Infection of Soybean Seed by Fusarium graminearum and Effect of Seed Treatments on Disease Under Controlled Conditions

• DOI: 10.1094/pdis-05-10-0317
• Publication Date: 2010-12-07T16:49:25Z
• Authors: M. L. Ellis; K. D. Broders; P. A. Paul; A. E. Dorrance
• Keywords: Fludioxonil; Captan; Seed treatment; Metalaxyl

Fusarium graminearum causes seed decay and damping-off of soybean. This study evaluated the effect inoculum density F. graminearum, temperature, fungicide treatments on disease development. To determine optimum conditions for development, individual soybean was inoculated with 100 μl a suspension 2.5 × 102, 103, 104, or 105 macroconidia/ml in rolled-towel assay at temperatures 18, 22, 25°C. Inoculum concentrations 104 higher were necessary development all temperatures. The efficacy captan, fludioxonil, mefenoxam + azoxystrobin, trifloxystrobin, pyraclostrobin as then same macroconidia/ml. Seed treated captan 61.9 g a.i. fludioxonil 5.0 per kg developed smaller lesions than other nontreated control. Based these results, there are limited choices managing this seedling disease, it is possible that shifts treatment products may have played role recent emergence pathogen.