Abstract
Gloxinia plants were obtained in flats from Earl J. Small Inc. in Florida, and transplanted to 6-inch :lay pots on 5 May. Plants were grown in a thrips infested greenhouse at the Pesticide Research Center at Michigan State University. The pre-treatment counts were made on 24 Jul by collecting 2 buds per plant, extracting the thrips with EtOH, filtering through a Buchner funnel and counting the number of thrips under a dissecting microscope. Only 3 of the 7 replicate plants were sampled for precounts since only 25% of the plants had begun to flower. Pre counts were used to block the treatments. The treatments were sprayed on 28 Jul, 1 Aug, 4 Aug, and 8 Aug with a handheld R&D CO2 sprayer with an 5008 nozzle at 30 psi. On 11 Aug, flowers were collected to determine efficacy of insecticide treatments against thrips. One or two flowers were collected rom each plant. Some plants had flowered and already dropped their flowers, but at least 5 plants in each treatment had flowers suitable for sampling (n = 5 - 7) except for 3 treatments in which the treatments severely damaged the flowers. Counts from plants with only one flower were doubled to correate with the remaining plants which all were sampled using two flowers.