New Zealand Journal of Crop and Horticultural Science abstracts
Postharvest dipping of kiwifruit in iprodione to control stem-end rot caused by
Botrytis cinerea
N. B. PYKE1
D. G. MANKTELOW2
P. A. G. ELMER3
K. G. TATE2
1The Horticulture and Food Research Institute
of New Zealand
Riwaka Research Centre
R D 3
Motueka, New Zealand
2The Horticulture and Food Research Institute
of New Zealand
Hawkes Bay Research Centre
P.O. Box 85
Hastings, New Zealand
3The Horticulture and Food Research Institute
of New Zealand
Canterbury Research Centre
Private Bag 4704
Christchurch, New Zealand
Abstract Kiwifruit (Actinidia deliciosa (A. Chev.)
C.F.Liang et A.R.Ferguson) cv. Hayward from four orchards were treated with the
dicarboximide fungicide, iprodione, applied as a preharvest spray or a
postharvest dip to control stem-end rot caused by Botrytis cinerea
(Persoon: Fries). Differences in the incidence of stem-end rot existed between
orchards but in each orchard only low levels of infection were found. The
incidence of stem-end rot was lower in the fungicide dipped fruit than in fruit
from the control or preharvest sprayed treatments. The proportion of
dicarboximide resistance in B. cinerea isolates from fruit rots was
highest in the fruit that were dipped. There were no consistent differences
between orchards in the proportions of dicarboximide resistance. Iprodione
residue levels were higher on the dipped than on the sprayed fruit.
Keywords Botrytis cinerea; stem-end rot; kiwifruit;
Actinidia deliciosa; iprodione; post harvest dipping; resistance
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