摘要:

AbstractResearch on killing of coniferous trees caused by the fungusRhizina undulataFr. ex Fr. in the Netherlands is reviewed. Aspects of the fungus’ pathogenicity, its biology and pyrophilous nature, and means to restrict or avoid damage in young plantations and older stands are discusse

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00283.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe detection of hidden F‐injury of forest trees by a simple colorimetric determination of peroxidase actívity. The paper describes a simple routine method for determining colorimetrically peroxidase activity (p. a.) in foliage of forest tree species, including conifers. The effect of factors such as foliage age, F Content, external F dust, necrosis etc. on p. a. is investigated. Analyses of plants exposed at different distances to F exhalates of an aluminum plant show that with decreasing distance F content and p. a. increase. P. a. thus is an indicator of air pollution effects on tree physiology even in the range where no visible symptoms of injury occ

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00284.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe resistance of several white poplar‐clones against Pollaccia radiosa. Continuing the work of Weisgerber(1967,1968 and 1969) clone‐typical forms of resistance against spring defoliation (shoot‐dieback), caused byPollaccia radiosawere investigated in several Leuce‐poplarclones. The most obvious differences in attack occur under natural conditions. The observed differences concerning the type of resistance (infection versus spreading in the host) seem to depend on the anatomical structure of t

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00285.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe effect of cuticular waxes on the infection rate of pathogenic fungi. 1. Lophodermium pinastri and Botrytis cinerea. Spore germination and growth rate of germ‐hyphae ofLophodermium pinastriandBotrytis cinereaare influenced by low concentrations of cuticular waxes, added to the germination medium. The stimulating effect increases with decreasing resistance of the species or race used for wax sampling. Generally the separately tested alcohol‐, aldehyde‐, ester‐, fatty acid‐ and hydrocarbon fractions induce similiar but less pronounced reactions than total waxes. Exceptions occur. They led to suggestions in direction to single chemical components causing resistance. – Finally alcohol and hydrocarbon chromatOgrams of cuticular waxes forPinus montana, P. nigraandPicea abiesare presented for the

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00286.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractEpidemiology of the needle‐cast fungus of pines (Lophodermium pinastri): results of four years studies with the aid of a Hirst spore trap. This study is dealing with the results of laboratory and forest (Haguenau) observations on the biology of the needle cast fungus of pines.The spores were harvested during a period of four years with a Hirstspore trap and their germination rate was studied.The results obtained permit to apply chemical treatments with a certainty of succes

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00287.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

Books reviwed in this article:Buhl, C., und SCHÜTTE, F.: Prognose wichtiger Pflanzenschädlinge in der Landwirtschaft.Schwerdtfeger, F.: Die Waldkrankheiten, ein Lehrbuch der Forstpathologie und des Forstschutzes.Ebing, W.: Gaschromatographie der Pflanzenschutzmitte

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1971.tb00288.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY