Control of Rose Aphids in a Landscape Setting, Summer 1996

Abstract

Abstract Roses are routinely planted on the UCR campus as part of the landscape. They are rarely treated for pest problems and typically exhibit moderate infestations of the more common pests. A single planting of roses approximately 30 m2 was used to determine the efficacy of selected pesticides against the rose aphid, Macrosiphum rosae (L.). The plants were arranged in seven rows of eight plants each, one meter apart. The average maximum and minimum temperatures during the trial were 98.2°F and 62.9°F. The roses were irrigated for 8 minutes two times each night three days a week, and no rain occurred during the trial. Granular applications were applied the night before spray treatments, 7 Aug, to allow an irrigation cycle to occur. Two leaves and two flowers were collected from each rose plant at each sampling time. Aphids were collected from the samples by placing the leaves and flowers in a quartsized food container filled with 80% ethanol. They were shaken for thirty seconds, and the solution was filtered through a Buchner funnel. Aphids were collected and counted on a piece of filter paper in the funnel. A pre-treatment count was taken on 6 Aug. Ten treatments and an untreated check were set up on 8 Aug. Post-treatment counts of aphids were taken weekly for four weeks after treatment (WAT). The data were analyzed using ANOVA and DNMRT was used to separate means.