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Study on Sweet Potato Storage Disease and Etiology
The colony on Potato Dextrose Agar (PDA) (A), conidia (B) and sporulation on stem of sweet potato (C) of <i>Diaporthe batatas</i> strain Ph-832. The colony on PDA (D), conidia (E) and sporulation on <i>Casuarina equisetifolia</i> (F) of <i>Fusarium</i> spp. Fu239 strain. The colony on PDA (G), conidia (H) and sporulation on <i>Casuarina equisetifolia</i> (I) of <i>Lasiodiplodia theobromae</i> strain B2715.
The colony on Potato Dextrose Agar (PDA) (A), conidia (B) and sporulation on stem of sweet potato (C) of Diaporthe batatas strain Ph-832. The colony on PDA (D), conidia (E) and sporulation on Casuarina equisetifolia (F) of Fusarium spp. Fu239 strain. The colony on PDA (G), conidia (H) and sporulation on Casuarina equisetifolia (I) of Lasiodiplodia theobromae strain B2715.

Author:Chao-Jung Wu, Hong-Ren Yang, Ching-Yi Lin, Chiao-Wen Huang, Sui-Li Hsu, Su-Yu Lai, and Hui-Fang Ni*

Abstract:

    Post-harvest storage disease is one of the important limiting factor of sweet potato production. To investigate the incidence of post-harvest storage disease on sweet potato, healthy roots from Dacheng Township, Changhua County and Shueilin Township, Yunlin County were collected and stored under 15℃ for 12 wk, and fungi on rotten roots were isolated every 2 wk in period of storage. After 12 wk of storage, 436 of 504 roots from Dacheng Township and 223 of 500 roots from Shuelin Township were rotten, and isolated fungal species included Diaporthe batatas, Fusarium spp., Lasiodiplodia theobromae, Macrophomina phaseolina, Phomopsis destruens and other Phomopsis spp. Pathogenicity tests were conducted, and results showed that D. batatas, L. theobromae, M. phaseolina, P. destruens and some Phomopsis spp. were virulent, and could cause rotten symptoms on sweet potatoes, revealing the pathogenicity of these species. On the contrary, roots inoculated with Fusarium spp. did not show symptom. This study provides important reference for further fungicides screening to control the post-harvest disease of sweet potato in Taiwan.

Key words:Sweet potato, Storage disease, Dry rot, Black rot, Charcoal rot

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Journal of
Taiwan Agricultural Research
Vol. 73, No.1 (2024) ISSN: 2790-086X Vol. 73, No.1 (2024)
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