Scrutinizing fungicide residual activity

The results are perhaps not that surprising, since many have drawn the same conclusions based on field observations. But Dr. Rick Latin of Purdue University has documented and compared the residual efficacy (longevity) of four key fungicides used against dollar spot in a three year lab and field study. Major bullet points from his work include:

- There were four fungicides tested on fairway height bentgrass. All, except for iprodione, were tested at the labeled rate for use on fairways.…