ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00405.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractElectron microscope observations ofCeratocystis ulmi‐induced tylosis development in 3 species of elm were made during the first 2 weeks after artificial inoculation. Tylosis forming from both ray and vasicentric parenchyma occluded vessels adjacent to those containing the fungus conidia within one day after inoculation. The expanding protoplast forced the intact vessel‐parenchyma “pit membrane” and protective layer through the pit into the vessel lumen. Cell organization during this expansion is discussed. The observations on tylosis development for the 3 elms used were id

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00406.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractPeroxidase activity (p. a.) of several tree species was investigated in a forest influenced by F‐containing exhalates of an aluminium smelter. P. a. increases with age of tissue, particularly under the influence of fluorides. It was used therefore to map the zone of plant reaction in apricot orchards in the vicinity of an aluminium smelter and it supplements foliar analysis.P. a. in foliage of white ash was used to determine whether exhaust of automotive traffic in the city of Zurich does affect vegetation. A significant increase of p. a. was found in the city although the plants did not show any symptoms of injury.P. a. thus is a very sensitive indicator of plant reaction to air pollutants and allows to detect “hidden” injury (no visible symp

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00407.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractArmillaria root rot induces a reduction in the concentrations of N, P, K, Mg and Na; an increase in the levels of Ca, Mn, Fe and Zn; and a decrease in the annual height growth of the diseased trees of four coniferous species. The data indicates that these changes are caused by interferences in the metabolism of the infected host.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00408.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00409.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

AbstractSeveral methods were utilized to determine the disease incidence ofFomes annosus(Fr.) Karst. in selected 0.02 hectare plots established in five thinned loblolly pine (Pinus taedaL.) plantations. A total of 79 trees were sampled. Infection as determined by the presence of conks was 2.5 percent. Increment borer samples (two/tree) removed from the root collar zone revealed 10.1 percent infection. Root chip isolations from two, 45 cm long roots per tree indicated 31.6 percent infection. In a random sampling of 10 trees in each of the five plantations, 18 percent infection was found using the two root method. These results indicate thatF. annosusmay be more prevalent than previously reported.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00410.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00411.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00412.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00413.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1974.tb00414.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY