EFFECT OF VEGETABLE AND MINERAL OILS ON THE DEVELOPMENT OF SPHAEROTHECA PANNOSA VAR. ROSAE THE CAUSAL AGENT OF POWDERY MILDEW OF ROSE

A. T. Wojdyla

Abstract: The study assessed the efficacy of vegetable cooking oils (corn, olive, rapeseed, sunflower, soybean, and grape seed), ready-made vegetable oils designed for use in plant protection (Adpros 850 SL, Dedal 90 EC, Olejan 85EC), and mineral oils (Atpolan 80 EC, Ikar 95 EC, Olemix 84 EC, Para Sommer 75 EC, Promanal 60 EC, Sunspray 850 EC) in the protection of roses grown under cover against powdery mildew (Sphaerotheca pannosa var. rosae). In the first experiment, the oils: rapeseed, sunflower, Atpolan 80 EC, and Sunspray 850 EC at concentrations of 0.25%, 0.5%, 1.0% and 2%, used for spraying rose shrubs twice, showed an effcacy from 52% (Sunspray 850 EC at 0.25%) to 100% (Atpolan 80 EC at 2%). In the remaining six experiments, the efficacy of the tested oils used at a conc. of 1% ranged from 76.4% (rapeseed oil) to 100%. However, it should be emphasized that the effectiveness of the various oils varied depending on the experiment and time of observation. The results of the experiments suggest a slightly higher efficacy of mineral oils in comparison with vegetable oils, although the data obtained are not always supported by statistical calculations.
The oils used in the experiments were not found to cause phytotoxicity to the rose varieties on which they were tested.

Keywords: control; rose; Sphaerotheca pannosa var. rosae; vegetable and mineral oils

Date published: 2017-09-18