Endothia gyrosa associated with severe stem cankers on plantation grown Eucalyptus nitens in Tasmania, Australia

1999 ◽  
Vol 29 (3) ◽  
pp. 199-208 ◽  
Author(s):  
T. J. Wardlaw
Keyword(s):  
Eucalyptus Nitens ◽  
Stem Cankers

scholarly journals Pathogenicity of Fungi Associated with Stem Cankers of Eucalypts in Tasmania, Australia

Plant Disease ◽  
1999 ◽  
Vol 83 (11) ◽  
pp. 1063-1069 ◽  
Author(s):  
Z. Q. Yuan ◽  
C. Mohammed
Keyword(s):  
Stem Canker ◽  
Fungal Species ◽  
Plantation Forestry ◽  
Artificial Inoculation ◽  
Eucalyptus Nitens ◽  
Pathogenic Species ◽  
Potential Threat ◽  
Southeast Australia ◽  
Pestalotiopsis Neglecta ◽  
Stem Cankers

Thirteen stem-infecting fungal species, 11 from Tasmania and 2 from other parts of southeast Australia, were tested for their pathogenicity on 12-month-old seedlings of Eucalyptus nitens and E. globulus. They were classified into three groups based on their ability to cause stem canker lesions following artificial inoculation: pathogenic species (Phoma sp., Endothia gyrosa, and Seiridium eucalypti), intermediate or weakly pathogenic species (Botryosphaeria sp., Seiridium papillatum, Pestalotiopsis neglecta, Zythiostroma sp., Ceuthospora innumera, Cytospora eucalypticola, and Wuestneia epispora), and nonpathogenic species (Dinemasporium strigosum, Seiridium unicorne, and Harknessia aff. eucalypti). The potential threat of canker fungi, especially Endothia gyrosa, to plantation forestry in Australia is discussed.

scholarly journals First Report of Colletotrichum truncatum Causing Stem Cankers on Jatropha curcas in Burkina Faso

Plant Disease ◽  
2015 ◽  
Vol 99 (1) ◽  
pp. 14-20 ◽  
Author(s):  
C. A. Ellison ◽  
A. Sawadogo ◽  
S. Braman ◽  
S. Nacro
Keyword(s):  
Burkina Faso ◽  
Jatropha Curcas ◽  
Management Practices ◽  
Fruit Production ◽  
Multiple Infections ◽  
Colletotrichum Truncatum ◽  
Yield Losses ◽  
Disease Symptoms ◽  
Stem Lesions ◽  
Stem Cankers

A new disease was identified on the biofuel crop Jatropha curcas in 2012 in Burkina Faso that is causing serious yield losses. The disease was found to be widespread in both Sissili and Comoé Provinces. It causes characteristic leaf lesions, fruit necrosis, and cankers on young stems and branches. There was evidence of multiple infections on plants over the growing season, with regrowth evident from below old cankers, but there was little fruit production from infected branches. A detailed monitoring and assessment was undertaken of the disease progress in a severely infected field, over a 7-week period. The disease symptoms progressed from chlorosis through a necrotic phase and, in approximately 83% of replicates, stem cankers developed that resulted in dieback and lodging of branches. Colletotrichum truncatum and a member of the species complex C. gloeosporioides sensu lato were consistently isolated from fresh stem samples showing early symptoms (chlorosis). Koch's postulates were undertaken, to establish the pathogenicity of the two species. No symptoms were observed on plants inoculated with C. gloeosporioides; however, leaf and stem lesions developed after inoculation with C. truncatum, which was reisolated from the diseased tissue, confirming it as the disease-causing agent. Preliminary management practices for the disease are proposed.

scholarly journals Efecto del raleo en el crecimiento y algunas propiedades de la madera de Eucalyptus nitens en una plantación de 15 años

2012 ◽  
pp. 0-0 ◽  
Author(s):  
Sandro Díaz Bravo ◽  
Miguel Espinosa ◽  
Luis Valenzuela ◽  
Jorge Cancino ◽  
Jean P Lasserre
Keyword(s):  
Eucalyptus Nitens

Dinucleotide microsatellites from Eucalyptus sieberi: inheritance, diversity, and improved scoring of single-base differences

Genome ◽  
2001 ◽  
Vol 44 (6) ◽  
pp. 1041-1045 ◽  
Author(s):  
J C Glaubitz ◽  
L C Emebiri ◽  
G F Moran
Keyword(s):  
Base Pair ◽  
Mendelian Inheritance ◽  
Null Alleles ◽  
Fixation Index ◽  
Eucalyptus Nitens ◽  
Internal Reference ◽  
Single Base ◽  
Hardy Weinberg Equilibrium ◽  
Single Base Pair ◽  
Flanking Regions

Eight dinucleotide microsatellites were developed in Eucalyptus sieberi L. Johnson (silvertop ash), a member of the subgenus Eucalyptus. Transfer of six of these to the subgenus Symphyomyrtus and their Mendelian inheritance are demonstrated using a full-sib cross in Eucalyptus nitens. Genetic diversity parameters are presented for the eight loci based on a sample of 100 old-growth E. sieberi trees from a single natural stand. One locus, Es266, had an atypically high fixation index, and significantly deviated from Hardy-Weinberg equilibrium genotypic proportions, indicating the likely presence of null alleles. Two of the loci, Es076 and Es140, had many alleles that differed in size by only a single base pair, possibly because of short poly(A) or poly(T) stretches in their flanking regions. These two loci were by far the most polymorphic, but were difficult to score reliably on a capillary DNA sequencer. Reliability of scoring of these two one-base microsatellite loci was markedly improved by the incorporation of internal reference alleles into each sample analysed.Key words: SSRs, single base pair alleles, null alleles, internal reference alleles.

scholarly journals Initial defence responses in sapwood of Eucalyptus nitens(Maiden) following wounding and fungal inoculation

2001 ◽  
Vol 58 (2) ◽  
pp. 63-72 ◽  
Author(s):  
K.M. Barry ◽  
R.B. Pearce ◽  
S.D. Evans ◽  
L.D. Hall ◽  
C.M. Mohammed
Keyword(s):  
Eucalyptus Nitens ◽  
Defence Responses ◽  
Fungal Inoculation

scholarly journals Soil Inoculum Production, Survival, and Infectivity of the Boxwood Blight Pathogen, Calonectria pseudonaviculata

Plant Disease ◽  
2015 ◽  
Vol 99 (12) ◽  
pp. 1689-1694 ◽  
Author(s):  
Norm Dart ◽  
Chuanxue Hong ◽  
Caryn Allen Craig ◽  
J. T. Fry ◽  
Xinran Hu
Keyword(s):  
Root Rot ◽  
Soil Inoculum ◽  
Foliar Blight ◽  
High Inoculum ◽  
Inoculum Production ◽  
Foliar Pathogen ◽  
Leaves And Roots ◽  
Crown And Root Rot ◽  
Stem Cankers

Boxwood blight caused by Calonectria pseudonaviculata is typically expressed as a foliage disease with aboveground symptoms including defoliation, dieback and formation of dark narrow stem cankers. Whether this pathogen behaves like other Calonectria spp. and has a significant soil phase in the epidemiology of boxwood blight is not known. In this study we observed experimentally that (1) the boxwood blight pathogen consistently forms microsclerotia in artificially inoculated leaves and roots of Buxus spp., (2) soil artificially inoculated with conidia and microsclerotia of this pathogen can cause foliar blight, (3) conidia and microsclerotia can remain viable in soil for up to 3 and at least 40 weeks, respectively (4) and the pathogen can cause crown and root rot to plants only when roots and crowns are directly exposed to relatively high inoculum levels. Our results suggest that C. pseudonaviculata is primarily a foliar pathogen with a potentially epidemiologically significant soil phase.

Sign in / Sign up

Export Citation Format

Share Document