Incidence, Distribution, and Pathogenicity of Fungi Causing Root Rot in Idaho Long-Term Sugar Beet Storage Piles

Plant Disease
Carl Strausbaugh

Abstract

Fungal rots in sugar beet roots held in long-term storage can lead to considerable sucrose loss but the incidence and distribution of fungal rots inside sugar beet piles and pathogenicity for some species is poorly understood. Thus, Idaho sugar beet held in five outdoor and two indoor piles in 2014 and 2015 were investigated. The root surface area covered by fungal growth and discolored and healthy tissue were assessed in nine 1-m2 areas per pile using a stratified random sampling design. Pathogenicity was evaluated indoors via plug inoculation in 2015 and 2016. Botrytis cinerea covered more root surface area inside indoor piles (6 to 22%) than outdoor piles (0 to 3%) (P < 0.0001). No trends were evident for the Athelia-like sp. (0 to 15%) and Penicillium-type spp. (0 to 8%). Penicillium-type isolates comprised the following species: 60% Penicillium expansum, 34% P. cellarum, 3% P. polonicum, and 3% Talaromyces rugulosus. Trace levels (<1% of root surface) of other fungi, including Cladosporium and Fusarium spp., were evident on roots and in isolations. Based on sample location in a pile, there were no trends or differences; however, two outdoor piles (OVP1 and OVP2) had more healthy tissue (90 to 96%) than other piles (28 to 8...Continue Reading

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Oct 1, 2017·Plant Disease·Carl A Strausbaugh, Frank Dugan
Jan 1, 2013·Plant Disease·Carl A StrausbaughPaul Foote
Jun 1, 2009·Plant Disease·Carl A StrausbaughDave Elison

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Citations

Aug 6, 2020·Plant Molecular Biology·Silvia MadritschEva M Sehr
Dec 29, 2020·EFSA Journal·UNKNOWN EFSA Panel on Plant Health (PLH)Claude Bragard

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