ISHS Acta Horticulturae 556: V International Congress on Hazelnut
FUNGICIDE CONTROL OF EASTERN FILBERT BLIGHT |
| Authors: | J.W. Pscheidt, S. Cluskey |
| Keywords: | Anisogramma anomala, Corylus avellana, hazelnut, chlorothalonil, demethylation-inhibiting fungicide, strobilurin |
| Abstract:
The management of eastern filbert blight (EFB) using different chemicals, rates, numbers of applications and timings has been intensively investigated on young trees since 1988. Healthy, 2-year-old trees were inter-planted within heavily diseased orchards during the dormant season, sprayed with fungicides during early spring growth, then tended until evaluated for EFB cankers the following year. These trees were never used again for testing, as a new set of trees was used each year. Chlorothalonil (Bravo 720) is rated as an excellent material based on consistent performance when used three or more times in the spring and overall efficacy. The copper-based products such as Bordeaux (copper sulfate plus hydrated lime) and copper hydroxides are rated as good materials against EFB. Many of the DMI type fungicides with locally systemic activity, such as propiconazole (Orbit) and tebuconazole (Elite), are very effective. Programs involving applications of chlorothalonil at budbreak followed by DMI fungicides have been more effective than either chemical alone. Many older materials with protection activity, such as dodine, thiram and ziram, have also been very effective. Strobilurins have had mixed success against EFB. Weather monitoring is being investigated to determine the need for applications of fungicide beyond budbreak. Combined with non-chemical control tactics, fungicides will be a key support in building a bridge to the next generation of hazelnut cultivars. | |
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