摘要:

AbstractPhellinus tremulaewas inoculated onPopulus tremula. It spread in the sapwood and inner wood of a living tree without other organisms being present. Plating experiments with wood meal from different parts of a sound tree showed that there were very few, if any, propagules of micro organisms in the sound wood, neither were there any organisms found in front of the decay ofP. tremulaeat the top of the decay column. These results support the theory thatP. tremulaeis a primary parasite in aspen.Decay fungi grown on fresh and autoclaved wood of aspen had very different growth rates. Most of the fungi tested grew best on autoclaved sapvvood. The difference in growth rate on fresh and autoclaved heartwood was lcss significant, suggesting that there is a barrier in the living wood which is destroyed by autoclaving.P. tremulaewas thc only fungus that grew best on fresh inner wood.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00544.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractA simple method for SO2fumigation of Norway spruce grafts in the laboratory.To investigate the resistance mechanism of Norway spruce to SO2a simple fumigation chamber was used. The conditions of fumigation gave the desired range of symptom expression.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00545.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe effect of fatty acids in stimulating production of perithecia of Ceratocystis ips, C. minor and C. capillifera.Perithecia formation of three species ofCeratocystisis stimulated by somo unsaturated fatty acids, spccially linoleic acid, and one saturated fatty acid (arachidic acid).

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00546.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractInfection of roots of spruce (Picea abies Karst.) by Fomes annosus present in the soil. 108 roots of spruce were severed at approximately 50 cm from the base of the tree. The resulting wounds were invaded byFomes annosusoriginating as mycelium or basidiospores in the soil. Infection rate on limestone soils was 41 %, on other soils 10 %.Odontia bicoloralso grew into spruce roots from the soil.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00547.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractStudies on the influence of nutrition on the susceptibility of plants to SO2. The mineral nutrition of plants is of great importance for their susceptibility to air pollutants. Substrate media with ammonia as nitrogen source, deficiency of potassium and low pH‐values reduce the buffer capacity and the cation contents. Buffer capacity and cation contents play important roles for the detoxification of SO2‐borne products. Low cation contents and a reduced buffer capacity produce a severe increase of the SO2‐effects. Decreased sulfur nutrition results in a considerable delay of the beginning of the SO2‐i

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00548.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe effect on spore germmation and germ tube growth ofDiplodia pineaproduced by (+)‐ α‐pinene, (−)‐β‐pinene, (+)‐Δ3‐carene, (−)‐limonene, β‐phellandrene, and terpinolene was determined over a range of vapour concentrations. Spore germination was most inhibited by A3‐carene; germ tube growth was inhibited by all these monoterpenes except (−)‐limonenc and ß‐phellandrene. In contrast to the low toxicity of (−)‐limonene, (+)‐limonene (not known to be present inPinus radiatacortical oleoresin) was extremely toxic to both spore germination and germ tube growth. The results arc discussed in rotation to an earlier observation that trees free of dieback in the field h

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00549.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractStudies on the physiology and parasitism of Lachnellula flavovirens (Bres.) Dennis. From laboratory and field studiesL. flavovirenswas identified as a facultative parasite on several alpine conifer species (Pinus cembra, P. montana, Larix decidua). In the course of the work, factors affecting its development were investigated, especially with regard to temperature and nutrients.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00550.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractInfection byFomes annosnsleads to thc formation of dry zones in conifer wood. During an investigation of the mechanism of drying it was found that water was withdrawn from infected parts of logs into uninfected parts probably by the release of hydrostatic tension. The tcnsions which exist in standing trees appearcd to be maintained in logs and to cause movement of water when the sealed tradieid system became sufficiently damaged to allow entry of air.F. annosusapparently caused this typc of clamage by enzymatic lysis in the bordered pit. However the extcnsion of dry zones beyond infection seems to imply a futher mechanism involving living xylem cells.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00551.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00552.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

Books reviwed in this article:Perkow, W.:Wirksubstanzen der Pflanzenschutz‐ und Schädlingsbekämpfungsmittelvan derPlank, J. E.:Principles of Plant InfectionDer Wurzelschwamm (Fomes annosus) und die Rotfäule der Fichte.vanEmden, H. F.:Pest Control and its Ecology.Claussen, T.:Die Reaktionen der Pflanzen auf Wirkungen des photochemischen S

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1976.tb00553.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY