 The very best white mold fungicide is Endura, but we'll get to that in just a minute. The first fungicide that you should spray in soybeans each year is actually a herbicide, Cobra. Cobra is almost as good as Endura in many tests, and it's one-tenth the money. For around four bucks an acre, six ounces of Cobra does very good. Endura is over $40 an acre, so we usually just suggest spot spraying that. While Cobra needs to be sprayed right before flowering, the best time for Endura is typically R1, which is first flower in soybeans.