BIOLOGICAL CONTROL OF POWDERY MILDEW DISEASE ON MARIGOLD (Calendula officinalis L.) AT FAYOUM

Document Type : Research articles.

Authors

1 Botany Department, Faculty of Agriculture, Fayoum University.

2 Plant Pathology Institute, Agricultural Research Center.

Abstract

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.
The present investigation aimed at studying the effect of bio
control agents in controlling marigold powdery mildew.
Different microorganisms were isolated from phylloplane of
healthy marigold plant and used as antagonists against different
pathogens. Trichoderma harziamum and Bacillus subtilis were the
most effective antagonists against all tested pathogens as well as
increasing the average number of flowers/plant and average
weight of flowers/plant One week interval was the best time for
using both organisms as antagonists.

Keywords

Fayoum Journal of Agricultural Research and Development
Volume 23, Issue 1
January 2009
Pages 151-159

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