阿克苏地区枣树红蜘蛛的发生与防治

阿克苏地区枣树发生叶螨危害,常见的为山楂红蜘蛛、苹果红蜘蛛、二斑叶螨。现将其发生规律和防治技术介绍如下。1发生规律1.1山楂红蜘蛛一般位于叶背面为害,叶片受害后出现黄褐色斑点,于叶背吐丝拉网,此虫一年发生6～7代,以受精的朱红色冬型雌虫在主干或侧     

苹果园山楂叶螨田间药剂防治试验

山楂叶螨的发生与高温干旱气候有关，叶螨繁殖盛期在7月上句。选用5种药剂进行叶螨防治试验，20％螨死净乳油2500倍液、40％水胺硫磷乳油1000倍液、灭扫利3000倍液防治效果较好；40％氧化乐果1000倍液和20％三氯杀螨醇乳油800倍液防治效果较差。     

柑桔红蜘蛛发生规律及其防治

柑桔红蜘蛛是为害柑桔的重要害虫，其消长和为害程度的主导因素是温度和湿度，特别是温度最为关键。红蜘蛛在吴江地区主要是以卵在叶片反面越冬，防治红蜘蛛的主要措施是生草覆盖柑桔园以及双甲脒、苯丁锡和克螨特等药物防治。     

梨花象甲发生规律及无公害防治技术

梨花象甲(Arthonomus pomorum Linne.)是危害梨花的重要害虫,本文介绍了该虫的形态特征、危害特点及发生规律,提出了防治适期和无公害防治技术。     

果树红蜘蛛的发生与防治

红蜘蛛属蜱螨目、叶螨科，是为害果树的重要害虫，每年发生较普遍，防治不力时，往往会给果农造成严重损失。为害果树的红蜘蛛主要有山楂红蜘蛛、苹果红蜘蛛、苜蓿红蜘蛛。三种红蜘蛛常混合发生，但在不同的年份或地区，就是同一地区的不同时期，主次常有变动，但各地仍以山楂红蜘蛛发生普遍。     

苹果树山楂红蜘蛛的发生与防治

红蜘蛛（Tetranychus viennensis Zacher）属蜱螨目、叶螨科；主要危害仁果类果树（苹果、梨、山楂等）。危害苹果的红蜘蛛主要有山楂红蜘蛛、苹果红蜘蛛、苜蓿红蜘蛛。     

红蜘蛛的综合防治

近些年来,红蜘蛛已成为危害园林花卉树木的重要害虫之一.它主要危害植物的叶、茎、花等,剌吸植物的茎叶,使受害部位水分减少,表现失绿变白,叶表面呈现密集苍白的小斑点,卷曲发黄.严重时植株发生黄叶、焦叶、卷叶、落叶和死亡等现象.同时,红蜘蛛还是病毒病的传播媒介.     

山楂红蜘蛛的综合防治

近几年来矿业集团绿地中,红蜘蛛的危害相当严重,造成植株早期落叶,严重影响了观赏效果。它主要危害山楂、樱桃、樱花、碧桃、海棠等树种。刺吸植物的叶片进行危害,使叶片受害的部位水分减少,导致叶片失绿变白,叶片表面呈现密集苍白的小斑点,危害严重的植株发生黄叶、卷叶、落叶     

卡死克防治红蜘蛛试验初报

经试验证明，应用卡死克防治山楂红蜘蛛和苹果红蜘蛛具有效果高、成本低、残效期长的特点，掌握在害螨发生前期用药一次，即可达到全年螨口密度在防治指标之内。     

Influence of host plant species on the development and reproduction of hawthorn spider mites

A leaf disc bioassay was employed to investigate the influence of host species of deciduous fruit trees, like apple, peach, plum, cherry and apricot, on the development and reproduction of the hawthorn spider mite Tetranychus viennensis Zacher in the laboratory under conditions of 25±1°C, 60±10% RH and a photoperiod of 16 h: 8 h light: dark. This was done by determining the duration of each life stage of the mites, the intrinsic rate of population increase (r _m ), mean generation time (T) and net reproductive rate (R ₀) of the spider mites on each of the host plant species. Differences in life table parameters of the spider mite among host plants were analyzed with the jack-knife method. The results indicated that plum might be the best suitable plant for the spider mite among the plants tested due to shorter developmental period and higher intrinsic rate of increase, whereas cherry and apricot were least suitable due to their long developmental duration and low intrinsic rates of increase. When the spider mites were transferred from apple to other fruit trees, negative effects on developmental duration, fecundity and life table parameters were found in the first generation, but the effects faded out in succeeding generations. When transferred onto plum and peach, the spider mite adapted to the new hosts in the second generation; however, on cherry and apricot, it adapted in the third generation. __________ Translated from Acta Ecologica Sinica, 2005, 27(7) [译自: 生态学报, 2005, 27(7)]     

苹果再植病的致病因素及防治措施

苹果再植病广泛存在于世界各地主要苹果产区,严重威胁果园的生产,由此带来的经济损失是巨大的.本文主要从苹果再植病的类型、表现、致病因素(生物因素和非生物因素)以及防治措施等方面概述了十几年来人们在这方面的研究进展情况.     

