EPIDEMIOLOGY AND CONTROL OF FUSARIUM DISEASE OF CARNATIONS IN VICTORIA
Diseases caused by Fusarium species cause major losses to carnation production in Victoria. Preliminary work indicated that the most important of these were F. oxysporum, F. graminearum and F. avenaceum. In 1990 a monthly survey was conducted at two Victorian farms to observe the incidence of Fusarium species in the tissue of symptomless carnation cuttings. Approximately the same number of cuttings were sampled from each site, at Farm A 333 isolations of Fusaria were made, of which 198 (60%) were of pathogenic species (F. oxysporum, F. graminearum or F. avenaceum): at Farm B 102 isolations were made of which 23 (20%) were of the pathogenic species. At Farm A the majority of isolations occurred during the first six months of the survey; F. avenacceum isolations increased from 2 in March to 49 in June and F. graminearum isolations from none in February to 8 in June. Implementation of a farm hygiene plan during the last six months of the survey reduced total isolations per month to below 20. At Farm B few isolations were made of pathogenic spècies. The majority of isolations were of one species, F. acuminatum, non-pathogenic to carnations. At both farms inoculum could be found of the pathogenic species on mature plants. The spread of this inoculum appears to be better controlled at Farm B than Farm A. This can be attributed to the better approach to Farm Management practices, i.e. hygiene, at Farm B.
Say, M., Kalc Wright, G. and Wimalajeewa, S. (1992). EPIDEMIOLOGY AND CONTROL OF FUSARIUM DISEASE OF CARNATIONS IN VICTORIA. Acta Hortic. 307, 89-94