首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到10条相似文献,搜索用时 187 毫秒
1.
马尾松共生菌根真菌调查研究   总被引:9,自引:1,他引:8       下载免费PDF全文
通过野外调查和室内鉴定,已查明与马尾松共生的菌根真菌27个种,其中有19个种是国内首次报道的。编制了马尾松菌根真菌名录(一)。马尾松隶属外生菌根树种,它可与多种菌根真菌共生形成典型的外生菌根的结构。  相似文献   

2.
澳大利亚杂交松在广西引种试验研究   总被引:1,自引:0,他引:1  
澳大利亚杂交松(Pinus elliottii×Pinus caribaea)引种区域对比试验表明,杂交松能适应广西的自然条件,并表现出优良的速生丰产性状。杂交松的生长优于马尾松、湿地松和加勒比松,其平均公顷蓄积量分别比马尾松、湿地松和加勒比松大34.93%、82.44%和174.98%。杂交松年均树高和年均胸径生长量都超过了广西马尾松速丰林生长指标,适于在生产中推广。  相似文献   

3.
Summary Studies on the variability of galleries of pine bark beetles (Col., Ipidae) The variability of the galleries of bark beetles haven't been considered enough till now. Examples of anomalies are given and reduced to their causes. The great pine bast beetle,Myelophilus piniperda, builds the mother-gallery under the bark of stumps downwards instead of above. This can be fed back to the conditions of humidity in the stumps. The little pine bast beetle,Myelophilus minor, when attacking lying stems, often lays eggs only into the higher part of the gallery which is kept free from bore meal. Under the influence of different environment factors also other species of Hylesinini and Ipini show anomalies in building up their galleries.  相似文献   

4.
5.
Heavy loss of pine trees has been occurring for several decades throughout central to southwestern districts of Japan. In spite of beetles abundantly found under bark of dead trees, entomologists were inclined to the assumption that some other agents had already infected healthy trees before beetle attack based on various findings. It has been proved recently that the causative agent was the pine wood nematode (Bursaphelenchus lignicolus) newly discovered by pathologists and its transmitter was the Japanese pine sawyer (Monochamus alternatus). Aerial application of insecticides against the sawyer is now employed as a tentative measure of control.  相似文献   

6.
英德火炬松种子园子代在粤北的生长规律研究   总被引:1,自引:1,他引:0       下载免费PDF全文
火炬松(Pinus taeda L.)原产美国东南部,为美国东南部的主要造林树种,具有生长快、适应性强、材质好、抗病虫害强的特点,是美国南方松中分布最广、蓄积量最多的树种,也是工业原料林和薪炭林树种[1].  相似文献   

7.
Spread of Forest Pests and Pathogens in the Northern Hemisphere   总被引:2,自引:0,他引:2  
GIBBS  J. N.; WAINHOUSE  D. 《Forestry》1986,59(2):141-153
There are four main forest regions in the northern hemisphere,each containing many of the same genera of trees. An organism(insect, fungus etc.) living in balanced relationship with itshost tree in one of these forest regions may cause major damageif moved to another. Examples of pest and disease problems analysedinclude Chestnut blight, White pine blister rust, Gypsy moth,Balsam woolly aphid, Dutch elm disease, Pine wilt disease andBeech bark disease.  相似文献   

8.
To confirm the pathogenicity of a blue stain fungus,Ceratocystis piceae (Münch) Bakshi to the Japanese red pine (Pinus densiflora Sieb. et Zucc.), the responses of healthy young pine trees and stressed trees which were girdled by the half-circumferential girdling technique were investigated by the fungal inoculation test. Although neither of the pine trees inoculated withC. piceae in the non-girdled treatment nor the controls died, mortality of the trees girdled and inoculated withC. piceae was 28.6%. In the pine trees inoculated withC. piceae, the mean area of the necrotic lesion of the sapwood was significantly larger than that of the controls, and the mean of the water pressure potential of the xylem decreased, regardless of the girdling treatment. TheC. piceae was reisolated from the wood pieces near the inoculation points on the inoculated trees, but not from the controls. These results suggest that under strongly stressed conditions, the Japanese red pine trees might have been killed by heavy infestations ofC. piceae carried by bark beetles. A part of this paper was presented at the 103rd Annual Meeting of the Japanese Forestry Society (1992).  相似文献   

9.
孙静 《绿色科技》2019,(17):231-233
指出了日本松干蚧是我国重要的林业枝梢害虫,其发生密度大、防治难,对林业生态安全造成严重的影响。详细描述了其外部形态和生物学特性,初步分析了该虫发生特点,提出了相应的治理对策。  相似文献   

10.
抗松材线虫病马尾松无性系种子园营建技术   总被引:1,自引:0,他引:1  
松材线虫病是危害松属树种的毁灭性病害,危害严重、防治困难。安徽省从2001年开始从疫区和非疫区的马尾松林分中选择324株抗病优树以及部分广东、广西种源,通过嫁接繁殖和人工接种松材线虫的方法进行无性系抗病性测定。2011年利用筛选出的68个家系的89个高抗无性系营建了1.6 hm2抗松材线虫病马尾松无性系种子园。各家系成活率90.9%~100%,平均成活率93.6%。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号