Insecticide resistance in eggs and first instars of the bed bug (Hemiptera:Cimicidae)

Pyrethroid resistance has been well documented in adult bed bugs. The goal of this study was to determine insecticide resistance in eggs and first instars of the common bed bug. Three strains of bed bugs were used for this study, one susceptible and two resistant field collected strains. Mortality was monitored for eggs and first instars treated with two insecticides (Temprid SC and Transport GHP). LC₅₀ values were determined for both life stages. Using the calculated LC₅₀ values, resistance ratios were then determined for eggs and first instars. Higher concentrations of insecticides were required for egg and first instar mortality from resistant populations. Transport GHP was the most effective insecticide.  This work suggests that different bed bug life stages could have similar resistance mechanisms as adults.