The virulence of Steinernema feltiae strain SN towards house fly, Musca domestica, and nematode persistence in the bovine manure environment was examined. Nematodes were applied at the 95% LD rate of 1x106 nematodes per m2 to thirty two one liter containers containing 150 g of manure. Another thirty two containers without nematodes was the control. At weekly intervals, 100 third instar M. domestica larvae were added to four of the treated and four of the control containers. Survival was determined by adult house fly emergence. There was a twenty percent weekly decline in the infectivity of the nematodes towards house fly larvae. After four weeks there was no significant difference between treatment and control.
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