Arctic Queen
ActiveChrysanthemum L. · Chrysanthemum
JOS KESTER
Diseases
Alternaria blight
Alternaria
Alternaria blight is a complex of fungal diseases characterized by the appearance of dark spots with concentric zonation on plant organs. The disease leads to tissue necrosis, a reduction in photosynthetic activity, and significant yield losses.
Mentioned in descriptions 2 812 varieties reference book.
Alternaria blight manifests as dark, brown, or black spots that often have a characteristic concentric pattern resembling a target. On leaves, the spots eventually coalesce, causing necrosis, while on stems and fruits, depressed areas form, which, in conditions of high humidity, are accompanied by a velvety olive-colored sporulation coating.
Disease development is most intense at temperatures from +20 to +30°C and high air humidity, including the presence of free moisture. The risk of infection increases significantly with dense planting, mechanical tissue damage, and mineral nutrient deficiencies, as the pathogens often act as a secondary infection attacking weakened plants.
Varietal resistance to Alternaria blight is achieved through a combination of passive barriers, such as tissue structure features, and active responses, such as hypersensitivity, which blocks pathogen development. Resistance evaluation of varieties in breeding is conducted through field trials on natural infestation sites and provocation methods using artificial inoculation, which allows for the differentiation of varieties by the degree of infection.
Breakdown by crop
Tomato Early Blight
220
Alternaria Leaf Blight of Carrot
185
Alternaria blight of oilseed rape
108
Potato early blight
86
Alternaria Leaf Spot of Sunflower
61
Alternaria Leaf Spot of Rapeseed
49
Alternaria Brown Spot of Mandarin
22
Alternaria Leaf Spot — White Cabbage
19
Citrus Alternaria Brown Spot
13
Alternaria Leaf Blight of Leek
13
Alternaria Leaf Spot of Broccoli
12
Alternaria Blight of Pepper
11
Tomato Early Blight
9
Alternaria Leaf Spot of White Mustard
7
Alternaria Leaf Blight of Onion
6
Alternaria Leaf Spot — Cauliflower
6
Alternaria Blotch of Apple
6
Tobacco Alternaria Leaf Spot
5
Alternaria blight of Zinnia x marylandica
5
Alternaria Leaf Blight of Melon
4
Alternaria Leaf Spot of Savoy Cabbage
4
Alternaria Leaf Spot — Oilseed Radish
3
Alternaria Leaf Blight of Watermelon
3
Alternaria Leaf Spot — Red Cabbage
3
Found in these crops
Varieties that feature this in their description
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Factor KWS
Protection expiredBrassica napus L. · Rapeseed
KWS SAAT SE & CO.KGAA
AT
BG
HU
LT
SK
6 records
Kronos
ActiveBrassica oleracea L. (White Cabbage Group) · White cabbage
Seminis Vegetable Seeds
CZ
NL
PL
SK
UA
6 records
Crazy CL
ActiveBrassica napus var. napus · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
DE
PL
UA
10 records
ES Ellenis
ActiveHelianthus annuus L. · Sunflower
LIDEA FRANCE SAS
BG
IT
SK
UA
7 records
Match
ActiveDaucus carota L. · Carrot
HM.CLAUSE
FR
6 records
Goldimi
ActiveHelianthus annuus L. · Sunflower
Quality Crops Agro, RO
RO
7 records
Sympathie
Protection expiredSolanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
FR
NL
PL
SK
5 records
Herakles
ActiveBrassica napus L. · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
AT
EE
LT
SK
UA
6 records
Cezanne
ActiveBrassica napus var. napus · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
DK
FR
UA
7 records
KWS Granos
ActiveBrassica napus L. · Rapeseed
KWS Saat SE, Einbeck DE
AT
HU
LV
RO
5 records
Floriset
Protection expiredSolanum lycopersicum L. · Tomato
ROYAL SLUIS
CZ
NL
PL
SK
5 records
Supporter SU
ActiveHelianthus annuus L. · Sunflower
Jean Pierre Dufourcq
BG
IT
UA
5 records
ES Averon SU
ActiveHelianthus annuus L. · Sunflower
Olivier Soulie
BG
IT
UA
7 records
ES Proxima
ActiveHelianthus annuus L. · Sunflower
Euralis Semences
BG
IT
UA
6 records
ES Slava
ActiveHelianthus annuus L. · Sunflower
Olivier Soulie
BG
SK
UA
6 records
Sabina
Protection expiredCarthamus tinctorius L. · Safflower
Dr. Jan Hofbauer / Ing. Jan Pelikan / Jarmila Groligova
CZ
DE
SK
6 records
Nelix
ActiveDaucus carota L. · Carrot
Bejo Zaden BV (NL)
HR
NL
PL
5 records
Mika
TerminatedBrassica napus var. napus · Rapeseed
KWS| KWS SAAT AG
DE
DK
PL
7 records
Iwakami
ActiveMalus domestica (Suckow) Borkh. · Apple
Y Yoshida, S Tsuchiya, S Sadamori, H Murakami, S Ishizuka (JP)
DE
FR
NL
7 records
Kira
ActiveCicer arietinum L. · Chickpea
Werner Horn
BG
HU
UA
6 records
KWS Vamos
ActiveBrassica napus var. napus · Rapeseed
KWS SAAT SE & CO.KGAA
DE
DK
UA
10 records
Jumper
ActiveAllium porrum L. · Leek
Ger Beemsterboer
HR
NL
UA
6 records
Fancy
ActiveDaucus carota L. · Carrot
L. Daehnfeldt A/S
CZ
PL
SK
5 records