Microscopic examination showed that Erysiphe cichoracaerum is the causal agent of Milk thistle powdery mildew and its symptoms begin to appear in the middle of March. Plants sprayed with Neem (5%) had no effect on the percentage of chlorophyll, but reduced the severity percentage infection to 2.2, 50.0% respectively. The use of different concentrations of salicylic acid (SA) acetylsalicylic acid (ASA) led to an increase in wet and dry weight and higher plants hieght. One spray with 1 mmole ASA increased the wet weight to10.9 g. In the meantime, the dry weight differed significantly from other treatments except of 1 mmole SA once spray.
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