Diseases
Citrus reticulata Blanco
A fungal disease of mandarin known as Alternaria brown spot, caused by a specialized pathotype of Alternaria alternata, which infects young leaves, shoots, and fruit through the production of host-specific toxins.
In the reference 22 varieties crop Mandarin orange, where this is mentioned in the description.
The causative agent of the disease is the fungus Alternaria alternata (Fr.) Keissler, which in the context of infecting mandarins and their hybrids is classified as pathotype pv. citri. The pathogenicity of this strain is due to the secretion of specific toxins, without which the development of disease symptoms on susceptible plants is impossible.
Characteristic signs of infection are small dark spots on young leaves, surrounded by a distinct chlorotic halo, which, as necrosis develops, leads to deformation and shedding of the foliage. On fruit, the disease manifests as depressed dark spots, and on young shoots as necrotic areas that serve as a source for further spread of the infection.
In breeding programs, disease resistance is evaluated as a quantitative trait associated with quantitative trait loci (QTL) mapping, rather than through individual resistance genes. Varietal differences in the degree of susceptibility to this spotting are a key factor in genetic research for the development of new hybrids.
General information about the subject — on the page Alternaria blight.
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.
Citrus reticulata Blanco · Mandarin orange
George Diederick Janse van Resburg
Citrus reticulata Blanco · Mandarin orange
George Diederick Janse van Resburg
Citrus reticulata Blanco · Mandarin orange
Gmitter, JR. Frederick G.
Citrus reticulata Blanco · Mandarin orange
THOMAS McCALLUM/JACK HEARN
Citrus reticulata Blanco · Mandarin orange
VARDI, ALIZA SPIEGEL-ROY, P. ELCHANATI, A. FRIEDMAN, AHUVA NOYMAN, CHANA
Citrus reticulata Blanco · Mandarin orange
Nir Carmi^^^Hanna Neuman-Leshem^^^Ahuva Frydman-Shani^^^Pinchas Spiegel-Roy^^^Aliza Vardi^^^Avraham Elhanati^^^Yosef Yaniv^^^Yeoshua Kanonich
Citrus reticulata Blanco · Mandarin orange
Thomas G. Mc Collum Jack Hearn
Citrus reticulata Blanco · Mandarin orange
Nir Carmi/Yosef Yaniv/Ahuva Frydman-Shani/Aliza Vardi/Avraham Elhanati/Kanonich Yeoshua,/Luba Fanberstein
Citrus reticulata Blanco · Mandarin orange
Yosef Yaniv^^^Yeoshua Kanonich^^^Tal Amit^^^Nir Carmi
Citrus reticulata Blanco · Mandarin orange
IVIA
Citrus reticulata Blanco · Mandarin orange
Nir Carmi^^^Yoram Eyal^^^Hanna Neuman-Leshem^^^Ahuva Frydman-Shani^^^Aliza Vardi^^^Avraham Elhanati^^^Yosef Yaniv^^^Yeoshua Kanonich^^^Luba Fanberstein
Citrus reticulata Blanco · Mandarin orange
Gmitter, JR. Frederick G.
Citrus reticulata Blanco · Mandarin orange
IVIA
Citrus reticulata Blanco · Mandarin orange
Citrus reticulata Blanco · Mandarin orange
THE AGRICULTURAL RESEARCH
Citrus reticulata Blanco · Mandarin orange
IVIA/AVASA
Citrus reticulata Blanco · Mandarin orange
IVIA
Citrus reticulata Blanco · Mandarin orange
VARIOS OBTENTORES
Citrus reticulata Blanco · Mandarin orange
IVIA-LNL-PAG-JCI-JJR-JPL-COC-ANL
Citrus reticulata Blanco · Mandarin orange
IVIA
Citrus reticulata Blanco · Mandarin orange
STARRANTINO ANGELO
Citrus reticulata Blanco · Mandarin orange
VARIOS OBTENTORES
Citrus reticulata Blanco · Mandarin orange