人类几乎面临与农药杀虫剂问世前的年代相似的威胁，还得担当高投     

潮汕地区茄科农药植物资源

主要报道了潮汕地区茄科农药植物资源及其开发利用的前景。     

浅谈植物源农药

植物源农药作为生物农药的重要组成部分,成为目前各国研究的热点,通过植物源农药的特点、研究和开发途径、开发和使用时应注意的问题等几个方面作了综述,展望开发应用前景.     

植物源农药

本文概述了植物源农药特点、应用研究现状及展望。     

白云山农药植物资源的初步研究

初步介绍了白云山的农药植物资源现状，并就开发利用农药植物资源提出了建议。     

浅谈植物源农药

本文综述了天然植物中的杀虫活性成分,植物源农药的特点和作用机理,重点介绍了当前植物源农药的开发途径,研究与应用现状等。提出了当前我国植物源农药开发与应用中亟待解决的问题,并展望了植物源农药的发展前景。     

承德市野生农药植物研究

通过对承德市的野生农药植物进行系统的调查和研究,共记录野生农药植物35科64属83种,对其利用部位和主要功能进行了分析,并对合理利用这些植物资源提出建议。     

植物农药漫谈

本文概述了植物农药的研究发展概况，介绍了用作农药的植物活性物质、化学戚分、杀虫机理及开发利用。     

不同植物农药及自交系对防治玉米螟试验

分别以面部、楝果、辣蓼为主提取的植物农药对玉米螟防治效果明显，其中以辣蓼效果为最佳；而供试的5个玉米自交系之间的抗螟性差异显著。     

Using Plant Clinic Registers to Assess the Quality of Diagnoses and Advice Given to Farmers: A Case Study from Uganda

Abstract

Purpose: This study developed a framework for quality assessment of diagnoses and advice given at plant clinics.

Design/methodology/approach: Clinic registers from five plant clinics in Uganda (2006–2010) were used to develop quality assessment protocols for diagnoses and advice given by plant doctors. Assessment of quality of diagnoses was based on five validation criteria applied on the ten most common crops. Quality of advice was assessed for the four major problems considering efficacy and feasibility.

Findings: The quality of diagnoses varied between crops, from 68% completely validated in maize to 1% in tomato. Complete and partially validated diagnoses were 44% of all queries. The remaining 56% were rejected. Several basic weaknesses were found in data recording and symptom recognition. A greater consistency and precision in naming diseases would increase the number of completely validated diagnoses. The majority of recommendations (82%) were assessed ‘partially effective’. ‘Best practice’ was recommended for 10% and ineffective advice was given in 8% of the cases with considerable variation between diseases.

Practical implications: Plant doctors need more training in symptom recognition, pest management and record keeping as well as better technical backstopping to solve unknown problems. Common standards and procedures for clinic data collection and analysis should be established, and roles and responsibilities clearly defined.

Originality/value: This is the first time plant clinic registers have been used to systematically assess quality of plant clinic services. Apart from being a valuable tool for quality assessment of extension, the plant clinic registers constitute a novel source of regular information about pests, diseases and farmer demand that can help improve decision-making of extension service providers, researchers, plant health authorities as well as information and technology providers.     

利用Maplnfo制作教学地图

本文介绍了利用Mapimfo软件制作教学地图的一些方法和经验。     

VB中弹出式菜单的制作

弹出式菜单是用户通过点击鼠标左键或右键而弹出的菜单,绝大部分应用程序都具有此项功能。文章介绍了弹出式菜单和一般下拉菜单的区别、弹出式菜单的特点,并具体阐述了利用VB语言制作出一个弹出式菜单的过程。     

利用PowerPoint制作FirstSearch多媒体课件

随着网络数据库的不断涌现与读者检索技能的不相适应之间矛盾的产生,制作多媒体课件显得尤为必要,介绍利用PowerPoint制作OCLC的FirstSearch数据库课件的设计思路及制作方法.     

运用信息技术实现英语教学方式的创新

在英语课堂上运用CAI进行教学,信息容量大,省时高效,有利于提高教学效率;生动形象,增强趣味性,图、形、声、色、情俱在,有利于加强听说训练;营造良好的语言环境,有利于强化语言的交际性.     

蔬菜中农残去除方法研究

以萝卜和菠菜为样品,采用正交试验,研究了不同方法组合对蔬菜中农残的去除效果.结果表明,去除根茎类蔬菜农残的方法组合为2%洗涤剂浸泡10min后,用自来水漂洗3次,每次1min后,再用沸水烫漂1min;去除叶菜类蔬菜农残的方法优化组合为2%洗涤剂浸泡15min后,用自来水漂洗2次,每次1min后,再用沸水烫漂1min.     

梅州茶叶农药残留现状及控制对策初探

通过调查得出梅州茶叶农药残留现状及其来源和产生原因,并针对梅州茶叶生产实际提出了一些切实可行的控制办法,为本市发展无公害茶提供了实施依据。     

利用几何画板做数学实验

计算机辅助教学为数学实验提供了必要的工具和手段 ,利用几何画板这一数学软件就数学观察实验、验证性实验和探索性实验分别作了例证 ,论述了数学实验对改变数学教学方法、提高教学质量和推进素质教育的必要性和重要性