Development, manufacture and application of Beta-Cypermethrin aqueous capsule suspension

The optimal formula of Beta-Cypermethrin aqueous capsule suspension was screened out through the experiment,preparation and manufacture of basic formulas, which has no sedimentation, suspended drops of oil, peels and agglomerating and the diameter of capsule is in range of 10-30μm, conformed to the technical requirement. The aftereffect of the 3.3% Beta-Cypermethrin aqueous capsule suspension which was manufactured according to the optimal formula was up more than 25 days. The experiments on controlling the larvae of Dendrolinmus superans Butler and the adults of Xylotrechus rusticus L were carried out with different concentrations of this chemical. The death rate reached 80% when 250 times solution of the chemical was sprayed on stem to control the larvae of D. superans. For control of the adults of X. rusticus, 200, 400 and 600 times solution of the chemical were applied and their control effects (death rate) reached 85.23%, 74.21% and 66.59% respectively. Two kinds of solution (200 times and 300 times) of the chemical were used to control the larvae of D. superans in large area, and the control effect for both concentrations was over 90%.     

银中杨抗病虫性研究

用室内外接种及自然感病的方法，对银中杨抗烂皮病进行测定，采用系统聚类方法进行分析，结果证明银中杨为感病最轻品种，聚在第一类，并对鉴定林中　１６个品系的病情指数作方差分析，结果表明各品系间感病指数有极度显著差异。同时对银中杨及对照品种的虫害按五级分类标准进行调查并计算受害指数，结果表明银中杨是抗杨干象、白杨透翅蛾等虫害的优良树种。     

人工林害虫的生态控制策略

森林害虫的科学管理必须考虑长远的经济效益和社会效益问题，只有对森林害虫进行生态控制才能达到森林可持续经营的目的。在人工林构建中，只有模拟天然林结构，从害虫栖息地抗虫林分结构出发，才能从根本上解决猖獗成灾问题。在对黑龙江省主要造林树种的天然抗虫结构、人工混交林和人工纯林的结构及害虫发生情况进行对比分析的基础上，提出了人工林害虫生态控制策略。     

影响松毛虫赤眼蜂种群消长因子研究

１９８６－１９９０年的研究得知：松毛虫赤眼蜂在浙江于３月下旬开始活动，１０月上旬至１１月陆续以蛹在马尾松毛虫、云南松毛虫等虫卵中越冬在林中常年都可见到该蜂的活动，其种群数量出现的高峰期与松毛虫卵期相一致，林中昆虫卵的多少、蜜源植物的有无、温度的高低、是影响松毛虫赤眼蜂林间种群消长的主要因子。     

Herbivory by the pine weevil (Hylobius abietis L.) and short-snouted weevils (Strophosoma melanogrammum Forst. and Otiorhynchus scaber L.) during the conversion of a wind-thrown Norway spruce forest into a mixed-species plantation

The influence of above-ground insect herbivory and other agents of damage to seedlings was studied in a field experiment. Nine different tree species were planted in each of five randomised blocks. The species were: Alnus glutinosa (L.) Gaertner, Betula pendula Roth., Fagus sylvatica L., Fraxinus excelsior L., Larix eurolepis Henry, Picea abies (L.) Karst., Prunus avium L., Quercus robur L. and Tilia cordata Mill. The seedlings were monitored through the 2000–2002 growing seasons. Pine weevils (Hylobius abietis L.) fed significantly more on Norway spruce seedlings than on all other tree species. The following rough preference order was obtained: Norway sprucelarch>birch, beech, oak>cherry>alder, ash, lime. Thus, during the conversion of single-species coniferous plantations to mixed-species broadleaved stands, the use of costly insecticides against pine weevil is not required. Short-snouted weevils (e.g. Strophosoma melanogrammum Forst. and Otiorhynchus scaber L.) and other insects caused leaf and needle area loss primarily during the first growing season.     

探析黄桃栽培技术及储存方法

黄桃富含丰富的维生素C以及人体所需的纤维素等多种微量元素,能够补充人体机能,而且黄桃还具有润肠通便、美容养颜、保护视力等功效,对人体健康也有好处.目前,国内果蔬市场上对黄桃的需求不断增加,为免出现供不应求的现象,必须加快黄桃优质高产栽培技术的推广与应用,基于此,该文结合黄桃栽培技术及储存方法进行深入探究,从科学选址、优...     

昆虫几丁质合成关键酶功能及其RNAi技术在害虫防治中的研究进展

几丁质对昆虫的生长发育至关重要,且不存在于植物和哺乳动物中,因此其合成途径的关键酶是较为理想的杀虫剂靶标。近年来,多种害虫的几丁质合成关键酶基因被克隆和鉴定,通过RNAi技术应用于一些重要害虫的防治研究工作中。本文较为系统的总结了近些年害虫几丁质合成关键酶的基因克隆及功能研究进展,重点阐述了几丁质合成酶、海藻糖酶基因基于RNAi技术应用于害虫防治取得的研究进展,分析了RNAi技术通过转基因植物表达dsRNA（RNAi抗虫作物）以及作为核酸农药（dsRNA）直接进行作物喷施的两种应用途径,文章最后还探讨了RNAi在害虫防治中面临的主要瓶颈问题以及主要应对策略。上述较为系统的归纳和总结,目的是为今后基于几丁质合成关键酶的RNAi技术应用于害虫绿色防控研究提供有价值的理论指导。     

彩叶树种乌桕实生苗培育技术

乌桕是集观形、观叶、观果于一体的优良园林绿化树种,同时也是我国特有的重要工业用木本油料树种,经济价值极高。该文总结了乌桕实生苗培育技术,主要包括采种、育苗、病虫害防治等,为乌桕的推广种植提供一定参考。     

基于Android的茶树病虫害信息采集系统

为了快速、方便地进行茶树病虫害信息的采集与实时求助,减少病虫害造成的损失,该文基于An？droid平台的茶树病虫害信息采集系统,详细介绍了该系统的总体框架、主要功能及关键实现技术。重点围绕虫害信息浏览、虫害信息采集2个方面,分别就其中的一些关键技术点（经度纬度获取及分布图生成、照相功能、文件上传功能等）进行阐述,以期实现茶树病虫害实时求助、快速诊断和信息检索。     

哈尔滨市不同生境区域鞘翅目昆虫多样性

[目的]探讨鞘翅目昆虫多样性变化对不同生境类型的生态反应。[方法]选取哈尔滨市不同生境区域中的样地,分析鞘翅目昆虫的群落结构及其多样性。[结果]共获得鞘翅目昆虫标本3 215个,隶属鞘翅目55科120属233种,其中以小蠹科（Scolytidae）等为优势类群。东北林业大学林场多样性指数最高,其次是哈尔滨植物园,帽儿山实验林场老山实验站最低。帽儿山实验林场老山实验站物种丰富度和优势度指数最高,其次是东北林业大学林场,哈尔滨植物园最低。不同生境类型的鞘翅目昆虫群落多样性的时间动态不同,哈尔滨植物园的鞘翅目昆虫群落多样性指数随时间的波动最小,帽儿山实验林场老山实验站的物种数和优势度指数波动较大。不同生境区域鞘翅目昆虫相似性系数为中等不相似或极不相似水平,说明各生境类型的鞘翅目昆虫栖息地空间异质性较大,导致鞘翅目昆虫群落间相似性程度较低。[结论]该研究可为城市生态可持续发展、森林生态系统的多样性保护提供科学依据和理论基础。