Chrysanthemum Phytotoxicity Evaluations, California, 1981

Four insecticides were applied weekly for 7 weeks to commercially grown chrysanthemums located in Orange County beginning Sep 1. The insecticides Dursban 25W, Monitor 4E, silicon dioxide, and SD-52618 85W were selected based on their potential ability to control the various stages of the serpentine leafminer, Liriomyza trifolii (Burgess), and due to a lack of information necessary for their registration on chrysanthemums, materials were applied to 10 row feet of each variety. Insecticides were applied at 1X, 2X and 4X concentrations where 1X = 8 oz ai/100 gal (Monitor, Dursban), and IX = 4 oz ai/100 gal (SD-52618). Silicon dioxide was applied only as a 2% solution. Applications were made with an Arimitsu sprayer with a capacity of 2.25 gpm at 150 psi and water pH was 7.0.