摘要:

AbstractThe presence ofMelampsora larici˜tremulaeKleb. andM. pinitorquaRostr. in the same area (Piz‐zorne, Lucca) was proved by studying differences between periods of teliospore germinability and by inoculations on pycnio‐aecial hosts.The life cycles and pathogcnicity of these two rusts were separately studied in a controlled environment and compared to those ofM. larici‐tremulaefrom Bressanone andM. pinitorquafrom Mont

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00911.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractComparative studies of type and herbarium specimens ofMarssoninaspecies pathogenic to poplars showed that recognition of four species viz.,M. populi, M. castagnei, M. balsamiferaeandM. brunneais warranted.M. tremutae, M. tremuloidisandM. populinawere considered to be synonymous withM. brunnea, which has priority. Morphological features of conidia (shape, mean dimensions, size ratios and septum location) proved useful differential taxonomic criteria.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00912.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractWe report on mass die‐back of young shoots ofPinus sylvestris inPoland as a consequence of infection withMelampsora pinitorquaandBotrytis cinere

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00913.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

ABSTRACTArmillaria mellea, A. ostoyaeandA. bulbosa, but notA. tabescens, infected some of the heavily suppressed oaks that had been inoculated, whereas onlyA. melleainfected subdominant oaks. The same three species also infected suppressed Scots pines, but onlyA. ostoyaeinfected subdominant ones. Infections in stump roots of oak inoculated withA. mellea, A. ostoyae, A. bulbosaandA. tabescenswere small unless roots had been weakened by severing; intact stump roots of pine were colonized more extensively than those of oak by the first three species.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00914.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractDilatation of thylakoids in mesophyll chloroplasts was found in needles from diseased Norway spruce. Additionally, the shape of the chloroplasts with extreme swellings of thylakoids had become spherical. These cytopathological symptoms are clearly distinct from structural changes observed in senescent needles from healthy trees.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00915.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractCyclaneusma minus on Pinus sylvestris needles in Poland.The occurrence of C.minuson living and dead needles was investigated in 140Pinus sylvestrisstands of Southern Poland. C.minuscould be found at all locations; it was less common in older stands than in younger ones. In young planta tions (up to the age of 20 years) the fungus caused heavy cast of (mostly two year old) needles.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00916.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractThe relative susceptibilities toSphaeropsis sapineaof sixPinusspp. cultivated in South Africa were investigated in growth chamber and field inoculations. The relative susceptibilities of the species tested, compare favourably with field observations by foresters over a number of years. There was some variation in pathogenicity amongS. sapineaisolates on the different species.

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00917.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractGrowth patterns of different Abies alba (Mill.) provenances after SO2‐fumigation during the previous winter. Height and diameter growth, time of flushing and needle cast were studied in differentAbies albaprovenances one year after SO2 exposure. Provenance specific reduction in growth and needle cast could be demonstrate

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00918.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractOne‐year‐old nursery‐grown trees of Populus deltoides X P. trichocarpa parentage exhibited stem necrosis and lesioning during the unusually moist 1985–1986 growing season. A yellow‐pigmented, Gram negative, aerobic, monotrichous bacterium which utilized salicin was isolated from infected tissue almost in pure culture. The bacterium was identified as Xanthomonas campestris pv. populi and pathogenicity tests revealed it to be the causal organism. This is the first recorded outbreak in New Zealand of stem necrosis of poplars caused by X. campestris pv. populi. The bacterium appears to be an opportunistic

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00919.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

AbstractThe effects of simulated summer night frost on actively growing Scots pine seedlings were studied in environmental plant growth chambers. Exposure to temperatures ranging from −4.5°C to −7.5°C caused ultrastructural alterations in the mesophyll cells of visually healthy cotyledons and primary needles of pine seed

ISSN:0300-1237    

DOI:10.1111/j.1439-0329.1988.tb00920.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY