Sex differences in susceptibility of house crickets, Acheta domesticus, to experimental infection with Serratia liquefaciens

Serratia liquefaciens and S. marcescens are known to infect and cause mortality in a variety of insects including Orthopterans (P. A. D. Grimont and F. Grimont, in ''Bergey's Manual of Systematic Bacteriology,'' (J. G. Holt and N. R. Krieg, Eds.), Vol. 1, pp. 477-484. Williams and Wilkins, Baltimore, MD, 1984; E. A. Steinhaus, Hilgardia 28, 351-377, 1959; G. E. Bucher and J. M. Stephens, J. Insect Pathol. 1, 356-373, 1959). Extracellular proteases and chitinase production are believed responsible for the observed toxicity (M. Kaska, J. Invertebr. Pathol. 27, 271, 1976; O. Lysenko, J. Invertebr. Pathol. 27, 385-386, 1976). In this note I report that last instar juvenile male and female house crickets, Acheta domesticus (Insecta: Orthoptera: Gryllidae) differ in their susceptibility to infection with Serratia liquefaciens.