New Zealand Journal of Crop and Horticultural Science abstracts

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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

PDF file of entire paper: medium quality (457K); (scanned from paper original: notes about this process)

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