New Zealand Journal of Crop and Horticultural Science abstracts
Differential sensitivity of citrus green mould isolates (Penicillium
digitatum Sacc.) to the fungicide imazalil
BRIAN L. WILD
Postharvest Group
New South Wales Agriculture
P.O. Box 581
Gosford, NSW 2250
Australia
Abstract Penicillium digitatum Sacc. isolates, obtained
from Australian citrus fruit and from oranges and lemons imported from the
United States were compared for their sensitivity to the fungicide imazalil. In
vitro data showed the four strains from the United States were up to 13 times
less sensitive than the four strains from Australia. A similar response was
found in in vivo experiments with resistant strains more difficult to control
than sensitive ones. The standard application of imazalil in water, as
practised in Australia however still provided reasonable decay protection. A
growth media concentration of 0.1 ug/ml imazalil was established as a suitable
concentration for differentiating imazalil resistant strains. All strains from
the United States that were tested were also resistant to the benzimidazole
fungicides and were therefore classified as being double resistant to these two
different groups of compounds. Two of the Australian strains were also
resistant to the benzimidazoles. All were controllable with the standard
application of the fungicide guazatine.
Keywords Fungaflor; Benlate; Panoctine; imazalil; tolerance;
Penicillium digitatum; citrus green mould
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