EVALUATION OF VARIOUS MATERIALS FOR REDUCING PLANT INJURY BY THIELAVIOPSIS BASICOLA TO FLUE-CURED TOBACCO SEEDLINGS GROWING IN A T-RAIL GREENHOUSE SYSTEM
County Extension Coordinator
University of Georgia
~~A variety of fungicides (Topsin, Procure and Folicur ) were applied as drench treatments to trays of seedlings in which Thielaviopsis basicola had been diagnosed as the cause for stunted and yellowing plants. Affected plants were pale yellow and smaller than neighboring healthy plants and in most cases limited to individual trays. Trays were black, hard, plastic and were previously washed with a sodium hypochlorite solution before filling with media. Stunting was evident early to mid season transplant production season. On hot days, leaves of the diseased plants wilted more rapidly than those of healthy plants, but recover during the night. The most distinctive symptoms of black root rot occur on the roots. The entire root system is greatly reduced with smaller roots exhibiting a typical brown to black discoloration of their tips, and larger roots having brown or black spots on their surface. The outer root tissue may slough easily and the root mass is insufficient to hold the media together so that all the media in the cell is pulled out at one time. It has been suggested that some sterol inhibitors (triazoles) have activity against T. basicola Plant vigor ratings and growth measurements were taken. There appear to be materials that may be helpful to growers who find seedling resulting from Thielaviopsis basicola early in the production season.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
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Authors: J.S. Shealey
Shealey, J. County Extension Agent ANR, County Extension Coordinator, Unversity of Georgia, Georgia, 31648