Random-effect meta-analyses were performed on data from 240 field trials conducted between 2005 and 2018 across nine U.S. states and Ontario, Canada, to quantify the yield response of soybean after application of foliar fungicides at beginning pod (R3) stage. Meta-analysis showed that the overall mean yield response when fungicide was used compared with not applying a fungicide was 2.7% (110 kg/ha). Moderator variables were also investigated and included fungicide group, growing season, planting date, and base yield, which all significantly influenced the yield response. There was also evidence that precipitation from the time of planting to the R3 growth stage influenced yield when fungicide was used (P = 0.059). Fungicides containing a premix of active ingredients from multiple groups (either two or three ingredients) increased the yield by 3.0% over not applying a fungicide. The highest and lowest yield responses were observed in 2005 and 2007, respectively. Better yield response to fungicides (a 3.0% increase) occurred when soybean crops were planted not later than 21 May and when total precipitation between planting and the R3 application date was above historic averages. Temperatures during the season did not influence the yield response. Yield response to fungicide was higher (a 4.7% increase) in average yield category (no spray control yield 2,878 to 3,758 kg/ha) and then gradually decreased with increasing base yield. Partial economic analyses indicated that use of foliar fungicides is less likely to be profitable when foliar diseases are absent or at low levels.
|Original language||English (US)|
|Number of pages||8|
|State||Published - May 2021|
Bibliographical noteFunding Information:
Funding: Funding for conducting field research in Canada was partially provided by the Grain Farmers of Ontario. In the United States, the funding was partially provided by the USDA NIFA Soybean Checkoff through the Illinois Soybean Association, Indiana Soybean Alliance, Iowa Soybean Association, Michigan Soybean Association, Minnesota Soybean Council, Nebraska Soybean Association, North Dakota Soybean Council, South Dakota Soybean Association, and Wisconsin Soybean Marketing Board.
© 2021 The American Phytopathological Society
- Disease management
- Foliar fungicide
- Partial economic analysis
- Yield response
PubMed: MeSH publication types
- Journal Article