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ROSE LEAF SPOT DISEASES CAUSED BY FUNGI

 BLACK SPOT

RUST

DOWNY MILDEW

SPOT ANTHRACNOSE

POWDERY MILDEW

Characteristic black spots develop on the upper leaf surfaces. Leaf spots are usually circular with characteristic fringed borders. Raised purple-red, irregular blotches may develop on young canes of susceptible varieties.

The powdery pustules of orange to orange-red spores (aeciospores / uredospores) on the undersides of the leaves in mid spring through fall are very diagnostic. Black pustules containing teliospores may be present during the winter months. This fungus is an obligate parasite.

This fungus is characterized by purplish to black areas on leaves, stems, and peduncles. This is followed by yellowing of the leaflets and complete defoliation of the plant. The fungal mycelia are intercellular in rose tissue. This fungus is an obligate parasite.

This fungus is characterized by purplish to black areas on leaves, stems, and peduncles. This is followed by yellowing of the leaflets and complete defoliation of the plant. The fungal mycelia are intercellular in rose tissue. This fungus is an obligate parasite.

The white growth of the fungus consists of mycelium and conidiophores and appears as patches on leaves and stems. Young tissue is most susceptible. This is an obligate parasite.



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Copyright© 1995-2002 by Baldo Villegas
Last updated: January 21, 2002