Diseases
Powdery mildew of pepper
Capsicum annuum L.
A fungal disease of pepper caused by the endophytic fungus Leveillula taurica, which colonizes leaf mesophyll. It manifests as yellow spots, followed by the appearance of white mycelium and massive leaf drop.
In the reference 8 varieties crop Bell pepper, where this is mentioned in the description.
The causal agent of powdery mildew on pepper is the fungus Leveillula taurica (synonyms Erysiphe taurica, Oidiopsis taurica, Phyllactinia taurica). Unlike most pathogens of this group, the fungus develops endophytically rather than epiphytically, penetrating leaf tissues and colonizing the mesophyll.
Primary symptoms include the appearance of yellow or chlorotic spots on the upper side of the leaf, followed by the formation of white sporulation on the underside. Tissue necrosis leads to premature defoliation, which causes plant exposure and damage to fruits from sunscald.
Resistance of pepper to the pathogen is predominantly quantitative in nature and is designated in catalogs by the code Lt. Genetic control includes quantitative trait loci (QTLs) on chromosome 6, the PMR1 locus on chromosome 4, and genes of the Mlo family (CaMlo1, CaMlo2) associated with susceptibility.
General information about the subject — on the page Powdery mildew.
Varieties of Bell pepper mentioned in the description
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