Control of Japanese Beetle Adults on Rose With Sevin, 1985

The container grown roses were trimmed immediately prior to spraying to remove damaged foliage and provide similar sized plants. Flower blossoms were trimmed from the plants as they opened through the test period. Four 3-plant replicates were arranged in a randomized complete block in a mowed field in Wooster, OH. All treatments were sprayed 30 Jul. Sevin 80S was applied with a hand-pumped compressed air sprayer to the point of runoff. Sevin XLR Plus was applied with an ultra-low volume applicator at 1 part XLR in 11 parts water and 1 part XLR in 39 parts water. Treatments were evaluated by counting the number of beetles feeding on the plants (the 3-plant replicates were averaged to provide one number per replicate) and by taking feeding-injury ratings. The injury ratings were 0-10% damaged leaves = 0, 10-25% = 1, 25-40% = 2, 40-60% = 3, 60-75% = 4, 75-90% = 5, and 90-100% = 6 (individual ratings were taken for each plant in the replicate, then averaged for a single rating per replicate). 4.77 inch rain occurred during the test period.