Example 31

Etofenprox and farnesene were tested for efficacy against 3- to 5-day old adult Aedes aegypti. For the following concentrations 3% farnesene, 0.002 μg/mosquito of etofenprox, and 0.002 μg/mosquito of etofenprox with 3% farnesene, at 1 hour we obtained 7%, 83%, and 60% knockdown respectively. At 24 hours we obtained 13%, 53%, and 50% mortality respectively. The CO2 control and acetone standard both had 0% knockdown at 1 hour, and 0% mortality at 24 hours. Results are shown in Table 21.

TABLE 21
Efficacy of farnesene, etofenprox, and a combination of both
against adult, virgin, female Aedes aegypti mosquitoes.
% MORTALITY
ACTIVE INGREDIENTCONCENTRATIONAFTER 24 HRS
FARNESENE3%13
ETOFENPROX0.002 μg53
OBS.*CALC.**
FARNESENE + 3% + 0.002 μg5059.11
ETOFENPROX
*Obs. = observed efficacy
**Calc. = efficacy calculated using Colby (1967) formula
Since the calculated insecticidal kill rate exceeds the observed value, then the action of the combination is antagonistic.

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