丁营飞播区松毛虫发生规律及综合防治措施应用效果的研究

对滦平县丁营飞播区1987--1990年油松毛虫的发生规律进行调查研究,并对1999年丁营飞播区再次暴发油松毛虫灾害,采取综合防治技术措施后对松毛虫种群的影响进行了研究。结果表明,要实现松毛虫可持续控制,关键是对播区油松毛虫防治起始指标的准确确定,采取多种综合防治技术措施,达到实现生态系统的良性改善,松毛虫种群控制在有虫不成灾的水平。     

抚顺地区落叶松八齿小蠹为害规律及其防治方法

落叶松八齿小蠹属于次期害虫，即在伐倒木、生长衰弱木和砧死木上产卵、繁殖、为害。由于抚顺地区2000-2001两年的严重干旱，造成大面积的落叶松林林被旱死，给落叶松八齿小蠹的猖獗发生创造了有利条件。为控制其传播、蔓延和为害，我们紧密结合生产实际，对该虫为害规律及防治方法进行了探索，并取得了初步效果。     

我国森林啮齿动物的发生及防控措施研究现状

该文系统地阐述了我国森林有害啮齿动物的种类、分布及危害的研究进展，论述了鼠害的防控措施，分析了当前防治工作中的重点问题和研究热点。     

云南省松墨天牛生物学特性和地理分布研究

松墨天牛是云南省近年来危害云南松最为严重的蛀干害虫之一。该虫在滇中地区1a发生1代．以3、4龄幼虫在寄主枝干的木质部内越冬。成虫3月下旬羽化，4月上、中旬为羽化盛期。由于该虫在云南省的寄主分布广，繁殖条件适宜，加之扩散途径多、种群密度大等因素，致使分布范围迅速扩散，造成极大的直接和潜在危害。文中针对松墨天牛在云南省的危害特点提出防治措施。     

隆回县石漠化治理措施与成效

阐述了隆回县石漠化治理的现状及采取的主要治理措施和取得的成效,分析其存在的问题,提出了隆回县今后石漠化治理的建议。     

马尾松林昆虫及蜘蛛群落的研究报告

１９９２－１９９４年，在浙江马尾松林里进行昆虫及蜘蛛群落，松毛虫天敌和种群动态的分析。结果表明：（１）１５年生马尾松针叶立体分布，确认砍枝取薪以留７轮为好，不低于留４轮；（２）马尾松林昆虫群落分属１８目１１８科，其中直翅目，鞘翅目，同翅目，膜翅目，半翅目占优势，经测定，龙游县落结构复杂，分布均匀，群落与层次，坡向，郁闭度，灌层盖度关系密切；（３）蜘蛛群落分属１９科４６种，其中萧蛸科，猫蛛科和蟹蛛科     

Acaricidal and oviposition deterring effects of santalol identified in sandalwood oil against two-spotted spider mite, <Emphasis Type="Italic">Tetranychus urticae</Emphasis> Koch (Acari: Tetranychidae)

Thirty-four plant essential oils were screened for their acaricidal and oviposition deterrent activities against two-spotted spider mite (TSSM), Tetranychus urticae Koch (Acari: Tetranychidae), in the laboratory using a leaf-dip bioassay. From initial trials, sandalwood and common thyme oils were observed to be the most effective against TSSM adult females. Subsequent trials confirmed that only sandalwood oil was significantly active (87.2 ± 2.9% mortality) against TSSM adult females. Sandalwood oil also demonstrated oviposition deterring effects based on a 89.3% reduction of the total number of eggs on leaf disks treated with the oil. GC–MS analysis revealed that the main components of the sandalwood oil were α-santalol (45.8%), β-santalol (20.6%), β-sinensal (9.4%), and epi-β-santalol (3.3%). A mixture of α- and β-santalol (51.0:22.9, respectively) produced significantly higher mortality (85.5 ± 2.9%) and oviposition deterrent effects (94.7% reduction in the number of eggs) than the control. Phytotoxicity was not shown on rose shoots to which a 0.1% solution of sandalwood oil was applied.     

Radial distribution patterns of the green moisture content in trunks of 46-year-old red cypress (<Emphasis Type="Italic">Chamaecyparis formosensis</Emphasis>)

Understanding the green moisture content and wood density is important for effective forest management. Radial distribution patterns in the green moisture content (MC) and basic density (BD) in stems of red cypress (Chamaecyparis formosensis) were investigated in 69 plantation trees that were 46 years old. An increment core was collected from each sample tree at breast height (1.3 m). Five radial positions were defined: pith piece (Pith), inner heartwood (IHW), outer heartwood (OHW), intermediate wood (TSH), and sapwood (SW). Results showed that the average MC was highly dependent on the individual tree. Average values of the MC obtained from the TSH were significantly lower than those for the other positions. The MC of heartwood was higher than that of SW. Distribution patterns of the MC in the radial direction varied among trees. Radial variations in MC and BD were greater than in between-tree variations. Six types of radial distribution patterns of MC were detected for sample trees. MC values increased with decreasing BD (except for the TSH). Positive correlations were found between adjacent sampling positions in both MC and BD.