Japanese Beetle Adults on Rose Plants, Eaton Co., Mi 1994

Rose plants of several varieties were used for this test at a residence in Eaton Co. The plants were 2-3 ft tall in 2 gal pots. The plants were treated on 21 Jul in the Pesticide Research Center greenhouses, Michigan State University, just before they were transported to a residence in Eaton Co. with an active Japanese beetle infestation. The liquid insecticides were mixed with one liter of water and sprayed with a hand-held CO, R&D Sprayer with a single 8003 nozzle at 38 psi except the Marathon which was incorporated into the top of the pot. All of the treatments were replicated 6 times, each replicate being a single plant. The varieties of roses were assigned to treatments such that each treatment had one plant of each variety. The plants were fertilized at the time of treatment and were watered every other d throughout the test. Treatments were evaluated on 29 Jul and 5 Aug by counting all Japanese beetle adults on the plants and by counting the no. of damaged leaves.