New Zealand Journal of Crop and Horticultural Science abstracts
Fungicide resistance in populations of cucurbit powdery mildew (Sphaerotheca
fuliginea)
R. G. O'BRIEN
Plant Protection Unit
Department of Primary Industries
80 Meiers Road
Indooroopilly, Qld 4068
Australia
Abstract Cucurbit powdery mildew samples from Australian
cucurbit production areas were assessed for their sensitivity to fungicides.
Resistance to benzimidazoles was highest (44%) followed by resistance to
demethylation inhibitors (39%), organophosphates (21%), and hydroxypyrimidines
(13%). Many collections were resistant to more than one fungicide group.
Populations from rockmelon crops were more often resistant than those from less
intensively managed pumpkin crops. There were also differences in the spectra
of resistance between regions, in particular, a lower frequency of resistance
to demethylation inhibiting fungicides in New South Wales (18%) than elsewhere
(47%) anda high incidence of resistance to hydroxypyrimidines only in the
Riverland-Swan Hill region (40%). Such differences may be caused by variations
in patterns of fungicide use. The high frequency of fungicide resistance found
in this survey illustrates the need for disease control programs to be
implemented which are less reliant on the systemic fungicides.
Keywords cucurbit; fungicide resistance; Sphaerotheca
fuliginea; powdery mildew
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