What do so-called “curative” fungicides really do?
Foliar-applied fungicides for soybeans have only become popular to use in Iowa in the past few years. There are a number of products now being sold here. The widespread availability of fungicides for soybeans has raised many questions about their efficacy against white mold, particularly at this stage in the development of the disease. Despite some of the fungicides being classified as “curative”, there most likely will be little positive effect from any fungicide applied at this time because of the stage of the disease. Remember that “curative” fungicides do not cure the disease. So, it’s mid-to-late August and some farmers are noticing white mold disease on their soybean fields. Should they spray a fungicide? The most important thing for soybean growers to do at this time is to note the presence of white mold in the field and then select for varieties with lower susceptibility or higher tolerance for white mold the next time soybeans are grown in the field. Wider rows may help with w