Search research reports:
Ecological and Genetic Diversity of Soilborne Pathogens and Indigenous Microflora
K.W. Seebold, M. Elliott, C. Canaday, C. Rothrock, A. Westphal, T. Keinath
Department of Plant Pathology
Vegetables and ornamentals are important crops grown in the southeastern US and suffer from a number of disease problems. The use of biological agents to manage diseases in these crops would offer an effective, sustainable, and evironmentally sound approach to management of disease. The purpose of this project is to evaluate biological agents for suppression of root diseases common to vegetable crops and bedding plants.
2009 Project Description
For Objective 1 (Examine commercial and non-commercial biocontrol agents for use as seed treatments, in-furrow treatments or as potting mix amendments), a trial was conducted in the summer of 2009 to evaluate Bioten, a commercial formulation containing Trichoderma harzianum and T. viride, for suppression of Phytophthora blight, caused by Phytophthora capsici, on summer squash when applied to soil via drip irrigation, alone or in conjunction with fungicide programs. The results of the trial showed that Bioten-containing treatments reduced the severity of Phytophthora blight by 25% over the untreated control.; however, fungicide programs that contained Ridomil Gold applied pre-plant reduced incidence by over 60% compared to the untreated control.
For Objectives 2 & 3, soils were sampled from tobacco fields maintained under conventional tillage, minimum tillage, a wheat cover crop, and a mustard cover crop. Samples were assayed for Rhizoctonia solani, and cultures will be sent for analysis to cooperator at the University of Arkansas in January, 2010.
No specific outcomes or impacts were recorded in 2009; however, one presentation was made at an international meeting dealing with biocontrol of P. capsici, and one report was published.
Seebold, K.W. and Dixon, E. 2009. Effect of Bioten and IR5885 on Phytophthora blight of summer squash, 2008. Plant Disease Management Reports 3:V151. DOI:10.1094/PDMR03.
Seebold, K.W. 2009. Alternatives to Traditional Fungicides for Managing Oomycete Pathogens of Tobacco and Vegetables. Proceedings of the 29th Congreso Nacional de Fitopatologia y Ciencias Afines, Medellin, Colombia.