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The effects of 3 plant species (Cornus florida [dogwood], rhododendron X ‘Chionoides' [rhododendron], and Ilex opaca [American holly]), 4 insecticide treatments (Demand® CS [lambda-cyhalothrin] at 6.25 ml[AI]/liter; Talstar® Professional [bifenthrin] at 7.81 ml[AI]/liter, and Suspend® Polyzone® [deltamethrin] at 11.72 ml[AI]/liter, and water), and 2 physiological states (blood-fed and unfed) were evaluated for knockdown (1 h) and mortality (24 h) against female Aedes albopictus over an 8-wk sampling period. Analyses determined that there was a significant interaction between the tested plant species and the insecticides evaluated. Significant differences were likewise observed between the insecticide treatments for unfed Ae. albopictus females, with Demand CS demonstrating the highest knockdown and mortality rates (from &amp;gt;90% to &amp;gt;10% at wk 8 and &amp;gt;95% to ∼50% at wk 8, respectively), followed by Talstar Professional (from &amp;gt;75% to &amp;lt;10% at wk 2 and &amp;gt;90% to &amp;lt;10% at wk 2, respectively) and Suspend Polyzone (from &amp;gt;20% to &amp;lt;10% at wk 8 and &amp;gt;25% to &amp;gt;50% at wk 8, respectively). All treatments were no longer significant for knockdown or mortality at the end of the 8-wk timeframe. Significant differences were also observed between insecticide treatments for blood-fed Ae. albopictus females; Demand CS showed high knockdown and mortality rates (from 100% to ∼50% at wk 8 and 100% to &amp;gt;60% at wk 8, respectively), Suspend Polyzone rates were similar to Demand CS (from &amp;gt;80% to ∼50% at wk 8 and ∼90% to &amp;gt;65% at wk 8, respectively), and both were followed by Talstar Professional (from 100% to &amp;lt;10% at wk 4 and 100% to &amp;lt;20% at wk 4, respectively). All tested pyrethroid sprays showed a significant increase in effectiveness against recently blood-fed Ae. albopictus females, as compared to the unfed females. These results suggest that Demand CS can be used as an effective barrier spray against Ae. albopictus adults due to the limited impact of target foliage, its long-term efficacy under environmental conditions, and its continued effectiveness regardless of the blood meal status of the target mosquito.

Effects of Plant Substrate, Insecticide, and Blood Meal Status on the Efficacy of Barrier Treatments Against Aedes albopictus