The host range ofSpongospora subterranea f. sp.subterranea in the United States
This study was performed to determine the host range ofSpongospora subterranea f. sp.subterranea on common crops and weeds in the northeastern United States. Seedlings of the plants were grown in nutrient solutions and inoculated with spore balls ofS. subterranea. The roots were microscopically examined for the presence of plasmodia or zoosporangia 14 days after inoculation. The plants were then transferred to a greenhouse and grown in a soilless mix. The roots were examined for the presence of symptoms and spore balls after 4 months. Of 26 species within 10 families from monocotyledons and dicotyledons tested, 16 species were found to be susceptible toS. subterranea. Twelve species were newly recorded hosts forS. subterranea. Gall symptoms were observed on the roots of six species and spore balls were found on three species. Evidence is presented for the first time that galls and spore balls ofS. subterranea might form on non-Solanaceous species. This investigation is important for the cultural management of potato powdery scab disease because there currently are no effective controls.
Additional Key WordsSolanum tuberosum
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- Calvert EL. 1968. The reaction of potato varieties to potato mop-top virus. Rec Agric Res Mini Agric North Ireland 17:31–40.Google Scholar
- Christ BJ. 2002. Is powdery scab a new concern? Valley Potato Grower (March): 26–27.Google Scholar
- Doyle JJ and JL Doyle. 1990. Isolation of plant DNA from fresh tissue. Focus 12:13–15.Google Scholar
- Karling JS. 1968. The Plasmodiophorales, 2nd ed. Hafner Publishing Co., New York.Google Scholar
- Merz U. 1989. Infectivity, inoculum density and germination ofSpongospora subterranea resting spores: a solution-culture test system. EPPO Bulletin 19:585–592.Google Scholar
- Osborn TGB. 1911.Spongospora subterranea (Wallroth) Johnson. Ann Bot 25:327–341.Google Scholar
- Wale SJ. 1987. Powdery scab — are there any easy solutions? Potato World 4:8–9.Google Scholar
- White NH. 1954. The use of decoy crops in the eradication of certain soil-borne plant diseases. Aust J Sci 17:18–19.Google Scholar
- Würzer B. 1964. Ergäzende Untersuchungen über den Pulverschorf der Kartoffel und dessen ErregerSpongospora subterranea (Wallr.) Lagerh. Landwirtschaftliche Hochschule. Dissertation. Hohenheim, Germany.Google Scholar