Eucalypt plays an important role in Brazilian forestry because of its good adaptation, fast growth, high productivity, as well as a lot of good qualities for industry. Eucalyptus reforestation needs a continuous production of seedlings, which can be attacked by Oidium sp. The control of powdery mildew is based on fungicides, but for eucalypts there are no products commercially registered. The objective of this work was to evaluate chemical products, essential oils, plants extracts, milk and dairy products and antagonist for the alternative control of this disease. Seedlings of E. benthamii Maiden & Cambage were used in the assays. Disease severity was assessed using a scale varying from 0 (no symptoms) to 4 (severe symptoms) and calculated the area under progress disease curve (AUDPC). It was verified that the lowest AUDPC values of powdery mildew were obtained with piraclostrobin + epoxyconazol, and cow milk and Lecanicillium sp. were the best alternative products.
alternative control; Eucalyptus benthamii; Oidium sp
