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First report of Cryptosphaeria pullmanensis as causal agent of Cryptosphaeria canker of Populus nigra in Iran 下载免费PDF全文
A diatrypaceous fungus was isolated consistently from cankers on Populus nigra trees showing dieback symptoms in Kohgiluyeh Boyer‐Ahmad, Zanjan and Esfahan provinces in Iran. Morphological characteristics and phylogenetic analyses of the ITS region of the rDNA identified the taxon as Cryptosphaeria pullmanensis. Pathogenicity tests conducted in potted 3‐month‐old cuttings of P. nigra confirmed Koch's postulates and revealed that C. pullmanensis caused canker on this host. This is the first report of C. pullmanensis causing a canker disease on P. nigra in Iran. 相似文献
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利用样地调查方法,对长春市街路与广场的树木结构进行分析,结果表明:街路与广场共有杨柳树172617株,杨树的平均胸径为19.8cm,平均树高8.5m;柳树的平均胸径为20.0cm,平均树高7.5m。杨柳树的总生物量为83805.5t,总叶面积为14851196.9m^2。杨柳树每年可以制造干物质4629.2t,吸收二氧化碳6786.6t,放出氧气4939.4t,吸滞灰尘5755.4t,吸收二氧化硫44.1t。 相似文献
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The technique of random amplified polymorphic DNA (RAPD) fingerprinting was used to differentiate species and identify clones of 15 poplar and 15 willow clones (ramets of three poplar clones were also included to verify the stability of the results). Four random DNA primers (Deca-11, Chl-1, Chl-4 and Chl-10) and an M13 universal primer were used to determine DNA polymorphism among the clones. Based on the DNA banding pattern obtained with the four DNA primers by polymerase chain reaction (PCR) amplification we conclude that RAPD fingerprinting with properly selected primers can be used for clonal and species differentiation of poplar and willow. The technique is simple, accurate and inexpensive. 相似文献
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R. G. Strouts 《Forest Pathology》1973,3(1):13-24
Coryneum canker occurs widely on Cupressus macrocarpa in England. Mycelial inoculations caused perennial cankers on Cupressocyparis leylandii and Chamaecyparis nootkatensis, severe but annual cankers on Thuja plicata and death of twigs on Juniperus communis. Chamaecy-paris lawsoniana rapidly overcame initial infection. Conidial inoculations on C. leylandii caused cankers. The potential of the disease in Britain and its control are discussed and aids to the identification of the fungus in culture given. 相似文献
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Identification and characterization of fungi associated with internal wood lesions and decline disease of willow and poplar trees in Iran 下载免费PDF全文
During the study of fungal trunk pathogens associated with urban trees decline in Shiraz (Iran), a serious decline of willow and poplar trees was observed. Therefore, an investigation was conducted on these trees in some areas of this city during spring and summer 2012 and 2013, to determine the main fungal trunk pathogens associated with these ornamental plants. Plant materials were collected from trees exhibiting disease symptoms such as yellowing, shoot canker, shoot dieback, defoliation and internal wood necrosis and decayed wood. Fungal isolations were made from discoloured or decayed wood tissue onto 2% malt extract agar (MEA) amended with streptomycin sulphate. Nine species, Fomes fomentarius, Diplodia seriata, Lasiodiplodia theobromae, Dothiorella sarmentorum, Neoscytalidium hyalinum, Diatrype whitmanensis, Phaeoacremonium rubrigenum, P. aleophilum and P. parasiticum, were identified based on morphology and DNA sequence comparisons. Pathogenicity tests were performed on detached shoots of willow and poplar trees under greenhouse conditions. Lasiodiplodia theobromae caused the longest lesions on willow. On poplar shoots, the longest lesions were caused by P. parasiticum. Diplodia seriata produced the smallest lesions on both woody hosts. First reports from willow wood include P. parasiticum, P. rubrigenum, D. whitmanensis, L. theobromae, D. seriata and N. hyalinum, while new reports from poplar wood include P. parasiticum and Do. sarmentorum. Based on our knowledge, this is also the first report of D. whitmanensis in Iran. 相似文献
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New Zealand is subject to summer and autumn droughts that limit pasture growth. The planting of willow and poplar trees is
one option used to provide green fodder during drought. However, there is a wide concern that such an option can reduce the
overall understorey pasture growth. This study evaluated the comparative establishment and growth of densely planted young
willow and poplar and their effects on understorey pasture growth. Two experiments were established for 2 years in Palmerston
North and Masterton, North Island, New Zealand. In the first experiment, densely planted willow and poplar significantly reduced
understorey pasture growth by 24 and 9%, respectively, mainly due to shade, but coupled with soil moisture deficit in summer.
