Diseases
Oryza sativa L.
A fungal disease of rice that appears in the second half of the growing season as narrow linear lesions on leaves, necrosis of leaf sheaths, and infection of the panicles. The causal agent is the pathogen Cercospora janseana.
In the reference 3 varieties crop Rice, where this is mentioned in the description.
The causal agent of the disease is the fungus Cercospora janseana, which has a complex population structure, including more than 40 identified races. The disease affects the above-ground organs of the plant, including leaf blades, leaf sheaths, peduncles, and glumes, appearing most actively after the booting stage.
Symptoms include narrow linear leaf spotting with brown lesions 2–10 mm in size, arranged parallel to the veins, as well as net necrosis of the leaf sheaths and panicle blight. The presence of fungal growth on the underside of the leaf during humid weather indicates conidial sporulation of the pathogen, which leads to panicle breakage and a decrease in grain quality.
Breeding for resistance to rice Cercospora leaf spot is complicated by the high variability of the fungus. Unlike other rice diseases, Cercospora leaf spot is not characterized by the widespread use of specific cloned resistance genes; therefore, breeding programs prioritize horizontal resistance and the evaluation of cultivars based on their actual degree of susceptibility.
General information about the subject — on the page Cercospora leaf spot.
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.