A 2-year study was conducted in Illinois, Indiana, Iowa, and Ontario in 2013 and 2014 to determine the effects of planting date, seed treatment, and cultivar on plant population, sudden death syndrome (SDS) caused by Fusarium virguliforme, and grain yield of soybean (Glycine max). Soybean crops were planted from late April to mid-June at approximately 15- day intervals, for a total of three to four plantings per experiment. For each planting date, two cultivars differing in SDS susceptibility were planted with and without fluopyram seed treatment. Mid-May plantings resulted in higher disease index compared with other planting dates in two experiments, early June plantings in three, and the remaining six experiments were not affected by planting date. Soil temperature at planting was not linked to SDS development.Root rot was greater inMay plantings formost experiments. Resistant cultivars had significantly lower disease index than the susceptible cultivar in 54.5% of the experiments. Fluopyram reduced disease severity and protected against yield reductions caused by SDS in nearly all plantings and cultivars, with a maximum yield response of 1,142 kg/ha. Plant population was reduced by fluopyram seed treatment and early plantings in some experiments; however, grain yield was not affected by these reductions. Yields of plots planted in mid-June were up to 29.8%less than yields of plots planted in early May. The lack of correlation between early planting date and SDS severity observed in this study indicates that farmers do not have to delay planting in the Midwest to prevent yield loss due to SDS; cultivar selection combined with fluopyram seed treatment can reduce SDS in early-planted soybean (late April to mid May).
|Number of pages||9|
|State||Published - Aug 2016|
Bibliographical noteFunding Information:
This study was partially funded by Bayer CropScience soybean checkoff programs through the North Central Soybean Research Program in the United States and the Grain Farmers of Ontario in Canada, which obtained funding through the Ontario Farm Innovation Program, a component of Growing Forward 2. We thank S. Wiggs (Iowa State University), J. Ravellette, N. Anderson, A. Ramirez, J. Solis, K. Raun, and J. Leuck (Purdue University), K. Ames and J. Weems (University of Illinois), and C. Van Herk and G. Kotulak (Ontario Ministry of Agriculture Food and Rural Affairs) for trial establishment, maintenance, and data collection; and J. Batzer for reviewing this manuscript.
© 2016 The American Phytopathological Society.
ASJC Scopus subject areas
- Agronomy and Crop Science
- Plant Science