PROMOTING ADOPTION OF COVER CROPS FOR WEED SUPPRESSION BY BROADENING THEIR UTILITY. C. A. Chase*, G. B. Braz, M. E. Swisher; University of Florida, Gainesville, FL (208)

ABSTRACT

A process involving focus groups, field research, and stakeholder evaluation is being used to evaluate and promote the use of cover crops for weed suppression in organic strawberry.  Off-season, leguminous cover crops (Aeschynomene americana, Crotalaria breviflora, Crotalaria juncea, and Indigofera hirsuta) were of interest because of their potential to provide multiple ecological services to the subsequent strawberry crop.  During the 2013 trials, C. juncea produced the most shoot biomass; however, I. hirsuta and A. americana were as effective as C. juncea in suppressing weeds.  Stakeholder recommendations were for further evaluations of C. juncea and I. hirsuta and, additionally, to evaluate cover crop mixtures and cover crops that produce a saleable product.  During the 2014 trials, weed suppression with a 4-way mixture of all the legume cover crops, Sesamum indicum (a “cash” cover crop), and I. hirsuta was not significantly different from that obtained with C. juncea.  Greenhouse assessment of Belonolaimus longicaudatus (the sting nematode) suppression by Crotalaria cover crops revealed differential susceptibility to this important pest of strawberries in Florida.