不同寄主繁殖川硬皮肿腿蜂的寄生能力比较

在柏木段内分别采用双条杉天牛和黄粉虫幼虫培育川硬皮肿腿蜂,观察其在室内搜索寄生能力的差异,并利用双筒显微镜、扫描电镜和酯酶同工酶电泳技术试图找出其外部形态和内部遗传的差异。结果表明:以黄粉虫幼虫为替代寄主长期繁殖的实验室蜂在搜索寄生双条杉天牛的能力上明显低于以双条杉天牛为寄主繁殖的野外蜂,两者除了触角的板型感器和坛型感器的分布有差异外,在外部形态上和同工酶图谱上均未发现明显区别。     

双条杉天牛发生规律及综合防治技术研究

双条杉天牛主要危害柏类树木,具有隐蔽、爆发、不易防治等特点,对生态林、城市景观树木危害巨大,严重影响城市环境。文章论述双条衫天牛的生物学特性,并根据不同时期的发生特点,提出了针对性的防治措施。     

双条杉天牛防治与泰山古柏的科学管理

泰山古树是重要的世界自然遗产,而古柏在古树中占有重要地位。加强古柏的病虫害防治至关重要。而双条杉天牛是导致古柏死亡的主要害虫,作者根据双条杉天牛的习性,采用饵木诱杀法及综合管理措施,使树体复壮,从而有效控制了双条杉天牛等害虫的危害。     

粗鞘双条杉天牛的危害分布和抽样方法研究

本文采用聚集度指标、频次比较及回归分析方法对粗鞘双条杉天牛在杉木人工纯林的为害分布进行了研究.结果表明,粗鞘双条杉天牛在人工杉木林中为害分布属受密度制约的聚集型分布,其临界密度为m_0=2.5961株/样方;受害株的分布以植株群为基本单元,其形成是由于该天牛扩散活动能力弱,产卵范围比较集中所致.根据回归关系式m=0.6280 0.7905m,可确定随机抽样的理论抽样数θ,θ=t~2/D~2((a 1)/X β 1),以5种不同的抽样调查方法进行比较,结果以棋盘式和平行线抽样调查的结果精确度最高.     

A trial to detect optimal pin-pricking timing in evaluating the ability to form traumatic resin canals of <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> for selecting resistant trees to <Emphasis Type="Italic">Semanotus japonicus</Emphasis> (Coleoptera: Cerambycidae)

A trial to detect optimal pin-pricking timing in evaluating the ability to form traumatic resin canals (TRCs) of Cryptomeria japonica was examined to select resistant trees to Semanotus japonicus using 14 clones in 2001 and 2002. Resistance to S. japonicus and the ability to form TRCs in the phloem was evaluated by inoculating newly hatched larvae in the bark and by a pin prick, which was conducted every 10 days (four times) on the trunk around the larval phloem-feeding period, respectively. The larval survivorship varied greatly among clones for both years. The mean appearance of newly formed TRCs was generally higher in late treatment for both years, and the tangential width of them was also higher in 2001, whereas those of pre-formed TRCs were not higher for either year. The larval survivorship did not show significant correlations with the appearance and the width of pre-formed TRCs on all treatments. However, it showed significant negative correlations with the appearance of newly formed TRCs on the second and third treatments on the 2-year-old layer, although this was not significant with the width of them. This suggests that resistant clones might have the mechanism of rapidly forming TRCs when just at the stage of newly hatched larval entering the phloem. Thus, although the relationship between the appearance and the width of newly formed TRCs is not clear, pin-pricking treatment when the newly hatched larvae just enter the bark may be one of optimal times for the evaluation of the resistance of C. japonica to S. japonicus. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

辽宁地区林业有害生物双条杉天牛风险分析

对辽宁地区林业有害生物双条杉天牛[Semanotus bifasciatus(Motschulsky)]进行定性和定量风险分析。结果表明,双条杉天牛在辽宁地区危害影响农林生产,其风险评估值(R)为2.10,属于重度危险性林业有害生物,建议将其列为辽宁省补充林业检疫性有害生物。     

双条杉天牛研究进展

双条杉天牛是我国重要的蛀干害虫,严重威胁着一些地区的古柏和侧柏纯林。文章从其生物学特性、生态学特性和发生规律等方面综述了近年来的研究进展,比较了不同防治方法的作用效果,并提出了最佳的防治方案和注意事项。     

应用管氏肿腿蜂防治双条杉天牛技术研究

2001—2005年北京市密云县进行了管氏肿腿蜂防治双条杉天牛技术的研究与推广,5 a放蜂1200万头,累计防治面积3000 hm^2。管氏肿腿蜂5 a平均寄生率达69.68%,寄生率随着放蜂密度的增加而增加。林内放蜂后侧柏的被害率由放蜂前22.78%下降到0.49%;被害木虫口密度由25.4头/株下降到3头/株,下降率88.2%;被害木管氏肿腿蜂密度由放蜂前的0.2头/株上升到2005年的2.5头/株,基本达到有虫不成灾。     

皱鞘双条杉天牛生物学特性及防治试验初报

初步弄清了皱鞘双条杉天牛Ｓemanotus bifasciatus sinoauster在浙中地区的生物学特性，通过几种农药防治试验，结果显示，３５％快克乳油防治效果达９２％以上。     

侧柏挥发性化学成分的鉴定及其对双条杉天牛的触角电位反应

行为试验发现侧柏饵木对双条杉天牛有很强的引诱作用。采用顶空吸附采样方法林间采集侧柏不同部位的挥发性成分,经热脱附吹扫捕集-气相色谱-质谱联用分析,发现侧柏释放的挥发性成分主要由脂肪族的绿叶成分和单萜烯组成。固相微萃取和水蒸汽蒸馏采集侧柏韧皮成分,分析发现其主要成分由单萜烯、倍半萜烯及其衍生物组成,两种采样方法的采样效果有一定的差异。触角电位研究表明,双条杉天牛触角对挥发性绿叶成分正戊醇、正己醇、2-乙基-1-己醇和1-辛烯-3-醇有很强的触角电位反应;对醛类化合物触角电位反应较弱;对单萜烯类化合物香桧烯、侧柏醇和(-)-柠檬烯有很强的触角电位反应。双条杉天牛对小蠹虫的信息素都有很强的触角电位反应,特别是对3-甲基-2-环己烯-1-醇及其酮类化合物。含6个碳或8个碳的醇类成分与马鞭草烯酮结合和侧柏挥发性的单萜烯类成分对双条杉天牛寻找寄主的行为可能有很大影响。