El-Refaei, M. I. <br/><br/>
Biological control of powdery mildew disease on marigold (Calendula officinalis L.) at Fayoum  [electronic resource]. 
 المقاومة البيولوجية لمرض البياض الدقيقي فى نبات الأقحوان. 

 - p.151-159. 
<br/><br/>Includes references. 
<br/><br/> Marigold (Calendula officinalis L.) is one of the important economically crops, which belongs to family Astraceac. Marigold represents one of the most important and economic ornamental crops in the Arab Republic of Egypt. The economic importance of this crop appears in both local consumption and exportation purposes. Cultivated area of marigold in 2005 growing season reached about 550 Fadden in open fields, which yielded 9397 ton flowers. Several disease attacked marigold plants in all growing stages as powdery mildew. The Present work was designed to solve a part of this dilemma and control this disease by non-chemical methods.  Key words: Disease, Biological Control, Powdery Mildew, Marigold. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marigolds--Diseases and pests--Biological control.<br/>Powdery mildew diseases.