New Zealand Journal of Crop and Horticultural Science abstracts
Use of demethylation inhibiting fungicides (DMIs) for the control
of onion white rot (Sclerotium cepivorum Berk.) in New Zealand
R. A. FULLERTON1
A. STEWART2
E. A. SLADE1
1The Horticulture and Food Research
Institute of New Zealand
Mount Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
2School of Biological Sciences
Private Bag 92 019
The University of Auckland
Auckland, New Zealand
Abstract The demethylation inhibiting (DMI) fungicides,
tebuconazole and triadimenol, both of the triazole group, were evaluated for
the control of white rot (
Sclerotium cepivorum Berk.) on onion
(
Allium cepa L). Both fungicides, applied as foliar sprays, gave a high
degree of white rot control, effecting reductions in disease of up to 85% of
that in untreated plots. When applied as a soil surface spray immediately after
sowing, tebuconazole provided a high level of protection all season. The
greatest degree of control was obtained from a combination of seed treatment
with procymidone (a dicarboximide fungicide), followed by foliar sprays of
either procymidone, tebuconazole, or triadimenol. Tebuconazole was unsuitable
for seed treatment, causing high seed and seedling mortality. For maximum
control of white rot, a combination of seed treatment and foliar sprays should
be used. The triazoles--tebuconazole and triadimenol are suitable alternatives
to procymidone for foliar sprays.
Keywords Allium cepa; chemical control;
dicarboximides; onion; procymidone; Sclerotium cepivorum; triazoles;
tebuconazole; triadimenol; white rot
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
121-125
0114-0671/95/2302--0121 $2.50/0 (c) The Royal Society of New Zealand
1995
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