In the second experiment, pasture growth in a willow browse block was 52% of that in open pasture as a result of shade and
differences in pasture species composition and management. Willow and poplar survival rates were similar (P > 0.05) after 2 years of establishment (100 vs. 90.5%, respectively). However, willow grew faster than poplar in height (1.90
vs. 1.35 m), stem diameter (43.5 vs. 32.6 mm), canopy diameter (69 vs. 34 cm) and number of shoots (8.7 vs. 2.3) at the age
of 2 years. 相似文献
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杨树黑斑病测报模型的研究 总被引:1,自引:0,他引:1
在北京郊区黑杨林地内设置固定样地,进行杨树黑斑病Marssonina brunnea病原菌孢子捕捉和病情调查。运用数量化理论I系统分析了病情指数与气象因子之间的关系,结果表明:当平均气温20~28℃、平均相对湿度80%以上、降雨量为60 mm以上时,杨树黑斑病的病情发展迅速。同时建立了杨树黑斑病的数量化测报模型:^yi=-5.236 1x(1,1)+7.388 4x(1,2)-3.045 7x(1,3)-6.231 5x(2,1)-4.540 9x(2,2)+6.261 8x(2,3)+20.496 3x(2,4)+1.146 6x(3,1)+3.613 4x(3,2)+7.025 7x(3,3)+19.680 2x(3,4)。对测报模型检验的预测精度在88.49%~96.43%之间。 相似文献
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Cankers and dieback on London plane caused by Diaporthe scabra have been observed in urban plantings in Catania, Italy. Symptoms were delayed spring flush, trunk cankers, small chlorotic leaves associated with dead terminal or lateral branches and an early defoliation. Isolations from infected wood on PDA led to the isolation of the anamorph Phomopsis scabra with α‐conidia production. The infected wood placed in a moist chamber developed pycnidia with α and β conidia and perithecia of the teleomorph D. scabra. Sequence analysis of the internal transcribed spacers ITS1 and ITS2, the ribosomal intragenic spacer beta‐tubulin 1 and beta‐tubulin 2 genes, congruently indicated that the D. scabra isolate is phylogenetically related to two strains of D. helianthi isolated in Italy from sunflower and to strains of D. eres. Inoculations on young plants of London plane growing in pots confirmed the pathogenicity of the isolated fungus. To our knowledge, this is the first report of the disease in Italy. 相似文献
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Xylem vulnerability to cavitation varies among poplar and willow clones and correlates with yield 总被引:1,自引:0,他引:1
Xylem vulnerability to cavitation is a promising criterion for identifying trees with high drought tolerance, but traditional techniques for measuring cavitation resistance are unsuitable for screening large numbers of genotypes. We tested the potential of the new Cavitron technique for high throughput screening of cavitation resistance in five poplar (Populus spp.) and four willow (Salix spp.) clones. The Cavitron technique enabled the screening of three to four clones per day with sufficient accuracy to reveal significant differences between clones. Because intraspecific screening may be better carried out through the identification of correlated and more easily measured traits, we attempted to identify accessible parameters that correlate to cavitation resistance. Variability in vulnerability to cavitation across clones was poorly correlated with anatomical traits such as vessel diameter, vessel wall strength, wood density and fiber wall thickness; however, a striking correlation was established between cavitation resistance and aboveground biomass production, indicating a possible trade-off between xylem safety and growth potential. 相似文献
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Krystyna Przybyl 《Forest Pathology》1984,14(3):183-191
Structural changes in cells affected by the fungus C. fimbriata, involving the cell wall, cytoplasm and plastids were investigated. In the necrotic tissues a high number of fat drops was observed. The progress of hyphae of the fungus in poplar clones differing in their resistance depended on the presence of a cork layer, tannins and starch content. 相似文献
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海滨湿地杨树、柳树新无性系苗期耐盐性研究 总被引:3,自引:0,他引:3
在海滨湿地分别4个盐度梯度,12种杨树、柳树新无性系田间扦插试验结果表明:在苗期,不同杨树、柳树无性系的成活率、保存率、生长量等均与土壤含盐量呈负相关;在出苗期的耐盐能力,1-74杨、1-69杨可达0.241%,35杨为0.188%,J30-16、J35-13、J4-34、J31-17柳为0.089%,其余5个柳树无性系均在0.060%以下;在苗木生长期,其耐盐极限分别为0.343%,0.333%和0.201%。 相似文献
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Qian Wang Yuanze Shi Junnan Yu Lulu Shan Deying Sun Shuqing Yang Xiaofei Chen 《Forest Pathology》2023,53(3):e12815
Styphnolobium japonicum (L.) Schott is a deciduous tree belonging to family Fabaceae and has been widely planted as garden greenery in China. In May 2021, a serious branch canker disease was observed in Alaer City. In order to identify the pathogen, five fungi were isolated from the diseased branches and the pathogenicity was evaluated by inoculating the branches outdoors. The pathogen was re-isolated from all the inoculated branches, therefore fulfilling Koch's postulates. Based on the morphological characteristic and polygenetic analysis using the internal transcribed spacer region, β-tubulin and the translation elongation factor 1-alpha, the pathogen was identified as Fusarium solani. This is the first report of F. solani as the causal agent of a branch canker of S. japonicum in Xinjiang of China. 相似文献
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Rongbo Wang Shuzhun Chen Bowen Zheng Peiqing Liu Benjin Li Qiyong Weng Qinghe Chen 《Forest Pathology》2019,49(5)
Taxus chinensis is a valuable tree with uses for timber, medicinal, ornamental and landscape purposes. Most importantly, it is a source of the anti‐cancer drug paclitaxel. In 2016, needle spot disease was observed on T. chinensis in Fujian Province of China. Five isolates of similar morphology were isolated from diseased samples. The pathogen was identified as Neopestalotiopsis clavispora based on morphological and cultural characteristics and confirmed by sequence analysis of the internal transcribed spacer region (ITS) and the large subunit ribosomal RNA gene (LSU). The pathogenicity of the isolates was confirmed by fulfilling Koch's postulates. To the best of our knowledge, this is the first report to indicate that the causal agent of needle spot disease on Chinese yew in China is N. clavispora. 相似文献
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Introduction9Withtherapidlydevelopingofartificialpoplarforests,poplardiseasesincreasedgradually.Specially,poplarlonghornedbeetlesandcankerhavebecomethemainharmfulfactorsofaffectingthedevelopmentofpoplarstands.Therefore,thecontroltacticsforpoplarDothiorellacankerandCytosporacankerhavebeenlistedforkeyprojectinSeventhFive-YearPlan,EighthFive-YearplanandNinthFive-YearplanofChinasincethemiddleof80s.InTwentiethInternationalPoplarConference,"IntegratedcontroltechniqueofpoplardiseaseinChina"as… 相似文献