Seventy-two candidate chemicals were evaluated as chemosterilants for Tetranychus urticae Koch. Sixty-five materials had little or no effect on egg hatch but 6 caused some reduction in number of eggs deposited, and 7 were equal to or superior to apholate in reducing hatch. Also, 6 materials were toxic to the mites at the higher concentration, and 2 were highly phytotoxic.