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抚顺土区兴安落叶松鞘蛾Coleophora dahurica Fikv有寄生蜂11种,其中9种为老熟幼虫和蛹期寄生蜂,2种为1-2龄幼虫期寄生蜂。该文报道了寄生蜂种群的林间分布与森林面积及林冠层的关系,并对各寄生蜂种群在林间的活动时间及在林间羽化的始见期,高峰期和末期进行了系统调查。 相似文献
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兴安落叶松鞘蛾colephora dahurica Falk。寄生蜂共有13种,其中小蜂10种。采用投放糖水或蜂蜜溶液(1:10),落叶松鞘蛾幼虫及蛹体经研磨后过滤加蜂密(1:1),再稀释成1:10溶液的引诱物质以及保护蜜源植物等措施,可壮大寄生蜂和群,有效防治落叶松鞘蛾。7年实践证明,幼虫平均虫口密度由防治前的76/100cm,下降至1。25-3头/100cm,防治效果显著。 相似文献
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应用林丹烟剂大面积防治兴安落叶松鞘蛾对其寄生蜂种群有显著的副作用,可以导致寄生蜂总寄生率下降65.4%。特别对小蜂类群影响最大,可减少小蜂类群数量的63.8%,放烟后第3年防治区鞘蛾种群数量即可回升到接近放烟前的水平,而寄生蜂的数量却不到放烟前的1/2。放烟不仅可以直接减少寄生蜂的数量,还可以大量杀伤其中间寄主而间接影响寄生蜂数量的回升。 相似文献
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兴安落叶松鞘蛾(Coleoghora dahurica Flkv.)是落叶松林的一大害虫。黑龙江、吉林两省为害面积近200万亩,有虫株率达80%以上,虫口密度2.1—5.8头/10cm,严重威胁着落叶松人工林的生长。用烟剂防治,大量杀伤天敌,并杀害蜜蜂、污染环境、害及人畜。为此进行了寄生蜂对兴安落叶松鞘蛾控制作用的研究。笔者于 相似文献
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本文报道了鞘蛾双歧姬小蜂在抚顺地区不同林分类型中的种群分布特点,对林缘,林内和树冠层不同部位的种群数量,以及该蜂种群在林间活动的始期,盛期和末期进行了系统观察。 相似文献
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落叶松鞘蛾寄生蜂观察初报 总被引:1,自引:0,他引:1
<正> 落叶松鞘蛾Coleophora laricellaHübner是落叶松林的一大害虫。在黑龙江吉林两省为害面积近200万亩,有虫株率达80%以上,虫口密度2.1~5.8头/1Ocm,严重威胁着落叶松人工林的生长。采用烟剂防治,不仅大量杀伤天敌,而且杀害蜜蜂,污染环境,害及人畜.为此进行了寄生蜂对落叶松鞘蛾控制作用的研究.笔者于1973~1987年,分别在黑龙江省牡丹江林区和吉林省四平地区落叶松人工林内,对落叶松鞘蛾寄生蜂的发生、消长、寄生和利用,进行了试验研究。 相似文献
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采用扩散型指数Iδ、聚集度指标I和CA、平均拥挤度与平均密度的比值(X*/)、Taylor的b指数、Iwao的X*—回归检验和聚集均数λ检验,探讨了兴安落叶松鞘蛾幼虫在落叶松纯林中的空间分布型。结果表明:兴安落叶松鞘蛾幼虫在林间树冠不同方位都呈聚集分布。造成聚集分布的原因是该虫本身的生活习性。 相似文献
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对兴安落叶松鞘蛾越冬前后幼虫脂肪含量进行了测定,试图找出越冬前幼虫营养条件与脂肪含量的关系以及越冬前脂肪含量对越冬后的幼虫基数影响。 相似文献
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落叶松鞘蛾发生期预测预报的研究 总被引:1,自引:0,他引:1
采用1995~2004年10年时间的虫情调查资料,对落叶松鞘蛾发生期进行了系统研究,采用期距法建立了期距值表,并用一元回归法建立了回归预测模型,经验证,精度都比较高。 相似文献
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The control ofColeophora dahurica Flkv. by ULV spraying rare oil of malathior was popularized in Inner Mongolia Daxing’an Mountains in 1992–1993. The control
area was 32744.3 hm2, which was 98.2% of the suitable control area in Inner Mongolia Daxing’an Mountains and 75% of the suitable area in Inner
Mongolia respectively. Dosage was 1125 g/hm2. Control effectiveness was above 95%; the larvae density decreased from 52.5 to 0.94 per 50cm sample twig and direct economical
benefit was 3,935,420 Chinese yuan. 相似文献
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In the north Saxon lowlands (near Torgau), effects of conversion of pure pine stands (Pinus sylvestris L.) into mixed stands by planting deciduous trees [Fagus sylvatica L. and Quercus petraea (Matt.) Liebl] were investigated on parasitoid wasps as pest antagonists. The effects of planting deciduous trees in pine stands were investigated using the strategy of space-for-time substitution including advanced plantations of beech and oak of different age classes. Wasps were captured at 4-week intervals by ground photoeclectors (GPE, n=6, 1 m2) and flight-interception traps (FIT, n=8), placed in the tree crown layer during the vegetation period (April–October) of 2000. A total of 32,479 parasitoid wasps belonging to 30 families were caught in the traps. Fifty-nine percent of individuals were representatives of families relevant as antagonists of forest insect pests: Ichneumonidae, Braconidae, Pteromalidae, Eulophidae, Mymaridae, Trichogrammatidae, and Scelionidae. Compared to the pure pine stand, individual numbers of most families of parasitoid wasps were statistically significantly higher in mixed stands with deciduous trees. The clearest promoting effects of deciduous trees on parasitoid wasps were manifested in the oldest age classes of advanced beech and oak plantations. Oak exerted stronger effects than beech. This applied especially to the tree crown layer, the stratum with the highest spatial correlation between important phytophagous pine pests and relevant parasitoids. The increased structural diversity of the stands and the broader spectrum of potential hosts are regarded as key factors for the promoting effects of advanced plantings of deciduous trees in pine stands on the community of parasitoid wasps. 相似文献