摘要:

AbstractAscocorynespp. occurred only in heartwood,Neobulgaria premnophilaalso in sapwood, both with an upward, decreasing frequency in the lower 2–5 m of the stems.Nectria fuckelianaoccurred at all heights, most abundantly in the 2–5 m above stump level and only in heartwood. Several other fungi also occurred, but less frequen

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00063.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractScanning electron microscopy was used to aid the study of the physical relationships between n+n stage ofCronartium ribicolaand its alternate host,Ribes hudsonianumvar.petiolare, and to examine the morphology of certain fungus structures. Germ tubes penetratedRibesleaves through stomates exclusively. Formation of appressoria over stomates were also observed. Intercellular leaf spaces were more than adequate to accommodate the intercellular mycelium. The intercellular hyphae and germ tubes were attached to adjacent host cell surfaces. Haustoria were found to be consistently saccate and shown to characterize the n+n stage ofC. ribicola.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00064.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractTechniques of plant disease assessment appropriate For measuring forest tree diseases are considered taking cognizance of the heterogenous and structural complexities of the forest. Strategies proposed for disease management in forest reserves and plantations of developing countries are as follows: direct assay of plant pathogens on sites for plantation establishment, aerial surveys of large and extensive plantations in combination with ground sample surveys and disease predictions using climate and biological data.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00065.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractXanthomonas populisubsp.populi, the cause of bacterial canker in poplar and X.populisubsp.salicis, causing bacterial canker in willow can be distinguished in vitro by their metabolic pattern, NaCl‐tolerance and motilit

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00066.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractMLO in spiked sandal, spikedZizyphus, Dodonaeaand other hosts are closely related enough to be called strains; field evidence suggests adaptation of the organism before infecting each other while serological evidence indicates close similarities. Associated hosts are therefore important in the control of spike disease in sandal due to the transmission of disease from diseased associated hosts to sandal within a period of time. Spike disease which was confined to sandal forests of Karnataka and Tamil Nadu has now spread to Kerala State lor the first time in 1980.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00067.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractFusicoccum quercus Oudem., the cause of a bark dieback, and other bark fungi from oak. A survey of pathogenic and non‐pathogenic fungi on the bark of young oak includesF. quercusfor which the symptoms and epidemiology are described in detail andAmphiporthe leiphaemia, Phomopsis quercella, Pezicula cinnamomea, Hercospora taleola, Colpoma quercinumandBotrytis cinere

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00068.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractA review is given on current research onFames annosusandArmillaria melleain conifer stands in Russia. Investigations are proceeding on a wide front, involving stump treatments, rhizosphere effects and allelopathic effects of various species. Some representative figures for losses are given.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00069.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractThe process of compartmentalization, including the formation of barrier zones, localized discolored and decayed wood in roots of balsam fir, red spruce, eastern hemlock, white pine, and tamarack. The decay was caused byArmillaria mellea(Vahl. ex Fr.) Quel. and unidentified hymenomycetes. The most effective “walls” to decay were composed of resin ducts and parenchyma cells. Cylindrical patterns of decay formed due to tangential bands of resin ducts and parenchyma. In response to injury, conifer roots increase production of parenchyma cells which accumulate polyhenols. Three types of parenchyma may be produced: that associated with resin ducts, xylem rays, and tangential rings of cells resembling marginal parench

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00070.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractRegeneration of thin roots of spruce (Picea abies Karst.) and invasion of them by fungi present in the soil. 266 roots of spruce were severed 35–150 cm from the base of the tree; the diameter of the roots at the cut ends was 0.3–3 cm. Either replacement roots were formed and hyphae mainly ofAscomyceteswere found in the original roots only near the cut ends or no new roots were formed and the ascomycetous hyphae had invaded Further. Formation of replacement roots was lower on calcareous soils. At and before the Front of the hyphae a brown substance occurred in the tracheids.Odontia bicolorhad invaded the roots of a few trees on the calcareous soil,Fomes annosuswas found in only one thin root. ‐ Roots with a diameter larger than 3 cm at the cut ends were invaded byFomes annosus, and no new roots were f

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00071.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractThe growth ofFomes annosusin liquid medium was inhibited by phenols which were oxidized by the fungus and/or induced high laccase acitivity. The effect of some of the tested phenols was different when they were applied to wood.The applicability of hydroquinone in spruce‐stems as protecting agent against invasion ofFomes annosusis discusse

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00072.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY