Getting rid of persistent anthracnose

If you are having difficulty getting rid of anthracnose, it's time to take a second look at the products you are using for control. If thiophanate-methyl (Cleary's 3336) or any of the QoI fungicides (Heritage [azoxystrobin], Compass [trifloxystrobin], Insignia [pyraclostrobin]) have been used recently with little or no success, it is possible that the fungus that causes anthracnose, Colletotrichum cereale, has developed resistance to these fungicides. When resistance develops, this means that the fungus has changed, or evolved, so that…