1a. Objectives (from AD-416):
Studies show that aerosol insecticides can kill the red flour beetle and confused flour beetle in flour mills, and that aerosols also give residual control. In this project we will evaluate different aerosols applied from a portable application system, compare the residual control with aerosols applied through a fixed application system, and evaluate if the aerosols are dispersing to obstructed sites within a mill.
1b. Approach (from AD-416):
We will conduct studies to evaluate dispersion of aerosols in field sites using different aerosols applied from a portable application system, and compare the residual control with aerosols applied through a fixed application system. We will conduct experiments measuring spatial variation in treatment efficacy in food facilities. We will also conduct long-term monitoring studies of pest population levels and environmental conditions at various facilities.
3. Progress Report:
Significant progress was made on meeting the objectives of this project. Data from experiments measuring spatial pattern in the deposition of three different aerosol insecticide formulations at two different temperatures was analyzed. Shed experiments were conducted to determine the ability of aerosol insecticides to drift under horizontal obstructions, the potential for food material accumulations to reduce insecticide exposure, and the interaction between the two factors. In collaboration with MRI Global, the interaction between aerosol insecticide droplet size and exposure time on efficacy was evaluated using an aerosol application chamber. In a mill test, droplet size and number was measured over time at different distances from the point of release and at locations with different levels of obstruction. Mortality of adult and larvae confused flour beetle were also measured at these sensor locations and will be correlated with droplet information. This research is providing important information on the factors that limit the efficacy of aerosol insecticides and identifies ways to improve the effectiveness of these treatments. Monitoring activities include phone calls, conference calls, on-site cooperator/ARS meetings, site visits, and email communications.