共查询到18条相似文献，搜索用时 437 毫秒
1.
抚顺地区森林昆虫资源调查研究 总被引：1，自引：0，他引：1
调查了解森林昆虫种类组成，以及不同林分类型的森林害虫分布范围和危害状况，林木害虫的天敌种类、数量及利用价值等，不仅对治理森林害虫，保护森林安全发挥积极作用，而且对天敌昆虫的利用提供理论依据。于1984-1995年，对辽宁省抚顺地区的森林昆虫资源进行了较深入的调查研究。通过调查，已发现该地区的森林昆虫种类有18目、185科、l660种，基本摸清了各林分娄型的主要森林昆虫种类．并提出了防治对策。 相似文献
2.
3.
中国林木害虫天敌昆虫利用研究进展 总被引：5，自引：0，他引：5
中国已记述有关林虫天敌昆虫约1500种,对近200种天敌的生物学、生态学作了研究。本文分三个方面简要介绍林木食叶害虫寄生昆虫、枝干害虫寄生昆虫和捕食性昆虫的利用研究概况。 相似文献
4.
5.
第二讲天敌资源调查一、天敌资源调查的意义天敌资源调查是昆虫区系调查的内容之一。目的在于查明当地主要害虫各个虫期的天敌种类、自然控制效率、季节性种群变动规律及地理分布等。对本地天敌资源没有调查,就不了解害虫有哪些天敌,它们对害虫数量变动的影响如何,也不知道在生物防治中该采用哪种天敌。我们对外地天敌资源没有了解,就不知 相似文献
6.
7.
8.
<正> 保护利用昆虫的天敌防治农林害虫是植物保护的重要途径之一,也是生物防治害虫的主要组成部分。害虫的天敌种类很多,有哺乳动物、鸟、禽类、爬虫类,两栖类、鱼类、蜱螨类和各种食虫昆虫、线虫、病菌和病毒等。这些天敌在自然界中,对抑制害虫 相似文献
9.
花椒波瘿蚊天敌种类初报 总被引：1，自引：0，他引：1
本文介绍陇南地区为害花椒的主要害虫花椒波瘿蚊及其重要天敌昆虫种类，并探讨利用天敌昆虫控制花椒波瘿蚊的可能性，同时对重要天敌的生物学特性作了初步观察。 相似文献
10.
2003~2007年,对辽阳县森林昆虫资源进行了普查,结果表明:我县森林昆虫共有18个目166科1337种,其中:天敌昆虫262种,占森林昆虫总数的19.6%;重要害虫25种,占总数的1.9%。明确了不同林分类型中的主要害虫种类和捕食性、寄生性天敌昆虫种类。 相似文献
11.
12.
13.
14.
调查、分析、研究了西双版纳自然保护区不同生境昆虫群落的种群、种类区系组成、分布特点。提出建立昆虫防治研究站、建立病虫害管理技术档案等昆虫资源管理方面的建议,并分析了昆虫资源在食用、药用、观赏、害虫天敌等方面的利用价值。 相似文献
15.
16.
利用花绒寄甲防治锈色粒肩天牛 总被引：7，自引：1，他引：6
室内在器皿内和半自然条件下,利用花绒寄甲对锈色粒肩天牛进行寄生性试验,最佳效果分别达80%和86.67%。林间在山东泰安、聊城等地选取5处被锈色粒肩天牛危害的国槐行道树作为试验地,释放花绒寄甲成虫、卵块对锈色粒肩天牛幼虫进行生物防治试验。以天敌释放前后被害株虫口数为依据,对花绒寄甲的防治效果进行评价。林间各处理最佳防治效果为:单纯释放花绒寄甲成虫、卵块后,株虫口减退率分别为72.23%和71.67%,同时释放花绒寄甲成虫及卵块时,其株虫口减退率为82.64%。但3者间差异不显著。林间释放花绒寄甲成虫和卵块,对锈色粒肩天牛均有良好的控制效果。 相似文献
17.
18.
Insect pest problems in tropical agroforestry systems: Contributory factors and strategies for management 总被引：1，自引：1，他引：0
Agroforestry trees are attacked by a wide spectrum of insects at all stages of their growth just like other annual and perennial crops. Pest management in agroforestry has not received much attention so far, but recent emphasis on producing high value tree products in agroforestry and using improved germplasm in traditional systems, and emergence of serious pest problems in some promising agroforestry systems have increased awareness on risks posed by pests. Insects may attack one or more species within a system and across systems in the landscape, so pest management strategies should depend on the nature of the insect and magnitude of its damage. Although greater plant diversity in agroforestry is expected to increase beneficial arthropods, diversity by itself may not reduce pests. Introduction of tree germplasm from a narrow genetic base and intensive use of trees may lead to pest outbreaks. In simultaneous agroforestry systems, a number of factors governing tree—crop—environment interactions, such as diversity of plant species, host range of the pests, microclimate, spatial arrangement and tree management modify pest infestations by affecting populations of both herbivores and natural enemies. Trees also affect pest infestations by acting as barriers to movement of insects, masking the odours emitted by other components of the system and sheltering herbivores and natural enemies. In sequential agroforestry systems, it is mostly the soil-borne and diapausing insects that cause and perpetuate damage to the common hosts in tree—crop rotations over seasons or years. An integrated approach combining host-plant resistance to pests, exploiting alternative tree species, measures that prevent pest build up but favour natural enemies and biological control is suggested for managing pests in agroforestry. Species substitution to avoid pests is feasible only if trees are grown for ecological services such as soil conservation and low value products such as fuelwood, but not for trees yielding specific and high value products. For exploiting biological control as a potent, low cost and environmentally safe tool for pest management in agroforestry, research should focus on understanding the influence of ecological and management factors on the dynamics of insect pest-natural enemy populations. Scientists and policy makers in national and international institutions, and donors are urged to pay more attention to pest problems in agroforestry to harness the potential benefits of agroforestry.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献