共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
通过对竹蝗产卵地,3-4龄跳时间蝻和成蝗等各虫态发生面积的调查,统计分析得出竹蝗产卵地面积上块状分布,平均0.61亩。产卵地面积,3-4龄跳蝻面积以及竹蝗发生面积三者相关性强,本文建立了数学关系式,对竹蝗的预测预报有一定作用。 相似文献
3.
4.
通过对绥宁县楠竹虫害的持续调查与分析,并对发生状况作了简要阐述,总结出了相应的防治对策与措施,以期对防治楠竹虫害有理论与现实的指导意义。结果表明:绥宁县楠竹虫害主要有黄脊竹蝗、竹异缕舟蛾、灰顶竹毒蛾、竹长尾小蜂、竹笋禾夜蛾五种,其中黄脊竹蝗、竹异缕舟蛾、灰顶竹毒蛾危害严重,竹长尾小蜂、竹笋禾夜蛾存在潜在危害;需要政府加大扶持力度和建立科学的防治体系。 相似文献
5.
6.
7.
东至县位于长江中下游南岸,近年来全县发展毛竹林8275.8hm2,计249.3万株。毛竹虫害主要有3种:黄脊竹蝗、刚竹毒蛾和竹笋泉蝇。一、黄脊竹蝗又名竹蝗。大发生时,将竹叶吃尽,如同火烧一般,新竹被害即枯死,老竹被害后2~3年内不发新笋,被害竹的竹秆内往往积水,不能利用。 相似文献
8.
9.
10.
于黄脊竹蝗跳蝻上竹前的2龄跳蝻盛发期,用2%苏云金·氟虫腈悬浮剂6.7 mL/hm2兑水地面喷雾,结果表明该制剂对竹蝗的速效性好,持效期长,药后3 d的防效可达96.2%以上,且不伤害竹蝗的重要天敌红头芫菁. 相似文献
11.
分析了丽水地区森林病虫的发生现状是:①主要森林害虫马尾松毛虫发生严重;②一些次要害虫上升为主要害虫;③松材线虫病等检疫对象正威胁着丽水地区森林资源安全;④对森林病虫危害严重性认识不够、资金投入不足,提出了控制森林病虫为害的对策和措施。 相似文献
12.
13.
以吉林省落叶松人工林6种主要病虫害为监测对象,通过对21种动植物的物候变化观察,弄清了落叶松6种病虫害的发生期、为害期与物候现象的关系。在此基础上,制定了与落叶松病虫害发生、发育期相对应的物候现象对照表,提出了防治适期的参照性植物和预警植物。 相似文献
14.
John Vandermeer Ivette Perfecto Guillermo Ibarra Nuñez Stacy Phillpott Alvaro Garcia Ballinas 《Agroforestry Systems》2002,56(3):271-276
The role of Azteca sp. ants as potential biological control agents was studied in an organic coffee farm in Chiapas, Mexico. Individual larvae of Pieris rapae were placed on trees with artificially enhanced ant activity and both time to disappearance of the larvae and ant activity were recorded. There was a general negative relationship between time to disappearance and ant activity. A census of spiders was made of coffee bushes with and without foraging Azteca, encountering a negative relationship between ants and spiders. These results indicate that Azteca ants have potential as pests through their positive effect on scale insects, but also have potential as biological control agents, through their negative effect on potential herbivores. Furthermore, the correlation between ant and spider densities suggests a complicated relationship between these two predatory organisms, implying a more complicated food web structure than simply ants, homoptera and other herbivores.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
15.
人工林害虫的生态控制策略 总被引:1,自引:0,他引:1
森林害虫的科学管理必须考虑长远的经济效益和社会效益问题,只有对森林害虫进行生态控制才能达到森林可持续经营的目的。在人工林构建中,只有模拟天然林结构,从害虫栖息地抗虫林分结构出发,才能从根本上解决猖獗成灾问题。在对黑龙江省主要造林树种的天然抗虫结构、人工混交林和人工纯林的结构及害虫发生情况进行对比分析的基础上,提出了人工林害虫生态控制策略。 相似文献
16.
17.
18.
19.
防治桑树害虫,是为了保护桑树资源。桑树害虫是桑园生态系统中的亚系统。在桑园生态系统分析的基础上,建立桑园害虫管理模式,按照此模式进行害虫管理,可以提高保护现有桑树资源的水平。 相似文献
20.
Management Strategies and Research Orientations of Forest Diseases and Pests in China 总被引:1,自引:0,他引:1
ZHANG Xingyao LIANG Jun LU Quan YAN Donghui LUO Youqing XU Zhichun WEN Junbao. Research Institute of Forest Ecology. Environment Protection. Chinese Academy of Forestry. Beijing . P R China:. College of Biological Sciences Technology. Beiiine Forestry University. Beiiine. . P R China 《中国林业科技(英文版)》2002,(2)
Forest diseases and pests are perceived as a growing hazard to China economy. It is a common conclusion that the actualities of forest pests in china are no effective measures to the old important pests, some secondary pests are ascending to chief pests, increasing devastation from exotic pests, frequent ecological pest eruption induced by environmental detriment and host-leading diseases to threaten the "Western Development Project "in China, which is the most important economical strategy to China; that inducement of current forest pests results from ecological function loss and dangerous exoticpest intruding, On the basis of these cognitions, we suggest that strategies of management pests to natural forest would be stressed to maintain its innate capacities to adjust pests in virgin forest and resume such function in intermpted one, that to artificial forest would establish self-control in afforestated stands and develop resistant tree varieties and species, especially those in landscape trees. In re 相似文献