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Impact of infection with the nematode, Steinernema feltiae on the desert locust, Schistocerca gregaria (Forskol.) nymphal mortality, physiology and biochemistry, at the nematode concentrations of 10, 50 and 100 IJs/gm soil under the laboratory conditions was studied. All the locust nymphs were susceptible to S. feltiae and recorded high mortality rate. The enzyme phenoloxidase activity was elevated at the three concentrations of nematode’s suspension. The peroxidase enzyme activity fluctuated between induction and inhibition by the nematode infection. Total insect protein, carbohydrate and lipid contents declined dramatically in all treatments. The results suggest the possibility of safe using the nematode, S. feltiae to control S. gregaria nymphs.