Escala diagramática e reação diferencial de clones para oídio do eucalipto

Abstract

In order to assess the severity of powdery mildew on leaves of eucalyptus, was developed and validated a diagrammatic scale with the following notes and levels of severity: note 1-0 % ; note 2-0,1 to 1,5% ; note 3-1,6 to 3,0% ; note 4-3,1 to 6,0% ; note 5- 6,1 to 12,0% ; note 6-12,1 to 25% ; note 7-25,1 to 50%. With use the scale improved the accuracy of the evaluators and provided high repeatability and reproducibility of the assessments of the severity of this disease. The scale developed and validated was used to determine the severity of powdery mildew in seedlings of different clones of eucalyptus. With this scale was possible to describe the differences among clones to powdery mildew. The 1528 clone, had the lower incidence and severity of this in greenhouse.