Evaluation of different types of compost tea to control rose powdery mildew (Sphaerotheca pannosa var. rosae)

December 13, 2017

Fresh compost tea data out of Iran!  A group of sagacious scientists evaluated several different types of compost tea and its effects on rose powdery mildew.  They made 4 different types of tea: 1. Aerated Compost Tea 2. Non-Aerated Compost Tea 3. Aerated Worm Casting Tea  4. Non-Aerated Worm Casting Tea.    They made these teas at two different strengths, a 1:8 and a 1:16 ratio of compost/castings to water.  The teas were either bubbled or non-bubbled for 10 days, and then used as a foliar spray on greenhouse grown roses  that were susceptible to powdery mildew.  Sprays were either made once per week, or every three days.  The scientists found that the 1:8 strength Aerated Compost Tea sprayed twice weekly, was the effective in controlling the powdery mildew. More proof that compost tea is well worth the effort if you are working to prevent and eradicate the deleterious effects of powdery mildew.  Thanks scientists from the other side of the globe!!!  Synopsis from Compost Tea Lab

Evaluation of different types of compost tea to control rose powdery mildew (Sphaerotheca pannosa var. rosae)
International Journal of Pest Managment
August 2017
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