A field experiment to compare the effects of four summer cover crops and three chemical fumigants on the growth and fruit production of a subsequent winter crop of tomatoes ( Lycopersicon esculentum) was conducted at the Tropical Research and Education Center, Homestead, Florida. The cover crops were sorghum sudangrass (Sorghum bicolor × S. Sudanese (Piper) Stapf), sunn hemp (Crotalaria juncea L., cv. ‘Tropic Sun’), cowpea (Vigna unguiculata L. Walp, cv. ‘Iron clay’) and velvetbean (Mucuna pruriens var. utilis (Bort) Merr.).