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

PDF file of entire paper: medium quality (1156K); (scanned from paper original: notes about this process)

---

This year's abstracts | Journal home page | All abstracts | Publishing home page