Silver scurf is a surface blemish disease of potato (Solanum tuberosum L.) tubers caused by Helminthosporium solani Durieu & Mont. Silver scurf is becoming a disease of high economic impact. In this study, the effect of different iron (FeSO 4, FeCl 2) and nitrogen (NaNO 2, NaNO 3, NH 4Cl, NH 4NO 3) salts on H. solani conidial germination and on potato silver scurf development was evaluated. The results show that iron and nitrogen salts affect in vitro germination of H. solani conidia. Conidia were particularly sensitive to FeSO 4 and FeCl 2. These salts completely inhibited conidial germination and were shown to be toxic at a concentration of 0.9 mM. Among the nitrogen salts tested, conidia were most affected by NaNO 2 and NH 4Cl, which almost completely inhibited their germination at a concentration of 169.7 mM. NaNO 2 was also toxic to conidia. Among the salts tested, only FeSO 4, FeCl 2 and NaNO 2 reduced the development of silver scurf. Comparison of the effect of the different tested salts leads to the conclusion that ions Fe ++ and NO 2 - have toxic effects on the conidia and repressive effects on silver scurf development while NO 3 - and NH 4 + have no toxic effect on conidia and no repressive effect on silver scurf development.

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Keywords antifungal, conidial germination, Helminthosporium solani, iron, nitrogen, potato, silver scurf
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Journal Canadian Journal of Plant Pathology
Mimee, B. (Benjamin), Avis, T, Boivin, S. (Sophia), Jabaji, S. (Suha), & Tweddell, R.J. (Russell J.). (2011). Effect of iron and nitrogen on the development of Helminthosporium solani and potato silver scurf. Canadian Journal of Plant Pathology, 33(4), 506–511. doi:10.1080/07060661.2011.610826