摘要:

AbstractInEucalyptus regnansandE. obliquaa rapid increase in the spread of defects (discolouration and decay) was observed more than 14 years after wounding. This increase was due to a breakdown of the barrier zone and the subsequent spread of defects into wood formed after wounding. Satisfactory relationships predicting defect extent using time since wounding could not be derived.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01060.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractMicromorphological change of the epicuticular wax structure inPinus pineaneedles was analysed by scanning electron microscope and the relationships between the rates of wax weathering over seasons and the pollution‐climate at one urban and two rural sites arediscusse

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01061.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractIn spring, tubular wax structures were observed on the needle surfaces of new Norway spruce needles and also on previous‐year needles. In young plants, as in mature trees, the fusing and eroding of the wax tubes on needles of increasing age had taken place in relation to their exposure, particularly to wind and precipitation. The quantity of needle wax and certain fractions of the extracted wax differed in mature trees at two field sites and in young clonal plants. No difference in wax quantity and only small differences in wax composition occurred among young plants which had undergone different treatments (fumigation with O3, SO2, ambient air, filtered air, or planting at the sites). Environmental effects on wax structure, wax quantity and the presence of certain compounds in the wax were identifie

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01062.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractElm (Ulmussp.) shoots fromin vitromicropropagated plants were tested withOphiostoma ulmiculture filtrates, at different dilutions to determine the susceptibility of different host clones to Dutch elm disease (DED). ‘Commelin’, a susceptible Dutch hybrid, showed a high wilting index but that of American elm was higher. Although U.pumila × japonica(Sapporo gold 2) was the most tolerant to spore inoculation, its wilting index was as high as that of ‘Commelin’. The absorption capacity and wilting index of the elm shoots showed consistent correlation to isolate effectiveness (as determined by inoculation experiments), to production of toxin (cerato‐ulmin) and to filtrate dilution. This method could be used to assess the effectiveness of the different O.ulmiisolates and for the detection of elm genotypes that are highly susceptible to Dutch e

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01063.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractVegetative growth as a means of differentiatingOphiostoma piceaefromOphiostoma querci.Isolates ofOphiostoma piceaefrom spruce (Picea abies) and O.quercifrom oak (Quercus robur) showed distinct differences in vegetative growth of cultures at a wide range of temperatures.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01064.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Book reviewed in this article:The Polish Phytopathological Society (Ed.):Phytopathologia Polonica.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1994.tb01065.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY