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Experiments were conducted to determine the relative values of various insecticides used in baits and as dusts for the control of the common black field cricket. Sodium fluosilicate, as used in baits, proved a most satisfactory insecticide. For use in houses, and other places where bait could not be applied satisfactorily, pyrethrum powder applied as a dust proved very effective in killing the insects.

This paper is the result of 12 years of study of the common black field cricket, Gryllus assimilis (Fab.), in South Dakota. In this paper the economic importance of the cricket is discussed, and this is followed by an account of the distribution of the pest over South Dakota. The systematic status of the insect is treated, and then follows a discussion of the life history. The paper is concluded with an account of the relative importance of the parasitic and predaceous enemies of the cricket and finally with a discussion of control measures.

Much new information is here presented on the field cricket ( Gryllus assimilis ) as a cotton insect. Results of observations and experiments on habits, life history, and methods of control are given.