In a field experiment on Myakka fine sand, high populations of Belonolaimus longicaudatus and Hoplolaimus galeatus and a moderate population of Paratrichodorus christiei developed on a summer cover crop of sorghum-sudangrass hybrid (Sorghum bicolor X S. sudanense). Populations of B. longicaudatus increased moderately on cowpea (Vigna unguiculata) but populations of H. galeatus and P. christiei did not increase on this crop. Populations of B. longicaudatus and H. galeatus did not increase on hairy indigo (Indigofera hirsuta) and joint verch (Aeschynomene americana) but a moderate increase of P. christiei occurred on both. No increase in nematode numbers was found in fallow plots, but a moderate population of H. galeatus persisted during 3 months of fallowing. In-row applications of 2.24 kg ai/ha of fenamiphos significantly increased the yield of the first crop (cabbage) following sorghum-sudangrass but not following the other cover crops or fallowing. Yields of the second crop in the
