Zinnia Flower Diseases. Single petaled varieties contain a solitary row of petals that leave the center of the flower visible. Aphids are common insects that damage zinnias when they puncture the leaves and stem to feed on the sap or juice of the plant says the University of Illinois Extension.
Jan 07 2018. 11 rows Nov 09 2020 Powdery Mildew. Powdery mildew is a fungal disease Golovinomyces cichoracearum that appears.
Powdery mildew is a fungal disease distinguished by the occurrence of a grayish-white powder similar to wood ash on the foliage of the plants.
They are about 8 inches tall. Oct 12 2009 on Oct 12 2009 Zinnias are rarely attacked by insects. Alternaria blight Alternaria zinniae powdery mildew Golovinomyces cichoracearum formerly Erysiphe cichoracearum and bacterial leaf spot Xanthomonas campestris pv. Single petaled varieties contain a solitary row of petals that leave the center of the flower visible.