Chinch Bug Control, Ingham Country, Mich., 1990

A grid of 4 × 4 ft plots separated by 1 ft wide buffer strips was set-up in a home lawn with a heavy infestation of chinch bugs in Okemos, Mich. After precounts, 5 replications of each treatment were applied on Jul 24, between 11:00 am and 4:00 pm. Temperature at application was 75°F and conditions were still. All products wree applied with a single nozzle, hand held C02 sprayer from R&D Sprayers. The application was made at 50 psi through an 8003 nozzle. Insecticides were mixed with water and applied at a rate of 242.2 ml/16 ft2 (4 gal/1000 ft2). Postcounts were made 8 d later on 1 Aug. For the precounts and postcounts, each plot was divided in two and each 2 × 4 ft half was counted for 2 minutes. The 2 counts from each replication were then totaled. The test was conducted at a home lawn with a mixture of Kentucky bluegrass and fine fescue, a 0-Ys inch thatch layer, and sandy soil. The area was damp from rain at the time of application; it had rained several times the previous wk. Many chinch bugs infected with Beauvaria hassiana were sporulating during the postcounts.