Poster Session: Integrated Pest Management

309-P

Evaluation of fungicides and biorational products for management of Pythium and Rhizoctonia damping-off in greenhouse-produced vegetables.
F. Baysal-Gurel (1), S. A. MILLER (1)
(1) The Ohio State University, Wooster, OH, U.S.A.

Damping-off, caused by Pythium spp. and Rhizoctonia solani, can cause significant losses in transplant and micro-vegetable production in protected environments. Experiments were performed in a greenhouse to determine the efficacy of biopesticides and fungicides against Pythium and Rhizoctonia damping-off in lettuce and pepper. Treatments applied were Rootshield Home and Garden, Rootshield PLUS WP, Rootshield WP, Prestop, Actinovate, Mycostop, Serenade Soil, Subtilex, Regalia, SoilGard and the fungicides Double Nickel LC, Previcur Flex, Banrot and Phosphite. The center 48 cells of 288-cell trays were filled with P. ultimum or R. solani-infested potting mix (0.5 g inoculum/100 ml Fafard’s Superfine Germinating mix) and the remaining cells of each flat were filled with non-inoculated potting mix. Treatments were applied to the entire flat, with the exception of the Root Shield Home and Garden, Rootshield PLUS WP and Rootshield WP treatments, which were only applied to the center 48 cells of each flat. Rootshield Home and Garden, Rootshield PLUS WP, Rootshield WP and Double Nickel LC were consistently effective in reducing Rhizoctonia damping-off in pepper and lettuce. While no product was effective in reducing Pythium damping-off in pepper, Prestop, Double Nickel LC, Rootshield Home and Garden, Rootshield PLUS WP, Mycostop, Previcur Flex, Serenade Soil and Regalia effectively controlled Pythium damping-off in lettuce.