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Diseases

Citrus Alternaria Brown Spot

Citrus L.

A group of citrus diseases caused by the fungi Alternaria alternata and Alternaria citri, manifesting as brown spotting on shoots and fruit or latent black rot inside the fruit.

In the reference 13 varieties crop Citrus, where this is mentioned in the description.

The pathogen is Alternaria alternata, which is divided into pathotypes that differ in their production of host-specific toxins. The 'tangerine' pathotype affects mandarins and their hybrids, causing brown spot, while the 'rough lemon' pathotype affects lemon and Rangpur lime. The specific species Alternaria limicola occurs on lime.

Symptoms of brown spot include small dark lesions with chlorotic halos on leaves, leading to leaf drop and shoot necrosis. Fruit infection appears as dark, sunken, corky lesions. Black rot, which develops primarily post-harvest, affects the internal tissues of the fruit and often remains invisible from the outside.

In citrus breeding, resistance to Alternaria is considered a qualitative trait, with specific genetic markers in varieties being poorly defined. The resistance of varieties such as the Satsuma group is determined by traditional breeding methods without the use of standardized gene codes.

General information about the subject — on the page Alternaria blight.

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.

Belabela

Active

Citrus L. · Citrus

Frutas Beltran S.L.

7 records

Leanri

Active

Citrus L. · Citrus

VELDMAN, Frederik Johannes ESSELEN, Leon Leipold

11 records

Safor

Active

Citrus L. · Citrus

Navarro Luis|Valencia, ES / Juarez Jose|Valencia, ES / Aleza Pablo|Valencia, ES / Cuenca Jose|Valencia, ES / Julve Jose Manuel|Valencia, ES / Pina Jose Antonio|Valencia, ES

7 records

Orri

Active

Citrus L. · Citrus

Vardi Aliza

6 records

Mandanova SL

Active

Citrus L. · Citrus

THE AGRICULTURAL RESEARCH

4 records

Mor

Active

Citrus L. · Citrus

Vardi Aliza

ES
3 records

DANIT

Active

Citrus L. · Citrus

THE STATE OF ISRAEL-MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT-AGRICULTURAL RESEARCH ORGANIZATION( ARO)

3 records

YIFAT

Active

Citrus L. · Citrus

THE STATE OF ISRAEL-MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT-AGRICULTURAL RESEARCH ORGANIZATION( ARO)

3 records

RHM

Active

Citrus L. · Citrus

Royal Honey Pty Ltd ATF Royal Honey IP Trust

4 records

Garbí

Active

Citrus L. · Citrus

Navarro Luis|Valencia, ES / Juarez Jose|Valencia, ES / Aleza Pablo|Valencia, ES / Cuenca Jose|Valencia, ES / Julve Jose Manuel|Valencia, ES / Pina Jose Antonio|Valencia, ES

6 records

Spring Sunshine

Active

Citrus L. · Citrus

Pinchas Spiegel-Roy^^^Avraham Elhanati^^^Aliza Vardi

3 records

Alborea

Active

Citrus L. · Citrus

VARIOS OBTENTORES

6 records

QUEEN

Active

Citrus L. · Citrus

ANGEL TERESA HERMANOS, SA

3 records

ARCCIT1614

Active

Citrus L. · Citrus

Agricultural Research Council (ARC)

ES
3 records

OMET

Active

Citrus L. · Citrus

IVIA

1 record

Murina

Active

Citrus L. · Citrus

Salvador Zaragoza Adriaensens^^^José Luis Pardo Pascual

5 records

VERA

Active

Citrus L. · Citrus

IVIA-LNL-PAG-JCI-JJR-JPL-COC-ANL

1 record

MONCALINA

Active

Citrus L. · Citrus

VARIOS OBTENTORES

2 records

FREMONT

Active

Citrus L. · Citrus

1 record

FORTUNE

Active

Citrus L. · Citrus

5 records

MURCOTT

Active

Citrus L. · Citrus

3 records