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Most of the hazelnut production in Oregon, a value of $130 million in 2014, was based on eastern filbert blight (EFB) susceptible cultivars. On these cultivars, EFB management involves, among other tactics, fungicide treatment during bud break and early shoot growth. Many active ingredients have been shown to be effective against EFB. This report summarizes the evaluation of quinone outside (QoI, FRAC group 11) and succinate dehydrogenase (SDHI, FRAC group 7) inhibitors alone and in combination with each other or with demethylation-inhibiting (DMI, FRAC group 3) fungicides for management of EFB. Based on a meta-analysis, picoxystrobin, pyraclostrobin, or trifloxystrobin alone resulted in significant control over nontreated trees ranging between 64 and 74%. Fluoxastrobin was not as effective as other QoI fungicides with an average of 44% control and high variability. SDHI fungicides as a group were less useful for management of EFB with boscalid, fluopyram, and penthiopyrad ineffective while fluxapyroxad averaged 83% control against EFB. Prepackaged mixes of QoI materials with either SDHI or DMI fungicides were also significantly effective against EFB. Use of QoI fungicides and the SDHI material fluxapyroxad offers added flexibility and complexity within EFB management programs. Growers can incorporate any of five different modes of action in EFB management programs including FRAC groups M1, M5, 3, 7, and 11.

Evaluation of Quinone Outside and Succinate Dehydrogenase Inhibitors for Effectiveness Against Eastern Filbert Blight of Hazelnut