Diseases

Powdery mildew — Zinnia x marylandica D. M. Spooner et al.

Zinnia x marylandica D. M. Spooner et al.

Powdery mildew on Zinnia x marylandica hybrids is caused by the fungus Golovinomyces cichoracearum. The crop possesses selectively fixed increased resistance to this pathogen compared to Zinnia elegans.

In the reference 12 varieties crop Zinnia x marylandica D. M. Spooner et al., where this is mentioned in the description.

The causative agent of the disease in Zinnia x marylandica is the obligate parasite Golovinomyces cichoracearum, which infects the aerial organs of the plant. Symptoms manifest as a whitish powdery coating on leaves, stems, and peduncles; however, when agricultural practices are followed, the development of the disease in this crop generally does not reach critical levels.

The resistance of Zinnia x marylandica to the pathogen is a complex characteristic obtained through hybridization with Z. angustifolia and is classified as natural tolerance. Currently, information regarding specific resistance genes or the division of the pathogen into specific races in relation to this crop is absent in open scientific publications.

General information about the subject — on the page Powdery mildew.

Sources4

Varieties of Zinnia x marylandica D. M. Spooner et al. mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.