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

Seddigh, Samin, Kiani, Leila
International journal of pest management 2018 v.64 no.2 pp. 178-184
Podosphaera pannosa, compost extracts, disease control, foliar diseases, greenhouses, powdery mildew, Iran
Powdery mildew (Sphaerotheca pannosa var. rosae) is an important foliar disease which is found in all rose-producing greenhouses. An experiment was carried out in a commercial greenhouse in Hashtgerd, Iran, in 2014 to investigate whether compost teas can be used to control this disease. Taguchi's design of experiment (Taguchi's DOE) method was used to plan a minimum number of experiments and optimization to control rose powdery mildew. The test included three factors, namely the different types of compost tea (aerated and non-aerated compost tea, aerated and non-aerated vermicompost tea), the dosage (1:8 and 1:16, compost:water), and the number of spray applications (once and twice per week). The experiment was set up as an orthogonal array L₈ with three replicates. Based on the experimental results, the optimum treatment combination for controlling rose powdery mildew was found to be aerated compost tea with 1:8 dilution with an application of twice per week.