Diseases
Chrysanthemum L.
A quarantine disease of chrysanthemums caused by the highly specialized fungus Puccinia horiana. It is characterized by the appearance of specific light-green spots on leaves followed by the formation of distinctive white pustules.
In the reference 59 varieties crop Chrysanthemum, where this is mentioned in the description.
The causative agent of the disease is the microcyclic fungus Puccinia horiana Henn., which parasitizes exclusively on plants of the genus Chrysanthemum and some closely related genera, without requiring an intermediate host. Primary symptoms appear as pale yellow spots on young leaves, which subsequently become depressed and take on a light-brown hue.
Convex, waxy telia, changing color from pink to white, form on the underside of the leaves. Severe infection causes premature tissue necrosis and leaf curling, giving the plant a scorched appearance. In immune cultivars, brown spots may form at the site of pathogen penetration.
Chrysanthemum resistance to this infection is predominantly monogenic and controlled by specific R-genes. In breeding programs, the PDI disease index and molecular markers, including the CmWRKY15-1 and CmCC-NB-ARC genes associated with plant defense mechanisms, are used to evaluate cultivar susceptibility.
General information about the subject — on the page Rust.
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.
Chrysanthemum L. · Chrysanthemum
Vandenberg Cornelis P.|Salinas, CA
Chrysanthemum L. · Chrysanthemum
Knaap, Jacques C. M. Van der|De Lier, Netherlands
Chrysanthemum L. · Chrysanthemum
Knaap, Jacques C. M. Van der|De Lier, Netherlands
Chrysanthemum L. · Chrysanthemum
Vandenberg Cornelis P
Chrysanthemum L. · Chrysanthemum
WALTER H. JESSEL, JR. & WILLIAM E. DUFFETT
Chrysanthemum L. · Chrysanthemum
Arie Gerard Post
Chrysanthemum L. · Chrysanthemum
Chrysanthemum Breeders Association Research B.V.
Chrysanthemum L. · Chrysanthemum
Lintott, Keith|Bognor Regis, England
Chrysanthemum L. · Chrysanthemum
WILLIAM E DUFFETT
Chrysanthemum L. · Chrysanthemum
VAN DER KNAAP IR. J.
Chrysanthemum L. · Chrysanthemum
Chrysanthemum Breeders Association Research B.V.
Chrysanthemum L. · Chrysanthemum
Niklas, Edmund R / Jessel, Jr., Walter H.|Salinas, CA / Duffett, William E.|Salinas, CA
Chrysanthemum L. · Chrysanthemum
W JOHN LAYNG
Chrysanthemum L. · Chrysanthemum
REVECU BV
Chrysanthemum L. · Chrysanthemum
REVECU BV
Chrysanthemum L. · Chrysanthemum
SPARKES ALEC GRAHAM
Chrysanthemum L. · Chrysanthemum
FGB B.V.
Chrysanthemum L. · Chrysanthemum
Vandenberg Cornelis P.|Salinas, CA
Chrysanthemum L. · Chrysanthemum
Dümmen Group B.V.
Chrysanthemum L. · Chrysanthemum
Arie Gerard Post
Chrysanthemum L. · Chrysanthemum
FGB B.V.
Chrysanthemum L. · Chrysanthemum
A.G.P & M.P.M Vijverberg
Chrysanthemum L. · Chrysanthemum
PARATY B.V.B.A
Chrysanthemum L. · Chrysanthemum
Fides B.V.