Background:

Dihydropyrenophorin is a macrolide fungal metabolite and derivative of pyrenophorin originally isolated fromD. avenaethat has herbicidal and phytotoxic activities.¹It is herbicidal againstS. halepensewhen used at a concentration of 0.065 µM. Dihydropyrenophorin is phytotoxic to a variety of agricultural crops, including barley, sorghum, wheat, and oats, as well as grasses, including goosegrass and Bermuda grass, in leaf puncture assays.

1.Sugawara, F., and Strobel, G.A.(-)-Dihydropyrenophorin, a novel and selective phytotoxin produced by Drechslera avenaePlant Sci.43(1)1-5(1986)