Evaluation of Sticking Agents Mixed with Douglas-fir Tussock Moth Reference Abstract Neisess, John. 1979. Evaluation of sticking agents mixed with Bacillus thuringiensis for control of Douglas-fir tussock moth. USDA For. Serv. Res. Pap. PNW-254, 6 p. Pacific Northwest Forest and Range Experiment Station, Portland, Oregon. Eighteen sticking agents were evaluated for their ability to prevent loss of insecticidal activity of Bacillus thuringiensis formulations after exposure to simulated rain. Spray formulations containing BioFilm, High Tack Fish Glue, and Nacrylic X4260 and X4445, NuFilm 17, Plyac, and X-Link 2873 were the most active after exposure to rain. About 30 percent of the activity of Bacillus thuringiensis spray mixtures without stickers was lost after exposure to 2.54 cm of rain. KEYWORDS: Pesticide preparations, Bacillus thuringiensis, insecticides RESEARCH SUMMARY Research Paper PNW-254 1979 Eighteen sticking agents were evaluated for their ability to prevent loss of insecticidal activity of Bacillus thuringiensis formulations after exposure to simulated rain. The B. thuringiensis was mixed in three carrier solutions: water, 25 percent molasses, and 25 percent Sutro, and bioassayed against Orgyia pseudotsugata (McDunnough). Of the various stickers tested, only Carboset 525 adversely affected B. thuringiensis activity. Spray mixtures containing molasses or Sutro lost more activity after exposure to rain than did the water mixtures, and spray formulations containing BioFilm, High Tack Fish Glue, Nacrylic X4260 and X4445, NuFilm 17, Plyac, and X-Link 2873 were the most active after exposure to rain. 30 percent of the activity of B. thuringiensis spray mixtures without stickers was lost after exposure to 2.54 centimeters of rain. About |