Control of Leafminer Larvae in Chrysanthemums, Calif., 1983

Three insecticides were evaluated for efficacy against third-stage leafminer larvae in chrysanthemums. Standardized three-leaved potted mum plants were exposed to adult leafminer 6 days before insecticide application. The test was replicated 10 times, with one plant per replicate. Larval mine counts were made prior to pesticide treatment. The materials were applied to the plant to runoff with a 1-gal pressurized B&G sprayer, with a Spraying Systems 5003 nozzle, at 60 lb/in on 21 Sep (25°C). The mum plants were cut at the base after the materials had dried and just prior to the emergence of the larvae from the leaves. The plants were placed on a layer of sand in individual petri dishes, where the larvae were allowed to exit the leaves, drop to the sand and pupate. After pupation, the sand was sifted to collect the pupae, which were counted and held for adult emergence.