Diseases

Citrus Scab

Citrus L.

A fungal disease of citrus caused by ascomycetes of the genus Elsinoë. It affects young leaves, shoots, and fruits, forming characteristic wart-like growths and deformities.

In the reference 5 varieties crop Citrus, where this is mentioned in the description.

The pathogens of the disease are the species Elsinoë fawcettii, which causes common scab, and Elsinoë australis, responsible for sweet orange scab. The disease manifests during the period of active tissue growth as raised wart-like excrescences, corky spots, or pustules, the color of which changes from light yellow to gray-brown as they mature.

Severe infestation leads to the deformation of leaves, which become asymmetrical and crinkled. Curvatures appear on the fruit, and the peel becomes coarse and thickened, which significantly reduces their commercial quality. The pathogens are characterized by the presence of pathotypes that differ in their host range and geographical distribution.

There is no universally accepted system for designating specific scab resistance genes in citrus. The degree of susceptibility of cultivars is determined during field trials, with many varieties of lemon, grapefruit, mandarin, and a number of common rootstocks showing high sensitivity to the pathogen.

General information about the subject — on the page Scab.

Sources8

Varieties of Citrus 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.