Anthracnose and gray leaf spot failures

We have been seeing and hearing of control failures for gray leaf spot (Pyricularia grisea) and anthracnose (Colletotrichum cereale). These failures can have devastating effects, and the sad thing is that most could have been prevented.

This is because the majority of these failures are the result of disease resistance to certain fungicides. When resistance occurs, products that used to be effective are rendered useless. In the case of anthracnose and gray leaf spot, there are several products (see Table…