Effect of Powdery Mildew Disease on  Silybum marianum Plant and  Their Chemical Control

.Y. Al-Gorany, Ramadhan

	Effect of Powdery Mildew Disease on Silybum marianum Plant and Their Chemical Control
Tikrit Journal of Pure Science
Article 1, Volume 13, Issue 2, 2008, Pages 235-241
Author
Ramadhan .Y. Al-Gorany
Abstract
The infection of Milk thistle (Silybum marianum) with powdery mildew resulted in the reduction of the average weight of 100 seeds in the field to 2.14 gm and in the green house to 0.75 gm, compared to the seeds of uninfected plants 2.29 gm. The infection also resulted in a reduction in raw fat rate to 12.8 % in the seeds of infected plants in the green house and 19.8 % in the seeds of infected plants in the field, in comparison with the seeds of the uninfected plants 25.8 %. S. marianum plants were sprinkled by five types of fungicides(Atemi, Bavistin, Benlite, Bravo and Tobas).The fungicides resulted in a reduction in the infection intensity with powdery mildew. The best of which was Bravo (0.98) which also caused increase in the wet weight average (8.13 gm), the dry weight average (2.8 gm) and seeds weight average (1.06 gm). Sprinkling the plants 4 times in a period of 10 days between each lead to a reduction in the infection intensity average to 1.42, wet weight average (9.0 gm), dry weight average (3.16 gm) and seeds weight average (1.03 gm).
Keywords
Powdery mildew; Fungicides

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