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Effect of a combination of chlorine dioxide and thiophanate-methyl pre-planting seed tuber treatment on the control of black scurf of potatoes |
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| Authors: | Deena Errampalli Rick D Peters Kathy MacIsaac Danny Darrach Peter Boswall |
| Institution: | aAgriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, P.O. Box 6000, 4902 Victoria Ave. N. Vineland Station, Ont., Canada L0R 2E0 bAgriculture and Agri-Food Canada, Crops and Livestock Research Centre, 440 University Ave., Charlottetown, PEI, Canada C1A 4N6 cPrince Edward Island Department of Agriculture, Fisheries and Aquaculture, Box 1600, Charlottetown, PEI, Canada C1A 7N3 |
| Abstract: | The pre-planting seed tuber treatments of chlorine dioxide (ClO2), thiophanate-methyl (TPM), and a combination treatment of ClO2, followed by TPM, were evaluated for control of stem canker and black scurf (Rhizoctonia solani), and storage rots; black scurf, common scab (Streptomyces scabies), dry rot (Fusarium spp.) and silver scurf (Helminthosporium solani) on potato (Solanum tuberosum L.) cv. Kennebec. Field experiments were conducted in two consecutive years, 1999 and 2000, at the Agriculture and Agri-Food Canada Research Farm in Harrington, Prince Edward Island (PEI), Canada. The combination treatment of ClO2 (200 μg g?1) and TPM (50 g active ingredient100 kg?1 of tubers) significantly (P=0.05) reduced stem canker and black scurf on progeny tubers at harvest and after storage. The low incidence of scab and dry rot in untreated controls hindered the evaluation of the efficacy of the combination treatment and also showed that conditions were not favourable for disease development during this period at Harrington. The combination treatment was not effective on silver scurf in storage. A comparison among control, ClO2, TPM, and the combination treatment indicates that pre-planting ClO2 treatment may have killed the majority of the black scurf sclerotia on the tuber surface and that the combination of TPM fungicide treatment following ClO2 treatment gave protection to progeny tuber by suppressing the growth of the R. solani. A higher marketable yield was observed in the combination treatment as compared with the untreated control. Phytotoxicity was not observed in tubers treated with the combination treatment. |
| Keywords: | Black scurf Common scab Rhizoctonia solani Storage diseases Streptomyces scabies Thiophanate-methyl |
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