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Laboratory tests evaluated the toxicity of the dihaloalkyl arylsulfone biocide, A-9248 (diiodomethyl para-tolyl sulfone), when fed continuously to German cockroach nymphs from the second and fifth (last) nymphal stage until adulthood. The toxicants were formulated into diets prepared by finely grinding Wayne Rodent Blox into 5-g portions and reconstituting each with 6 ml of water and 3 ml of an acetone solution of technical A-9248. This was mixed thoroughly, pressed into plexiglass molds, and allowed to dry for 48 h within an evacuation hood, yielding pelletized diets (75-100 mg) of the desired concentration (% AI). Seven diet concentrations (10-0.156%; 0.5 times serial dilutions) were evaluated to achieve a clear representation of A-9248 activity. Groups of 10 unsexed, newly eclosed (&amp;lt;24 h) second- or fifth-stage nymphs were placed into 100- by 25-mm vented plastic Petri dishes supplied with test diet, water vial, and cardboard harborage. Each diet concentration was replicated 6 times, for a total of 60 nymphs/dilution rate.

Dietary Toxicity Trial, 1987