Influence of fungicide spray schedules on the sensitivity of Cercospora beticola to the sterol demethylation-inhibiting fungicide flutriafol

Citation
Gs. Karaoglanidis et al., Influence of fungicide spray schedules on the sensitivity of Cercospora beticola to the sterol demethylation-inhibiting fungicide flutriafol, CROP PROT, 20(10), 2001, pp. 941-947
Citations number
27
Categorie Soggetti
Agriculture/Agronomy
Journal title
CROP PROTECTION
ISSN journal
02612194 → ACNP
Volume
20
Issue
10
Year of publication
2001
Pages
941 - 947
Database
ISI
SICI code
0261-2194(200112)20:10<941:IOFSSO>2.0.ZU;2-N
Abstract
A field experiment was conducted over a three-year period (1997-1999) to st udy the efficacy of several fungicide spray-schedules and their effects on the sensitivity of Cercospora beticola populations to the DMI fungicide flu triafol. Spray applications of flutriafol, either alone at the recommended dose, or at a reduced dose in mixtures with maneb, or in alternation with t ank mixed fentin-acetate and maneb, were included in the spray programs. Ap plications of flutriafol at the recommended dose showed a significantly gre ater control efficacy in comparison with the other treatments, while applic ations of flutriafol alternated with tank mixed fentin-acetate and maneb sh owed lower efficacy in comparison with the remaining flutriafol treatments. Fungal populations from plots continuously treated with flutriafol, either alone at the full dose or at reduced dose with maneb, had lower sensitivit y to flutriafol in comparison with populations from plots treated alternati vely with flutriafol and tank mixed fentin-acetate and maneb. Repeated appl ications of flutriafol, at full or reduced doses, favoured the selection of highly resistant strains. Since applications of flutriafol in alternation with tank mixed fentin-acetate and maneb do not maintain a high level of di sease control, the only available antiresistance strategy would be the rest riction of the number of flutriafol treatments, by applying them only when environmental conditions are favourable for disease development and by usin g alternative fungicides during the rest of the growing season. (C) 2001 El sevier Science Ltd. All rights reserved.