Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2003
Publication Date: 6/1/2003
Citation: Larkin, R.P. 2003. Combining biological products and green sprouting for control of soilborne diseases of potato. Phytopathology. 93: S48
Technical Abstract: Commercially-available biocontrol products were evaluated, alone and in combination with green sprouting to promote early emergence, for efficacy in controlling Rhizoctonia and other soilborne potato diseases in field tests in Newport, Maine. Two bacterial formulations, Deny (Burkholderia cepacia J82) and Kodiak (Bacillus subtilis GB03), and two fungal preparations, RootShield (Trichoderma harzianum T-22) and SoilGard (Trichoderma virens Gl-21), were tested along with a chemical control. All treatments reduced the incidence and severity of stem canker compared to a pathogen-treated control (25-89% reduction). No treatments consistently reduced black scurf on tubers, although Kodiak, Deny, and SoilGard reduced scurf severity in some years. Green sprouted seed (GS) reached 95% emergence 7-9 days earlier than nonsprouted seed (NS) and showed fewer emergence problems. Overall, GS reduced stem and stolon canker, black scurf, and common scab compared to NS plants. Interactions between sprouting and biocontrol factors were not significant for any parameter, indicating there were no enhanced effects of the combination.