사과 흰비단병 방제를 위한 살균제 선발 및 살포 체계 개발

초록

In August 2023, apple southern blight caused by Agroathelia rolfsii were observed on the apple rootstocks (Malling 9) in apple nursery tree fields located in Yeongcheon-si, Gyeongbuk province in Korea. Since no fungicides have been registered in Korea for controlling the A. rolfsii on apples, we evaluated the efficacy of 20 fungicides which registered on apple using fungicide-amended media to find efficacy for inhibiting mycelial growth and sclerotial germination. As a result, fluxapyroxad SC, pyraziflumid SC, fluazinam WP, difenoconazole WG, metconazole SC, myclobutanil WP, tebuconazole SC, prochloraz manganese WP and mancozeb WP exhibited over 90% efficacy in inhibiting mycelial growth and sclerotial germination. The selected fungicides were then applied to the affected apple nursery via soil drench treatment to evaluate their efficacy under field conditions. As a result, after eight applications from mid-May to late August, disease incidence rate was 49% in the untreated control group, whereas it was reduced to 14% in the treated group. It is assumed that developed fungicide program can be expected to control the occurrence of southern blight in apple nurseries.

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