摘要:

AbstractThe biology of the pathogenic agent of plane tree canker (Ceratocystis fimbriataf.platani), the vectors of the disease and the results of some preventive and curative treatments are described in detail.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00112.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractEasily‐measured site variables (e. g. absolute elevation, exposure, slope and aspect) were used to prepare different regression models to predict the extent and severity of attack byC. sororiaon a number of different provenances of lodgepole pine. Using a simple climatic‐zone division of Scotland, a significant relationship between percentage infection on whorls 1–5, 6–10 and 11–15 and elevation, exposure and site aspect was demonstrated, whereas severity of infection was not well related with these variables in any of the models tested. This suggests that severity of infection may be influenced by other independent variables, e. g. persistence of liquid water on bark, success of spore germination and host resistance. This approach offers an opportuity to predict the possible susceptibility of different provenances of lodgepole pine under specific site c

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00113.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractSeveral conifer nurseries were visited in Piedmont (Italy) and soil and root‐samples were taken and examined for plant‐parasitic nematodes.In these investigations damage to the mycorrhizae caused by phytohelminths, most frequently through their trophic activity on the tissue of the host plant, has been obser

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00114.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractThe results of studies of various bacteria isolated from characteristic excrescences of the so‐called bacterial canker of common ash are reported. A fungus (formerly known asPlenodomus rabenhorstiiPreuss) associated with this disease, is described and renamed asPhoma riggenbachiiBoerema et Janse. Based on biochemical, serological and pathological work the namePseudomonas syringaesubsp.savastanoi(ex Smith) subsp. nov., nom. rev. pv.fraxiniis proposed for the ash bacterium. The closely related causal organisms of olive and oleander have been compared and named pv.oleaeand pv.neri

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00115.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractMelampsora medusaeThuem. is a hazard to cultivation and fiber production of hybrid poplars grown under short rotations, particularly when the alternate host is present. This rust can be controlled with biweekly fungicide applications but resistant clones are the best method of control.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1981.tb00116.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY