Effect of drought and defoliation on the susceptibility of eucalypts to cankers caused by Endothia gyrosa and Botryosphaeria ribis

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Australian Journal of Botany; (Australia)

DOI:https://doi.org/10.1071/BT9900571· OSTI ID:6003214

Old, K M; Gibbs, R; Craig, I; Myers, B J ^[1]; Yuan, Z Q ^[2]

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1. CSIRO, Canberra (Australia)
2. Xinjiang August 1st Agricultural College (China)

Seedlings, saplings and mature eucalypts were susceptible to infection by Endothia gyrosa and Botryosphaeria ribis. Eucalyptus regnans and E. delegatensis were more susceptible than E. grandis and E. saligna. In trees not subjected to stress, cankers were limited in extent and often healed. When trees were defoliated, either manually or by severe insect attack, stem concentrations of both starch and soluble carbohydrates were reduced and canker development in some pathogen/host combinations was increased. Seedlings subjected to water stress were not predisposed to canker formation. The association of E. gyrosa with branch dieback of rural eucalypts suffering from chronic defoliation suggests that canker fungi contribute to the crown dieback syndrome in south-eastern Australia.

• OSTI ID: 6003214
• Journal Information: Australian Journal of Botany; (Australia), Vol. 38:6; ISSN 0067-1924
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
DROUGHTS
BIOLOGICAL EFFECTS
EUCALYPTUSES
PLANT DISEASES
AUSTRALIA
FUNGI
INFECTIVITY
LEAVES
SEEDLINGS
SENSITIVITY
AUSTRALASIA
MAGNOLIOPHYTA
MAGNOLIOPSIDA
PLANTS
TREES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
540210 - Environment
Terrestrial- Basic Studies- (1990-)