Abstract
ABSTRACTPowdery 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.
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