大棚黄瓜上烟粉虱成虫动态研究

对大棚烟粉虱成虫动态进行了研究.结果表明:烟粉虱成虫的聚集强度随密度的上升而下降;成虫始终处于聚集-扩散-再聚集-再扩散的动态过程之中.烟粉虱成虫在黄瓜植株上部充分展开的幼嫩叶片上数量最大;烟粉虱在大棚黄瓜上呈指数增长,其模型为Nt=2.5642e0.532t,(r=0.9858**).应用最优分割法将烟粉虱成虫动态划分为3个时期,分别为建立期、发展期和暴发期,在种群建立期对烟粉虱实施控制可以获得最佳的效果.     

Selective control of mite and collembolan pests of pastures and grain crops in Australia

Control of invertebrate pests in broad-acre agriculture largely relies on the application of broad-spectrum pesticides, however resistance problems and environmental concerns are driving a search for alternatives including more selective products. Here we explore the feasibility of using novel chemical groupings in the control of problematic pests that attack germinating pastures and grain crops in Australia. A modified laboratory bioassay is described for testing the response of several invertebrate pests to pesticides that have contact and systemic/translaminar properties. Two contact pesticides (fenitrothion and gamma-cyhalothrin) and three pesticides with strong systemic/translaminar properties (lambda-cyhalothrin, abamectin and diafenthiuron) showed promise for control of the collembolan Sminthurus viridis and four mite pests (Halotydeus destructor, Balaustium medicagoense, Penthaleus falcatus and Bryobia sp.). No single pesticide emerged as the most efficacious against all these pests, highlighting the need for correct pest identification before making control recommendations. Incorporating these new chemical options into pest control programs may help to control emerging pests and counter pesticide resistance issues. Selective pesticides in particular are likely to be compatible with integrated control programs that promote the establishment and maintenance of beneficial natural enemies.     

农村经济发展的思想动力分析

分析了新农村建设中农村经济发展的思想动力,主要包括以人为本,尊重农村利益;加强渗透性,为新农村三个文明建设服务;创新形式,提高思想政治工作的时效性.     

罗甸县马尾松种子园建立与经营

从优树选择、园址选择、嫁接技术等方面介绍了马尾松种子园的建立和经营管理技术,加速了罗甸县马尾松良种化进程,为获得不断提高的良种提供理论依据和科学保障,可以为马尾松良种选育与良种生产奠定坚实的物质基础。     

森林公园生态旅游环境保护体系的构建

概括了中国森林公园与森林旅游发展现状，并就森林旅游的开展对森林生态环境的影响，以及森林公园生态旅游环境保护体系构建的必要性进行了分析，在此基础上，提出了构建森林公园生态旅游环境保护体系应由教育体系、发展体系、监测体系、评价体系、防治体系、保障体系六大部分构成。     

浓缩梨汁生产过程中HACCP体系的建立及应用

将HACCP体系应用于浓缩梨汁的生产过程中,对浓缩梨汁的生产过程进行了危害分析,并确立了原料验收、后巴氏杀菌、灌装前过滤、发运前检查签封4个关键控制点,并根据生产的实际情况及实验确立了每个关键控制点的关键限值、监控和纠偏措施。同时对生产浓缩梨汁HACCP体系的有效运行做了说明和分析。     

建立玉米现代产业技术体系,加快玉米生产发展

玉米生产涉及多学科、多部门和多产业,形成独特的产业链条。玉米现代技术产业体系的建立必将大大加快我国玉米生产的发展。本文论述了玉米现代产业技术体系的内涵、玉米种质创新、育种取得的成就、存在的问题及其解决途径,玉米高产优质栽培理论与技术的发展现状与存在的问题,玉米产后加工的现状和前景。     

林业有害生物基层监测网络的建设与管理

本文通过对达县国家级森林病虫害中心测报点的监测网络体系及其管理方法的分析,对有关林业有害生物基层监测网络建设与管理等问题进行了阐述。     

Direct seeding as an alternative to transplanting for guayule in southeast Queensland

Guayule (Parthenium argentatum Gray) is a source of high quality rubber and low-allergenic latex. Commercial potential of guayule to produce high value latex products has increased due to the increased incidence of deadly diseases in humans. The objective of this study was to investigate the potential of direct seeding in southeast Queensland as an alternative to establishment by the current high cost transplanting method. Experiments were conducted for 2 years at Gatton, Queensland using physical and chemical seed treatments. NaOCl plus GA₃, osmo-priming with polyethylene glycol, seed pelleting and seed tape planting were tested. Planting depth had a significant influence on seedling emergence. Emergence at 18 mm depth (1.5 seedlings/m) was significantly reduced compared with 10 mm depth (2.9 seedlings/m). Osmo-priming was effective in increasing germination from 36 to 47%. It also improved seedling emergence and vigour. Osmo-priming significantly increased establishment (7.5 seedlings/m) compared with untreated seed (3.3 seedlings/m). NaOCl plus GA₃ did not have a significant influence on germination (38%) or seedling emergence (5.0 seedlings/m) but increased survival at 42 days after planting. Establishment as a percentage of emerged seedlings was high for both osmo-primed and NaOCl plus GA₃ treatments with 89 and 88% respectively, whereas untreated seed had only 70% survival. Osmo-priming also increased vigour as indicated by increased root length (101 mm), shoot height (123 mm), and seedling dry matter (379 mg/seedling) compared with the control (83, 107 mm and 206 mg/seedling, respectively).     

陕西秦岭自然保护区建设管理模式初步研究

1965以年,秦岭地区共建立各类自然保护区25个（其中水利部门4处）,总面积487 134.6 hm^2,占陕西省自然保护区总面积57.8%。但由于保护区级别、管理体制、管理部门以及资金投资主体不同等原因,使秦岭地区自然保护区的建设和管理水平参差不齐,自然保护区的保护功能没有充分发挥出应有的效益。本文通过对秦岭地区现有自然保护区的建设和管理的现状进行调查研究,提出建设一个大自然保护区的思路,即建设秦岭国家自然保护区,并指出适合秦岭地区保护区建设管理模式的优越性,提出了优化和改革秦岭自然保护区管理体制和完善运行机制的政策性建议。