Chase's Fungicide Rotation Guide Have you ever had trouble remembering which fungicide to rotate with another for best control and resistance management? This handy pocket-size slide chart will solve that problem. After 25 years of experience Chase has outlined 12 fungicides that give the best control of the most common diseases from Botrytis to Pythium. Each fungicide is in a different chemical class making choice of an optimal rotation. Item #CFRG.