Effectiveness of Dichlorvos in Resin Strips for the Control of the German Cockroach, Blattella germanica1

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Abstract
Dichlorvos resin strips were tested in the laboratory and field for control of German cockroaches, Blattella germanica (L.). In the laboratory, caged cockroaches were placed in a 6-ft chamber for a 4-hr exposure period. Mortality rates and hatch from oothecae were recorded. In the field, caged cockroaches were placed in treated rooms for 2 days. Daily counts of mortality were recorded for both sexes. Chlordane-resistant cockroaches (Purdue strain B) were less susceptible to the dichlorvos treatments at all concentrations tested than were normal cockroaches. In laboratory tests, the LD50 for normal females was 0.063 μg/liter and that for chlordane-resistant females 0.226 μg/liter. Both strains when exposed to all concentrations tested showed higher oothecae drop and lower percent hatch than checks. Field results indicated that in unventilatcd arras resin strips containing 20% dichlorvos applied at 37.5 in.2/1000 ft3 for 48 hr produced 100% mortality. Dosages as high as 127.5 in.2/1000 ft3 did not exterminate cockroaches in wellventilated rooms in the same time period. In air-conditioned rooms, 90% of cockroaches were killed in open areas and 50% in hidden areas.

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