共查询到19条相似文献,搜索用时 46 毫秒
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本文用积温法确定青杨虎天牛的羽化始盛期积温是932.8℃,盛末期积温是1217.3℃,从而为防治提供了有效依据。 相似文献
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青杨虎天牛的发生特点及防治技术 总被引:1,自引:0,他引:1
青杨虎天牛(Xylotrechus rusiticus)为天牛科脊虎天牛属昆虫,是国家林业局2004年发布的林业检疫性有害生物之一,是我国北方地区新暴发成灾的蛀干性害虫。它分布范围较广,寄主以杨树为主,同时为害柳属、桦属、栎属、椴属和榆属等林木。该虫隐蔽性强,在防治上极为困难,而遭受青杨虎天牛危害的林木,其生长极度衰弱,树木易断枝折头,直至死亡。 相似文献
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青杨虎天牛的生态学特性 总被引:9,自引:1,他引:9
青杨虎天牛 ( Xylotrechus rusticusPinnaens)属鞘翅目的天牛科 ,是危害杨树、柳树重要的蛀干害虫 ,近几年在齐齐哈尔、哈尔滨、绥化等地区大面积发生。为适应生产需要 ,在对该害虫发生规律进行研究的基础上 ,明确了青杨虎天牛发生与环境条件的关系。1 与寄主的关系与寄主种类的关系 青杨虎天牛在黑龙江省主要危害杨树 ,其次为柳树、桦树、柞树、榆树 ,在杨树中又以中东杨、大青杨和小青杨为主 ,其次为小叶杨、厚皮杨、小黑杨、斯大林杨、小青×黑。就同一林地而言 ,林缘比林内受害重 ,孤立木比群栽林受害重 ,粗皮树种比光皮树种受害重。… 相似文献
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青杨脊虎天牛对13种植物挥发物的电生理及行为反应 总被引:1,自引:0,他引:1
测定青杨脊虎天牛雌、雄成虫对13种植物挥发物的电生理和行为反应.结果表明:丁香酚、2-苯乙醇、糠醛、柠檬烯、月桂烯5种挥发物在最大浓度下(1 mol·L-1)均能引起雌雄成虫强烈的触角电位反应(P<0.01);行为反应测试表明:柠檬烯在高于或等于10- mol·L-1的浓度时对雌虫均有引诱作用(P<0.01),在1和10-1 mol·L-1浓度下能够引诱雄虫(P<0.01);丁香酚于10-1和10-1 mol·L-1浓度下对雌、雄成虫均有引诱作用(P<0.01);2-苯乙醇在10-1和10-2 mol·L-1浓度下均能引诱雌、雄成虫(P<0.01);浓度为1和10-1 mol·L-1的糠醛对雌、雄成虫产生驱避作用(P<0.01);月桂烯只在10-1 mol·L-1 浓度下对雌、雄成虫有引诱作用(P<0.01);其他挥发物对青杨脊虎天牛均无明显定向作用. 相似文献
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1Xylotrechus rusticus(Linnaeus) is one of the most destructive woodborers in northeast China; it damages poplar and is listed as a domestic forestry quarantine pest. Overwintering larvae were collected during October 2012 and March 2013 in Harbin, China, to quantify indicators related to the insect's overwintering strategy and the major cryoprotectants. The supercooling points(SCPs), which ranged from –14.7°C to –2.9°C, were higher than the lethal temperatures of LT50(–33.64°C) and LT99(–40.17°C) after 24 h exposure., also the minimum mean daily temperature(–24.5°C) and mean monthly temperature(–18.0°C) at the sampling site in January during 2008–2012. Thus, X. rusticus is a typical freezing-tolerant insect. Glycerol serves as a major cryoprotectant for overwintering larvae, because it was the only polyol accumulated during the winter and it also had a significant negative correlation with the SCP(p= 0.033, R =0.907). The glycogen and lipid are major sources of energy and their levels decreased substantially in the middle of overwintering, when glycogen had a significant correlation with the SCP(p= 0.006, R =0.971) whereas the lipid contents did not. Moreover, inter-conversions between glycerol and glycogen, as well as mannose and glycogen, were suggested by their negative correlations. The water content did not change obviously during the winter and was not correlated with the SCP. The free amino acids in the hemolymph and the total protein contents of the bodies of larvae changed significantly during winter, although both had no correlations with the SCP. 相似文献
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通过正交试验研究以收率为指标的CO2超临界萃取小叶杨树皮挥发物的最佳萃取工艺条件.结果表明:萃取压力25 MPa、温度50℃、时间60 min为小叶杨树皮挥发物的最佳萃取条件,收率为3.56%;依此条件分别萃取白城二号杨、小黑杨、俄罗斯杨、中东杨、小青杨、小青×黑杨、大青杨、斯大林杨、银中杨和小叶杨的树皮挥发物.采用气相色谱-质谱联用(GC-MS)技术对挥发物的化学组成及相对含量进行测定.结果表明:挥发性物质主要包括醛类、酯类、酸类、烃类等化合物,其中以酸类物质含量最高,其他物质含量均较低;萘、醌、奠、酮等大分子物质含量较少;中东杨和斯大林杨树皮中特异化合物种类较多.同时利用"Y"形嗅觉仪测定青杨脊虎天牛对10种杨树树皮100 μL挥发物的行为反应.结果表明,雄成虫对小青杨的选择率54.17%,为最高;雌成虫对小青x黑杨的最大选择率为58.33%,其次是对小青杨和中东杨的选择率54.17%.雄成虫对10种杨树树皮CO_2超临界萃取液的选择率差异不显著(P>0.05),而雌成虫呈显著差异(P<0.05). 相似文献