Journal Article Testing Dust Masks Against a Micronized Dust: A Test Method and Results Get access R. M. Waters, R. M. Waters Agricultural Environmental Quality Institute, Agric. Res. Serv., USDA, Beltsville, MD 20705 Search for other works by this author on: Oxford Academic PubMed Google Scholar K. R. Hill, K. R. Hill Agricultural Environmental Quality Institute, Agric. Res. Serv., USDA, Beltsville, MD 20705 Search for other works by this author on: Oxford Academic PubMed Google Scholar E. S. Fields, E. S. Fields Agricultural Environmental Quality Institute, Agric. Res. Serv., USDA, Beltsville, MD 20705 Search for other works by this author on: Oxford Academic PubMed Google Scholar J. R. G. Jones J. R. G. Jones Agricultural Environmental Quality Institute, Agric. Res. Serv., USDA, Beltsville, MD 20705 Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Economic Entomology, Volume 67, Issue 3, 1 June 1974, Pages 449–450, https://doi.org/10.1093/jee/67.3.449 Published: 01 June 1974 Article history Received: 24 October 1973 Published: 01 June 1974

In a comparison of test materials for control of Trialeurodes vaporariorum (Westwood), resmethrin was the most effective spray and controlled all stages but the eggs. Resmethrin mists and aerosols gave good control of whitefly adults and young nymphs in the winter, but were less effective in the warmer months. Azinphosmethyl, Dasanit® (O,O-diethyl O-[p-(methylsulfinyl) phenyl] phosphorothioate), and parathion also gave good control of nymphs in spray tests. Phytotoxicity of the resmethrin formulations appeared minimal except with poinsettia. When resmethrin mist was applied once a week (1 or 0.5 g AI/1000 ft3) it gave excellent control of whitefly during the cool winter, but effectiveness decreased as temperatures increased. By mid-June, applications of the higher dose gave only fair control. Generally, the mists controlled the adults, crawlers, and young nymphs, but were ineffective vs. eggs, older nymphs, and pupae. However, resmethrin 2 EC applied as a spray once a week for 4 weeks virtually eradicated infestations.

Gas chromatographic analysis of dust trapped by an electrostatic precipitator in a specially designed test apparatus was used to evaluate the ability of 3 types of respiratory protective devices to filter micronized insecticidal dusts. Combination filter cartridges were found to be 99.2% efficient in preventing the passage of micronized dust under test conditions, whereas white fiber filter masks and urethane foam rubber masks were 83.6% and 48.1% efficient, respectively.