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Diseases

Tomato Early Blight

Solanum lycopersicum L.

A fungal disease of tomatoes caused by Alternaria solani, characterized by the appearance of spots with concentric zonation on leaves, stems, and fruits. Variety resistance is primarily polygenic in nature.

In the reference 220 varieties crop Tomato, where this is mentioned in the description.

The primary pathogen of tomato early blight is the fungus Alternaria solani Sorauer; small-spored species such as Alternaria alternata and Alternaria tomatophila also occur. The disease affects all above-ground plant organs, manifesting on leaves as dark brown spots with distinct concentric zonation and a yellow halo. Elongated spots appear on stems and petioles, leading to cracking and tissue breakage, while fruit infection is most often localized in the peduncle area in the form of sunken, dry, dark spots.

Unlike a number of other tomato diseases, no clear dominant resistance genes used in standard variety coding descriptions have been identified for early blight. In international practice, the codes As (for Alternaria solani) and Aal (for Alternaria alternata f. sp. lycopersici) are used to denote resistance to the pathogen. Due to the polygenic nature of resistance, breeding programs typically assess the level of tolerance or the degree of plant susceptibility using scoring scales rather than the presence of specific genes.

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

Sources8

Varieties of Tomato 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.

Primadonna

Withdrawn

Solanum lycopersicum L. · Tomato

De Ruiter Zonen (HR)

FR
1 record

Popіl'nians'kyi

Terminated

Solanum lycopersicum L. · Tomato

Stril`nyk Halyna Vasylivna, Nedialkova Iiuliia Antonivna, Horkutsenko Oleksandr Vasyl`ovych, Kravchenko Vladyslav Andriiovych, Shotyk Mykola Vasyl`ovych,

UA
1 record

PINK SVITNES

Active

Solanum lycopersicum L. · Tomato

Sytnychenko Serhii Mykolaiovych

UA
2 records

Pink Girl F1

Terminated

Solanum lycopersicum L. · Tomato

Hari Besels

UA
1 record

Polbig F1

Active

Solanum lycopersicum L. · Tomato

Her Bimsdeboer

UA
1 record

Perfect MC3 F1

Terminated

Solanum lycopersicum L. · Tomato

Zuhair Bibi

UA
1 record

Mykolka F1

Terminated

Solanum lycopersicum L. · Tomato

Horkutsenko Oleksandr Vasyl`ovych, Nedialkova Iiuliia Antonivna, Stril`nyk Halyna Vasylivna, Shotyk Mykola Vasyl`ovych,

UA
1 record

Murastar

Application submitted

Solanum lycopersicum L. · Tomato

Sakata Seed Corporation, JP

FR
1 record

Monty F1

Active

Solanum lycopersicum L. · Tomato

Teresa Beck Bunn

UA
1 record

Millennium F1

Active

Solanum lycopersicum L. · Tomato

Boni Paolo

UA
2 records

Marissa F1

Terminated

Solanum lycopersicum L. · Tomato

Hari Besels

UA
1 record

Liona F1

Terminated

Solanum lycopersicum L. · Tomato

Mercier Jean-Claude

UA
1 record

Liubov F1

Application submitted

Solanum lycopersicum L. · Tomato

Panchev IUrii Ivanovych

UA
2 records

Katia F1

Terminated

Solanum lycopersicum L. · Tomato

Aleksieiev IUrii Borysovych

UA
2 records

Karas`

Terminated

Solanum lycopersicum L. · Tomato

Yeromenko Viktor Volodymyrovych, Kuz`omens`kyi Oleksandr Volodymyrovych, Kravchenko Vladyslav Andriiovych,

UA
1 record

Ivanovets` F1

Active

Solanum lycopersicum L. · Tomato

Vasyl`ieva Marharyta IUrivna, Dehovtsova Tetiana Volodymyrivna, Hladkov Dmytro Serhiiovych, Volok Ol`ha Anatoliivna, Amcheslavs`ka Olena Valentynivna, Moriev Viktor Vasyl`ovych, Havrysh Serhii Fedorovych,

UA
2 records

Imran

Terminated

Solanum lycopersicum L. · Tomato

Kees Konst

UA
2 records

Heinz 3402 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

Heinz 2206 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

Heinz 1015 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

Heinz 8504 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

UA
2 records

Florida 47

Protection expired

Solanum lycopersicum L. · Tomato

Wayne Fowler

BG
1 record