Diseases
Tomato Powdery Mildew
Solanum lycopersicum L.
A fungal disease of tomato, primarily caused by the pathogens Oidium neolycopersici and Leveillula taurica. It manifests as a white powdery coating on the leaves, reducing photosynthetic activity and the overall crop yield.
In the reference 12 varieties crop Tomato, where this is mentioned in the description.
The primary pathogen of tomato powdery mildew in modern greenhouses and open fields is Oidium neolycopersici, whereas Leveillula taurica is more frequently found in hot and arid climates. Infection begins with the appearance of small, round spots of white mycelium on the leaves, which eventually coalesce, causing chlorosis, tissue necrosis, and premature leaf drop. The coating can also affect the plant stems and petioles.
In international practice, the codes On or Ol are used to denote resistance to the pathogen Oidium neolycopersici, and Lt for Leveillula taurica. Breeding programs for the development of high resistance (HR) or intermediate resistance (IR) varieties utilize wild species such as Solanum habrochaites, S. pennellii, S. cheesmaniae, S. chilense, and S. peruvianum, whose defense mechanisms are often based on the plant's hypersensitive response.
General information about the subject — on the page Powdery mildew.
Varieties of Tomato mentioned in the description
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