New Zealand Journal of Crop and Horticultural Science abstracts
A stem canker disease of olive (Olea europaea) in New Zealand
R. K. TAYLOR
C. N. HALE+
W. F. T. HARTILL
The Horticulture and Food Research
Institute of New Zealand Ltd
Private Bag 92 169
Auckland, New Zealand
email: chale@hortresearch.co.nz
Abstract A disease complex, with symptoms that include stem
cankers and tip die-back, is reported in New Zealand olives (
Olea
europaea L.). Bacteria from stem cankers of olive were consistently
isolated as pale lemon-yellow colonies on King's medium B. On the basis of
microbiological, molecular, and pathogenicity tests the bacterium isolated was
identified as
Xanthomonas sp. The bacterial isolates allowed
verification of Koch's postulates on young olive trees. As a result of our
findings we suggest that the stem canker on olive is caused by
Xanthomonas
sp. In addition a fungus identified as
Fusicoccum luteum was
consistently isolated from stem cankers and tip die-back. In inoculated plants
F.
luteum occasionally formed cankerous symptoms though not as
aggressively as
Xanthomonas sp. At this stage it is not clear what role
F. luteum has in primary infection.
Keywords olive; stem canker; tip die-back; Xanthomonas
sp; Fusicoccum luteum
+Corresponding author.
H01013
Received 5 April 2001; accepted 9 July 2001
New Zealand Journal of Crop and Horticultural Science, 2001, Vol. 29:
219-228
0014-0671/01/2903-0219 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (2031K); (scanned from paper original: notes about this process)
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