Evaluation of different types of compost tea to control rose powdery mildew (Sphaerotheca pannosa var. rosae)
International Journal of Pest Management
Those Iranian scientists have done it again, showing aerated compost tea works great as a fungicide, especially at a 1:8 dilution, sprayed twice weekly. A simple experiment was set up on red roses that were infected with powder mildew. The scientists used several combinations of variables: Aerated vs. Non-Aerated tea, Compost versus Vermicompost Tea, Dilution strength 1:8 vs. 1:16, and weekly vs. biweekly sprays.
The roses were allowed to grow, and the numbers of infected leaves were counted and used to calculate damage rates. It was found that Aerated Compost Tea sprayed 2 times weekly, at a dilution rate of 1 gallon of tea to 8 gallons of water, was the most effective at suppressing the growth of powdery mildew. This research points us every closer to an exactness we can use to better our day to day gardening experience. Thanks Iranian scientists!!!