Efficacy of non-conventional fungicides for control of the plant pathogens Clarireedia jacksonii and Microdochium nivale

Several non-conventional fungicides were tested against two turfgrass pathogens, Clarireedia jacksonii and Microdochium nivale. These were tested in lab and field conditions at different rates to a conventional fungicide, propiconazole. Treatments that showed initial efficacy in lab trials included ferric sulfate, hydrogen peroxide, phosphite, Sunlight dish soap, garlic powder, boric acid, sodium chloride, and acetic acid. These were then tested in field trials. Most treatments were ineffective, but ferric sulfate was found to significantly inhibit C. jacksonii on Agrostis stolonifera at 129 g/100 m2 and showed highest inhibition at 253 g/100 m2 with 42-96% disease suppression in multiple field tests. Inhibition of M. nivale by ferric sulfate in the field was inconsistent in three field tests over two years. Significant foliar darkening by ferric sulfate (almost phytotoxicity) occurred at ~436 g/100 m2 on Agrostis stolonifera, ~349 g/100 m2 on Lolium perenne, and ~621 g/100 m2 on Poa pratensis.