Diseases

Cercospora leaf spot

Cercospora beticola

Cercospora leaf spot is a fungal plant disease that causes leaf spotting, necrosis, and a significant yield reduction due to the disruption of photosynthesis.

Mentioned in descriptions 2 072 varieties reference book.

The disease manifests as small circular spots measuring 2–5 mm, light brown or grayish in color with a characteristic purple or reddish-brown border. Under high humidity, a velvety coating, representing the fungus's sporulation, forms in the center of the affected areas. Subsequently, the spots coalesce, causing yellowing, necrosis, and premature death of the leaf blade, which forces the plant to expend stored nutrients on foliage regeneration.

The development of the pathogen depends on weather conditions, requiring temperatures in the range of +20 °C to +30 °C and a high relative humidity above 70–90%. The presence of free moisture on the leaf surface is critical for the fungus to penetrate through the stomata. The infection persists in the soil on plant debris as mycelium and can be transmitted via seed material.

Evaluation of the resistance of varieties and hybrids is conducted during variety trials based on a visual method, where the degree of infestation is recorded as a percentage of the leaf area or on multi-point scales. Experts use phytomonitoring and regular surveys to determine the infection spread dynamics. Based on the observation results, samples are ranked by resistance groups, which helps agronomists select hybrids capable of maintaining a healthy leaf apparatus until the end of the vegetation period.

Sources10

Breakdown by crop

Cercospora Leaf Spot — Sugar Beet 484 Cercospora Leaf Blight of Carrot 64 Cercospora Leaf Spot of Table Beet 52 Cercospora Leaf Spot — Fodder Beet 24 Cercospora Leaf Spot of Beet 16 Cercospora Leaf Spot of Swiss Chard 6 Cercospora leaf spot of soybean 5 Cercospora leaf spot of crapemyrtle 5 Rice Cercospora Leaf Spot 3

Found in these crops

Sugar beet 499 Carrot 68 Garden beet 52 Mangelwurzel 24 Beet 16 Swiss chard 7 Crape Myrtle 6 Soybean 4 Rice 3 Maize 3 Tall fescue 2 Bigleaf hydrangea 2

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.

Bordo 237

Active

Beta vulgaris Garden Beet Group · Garden beet

Sortsemovošč

CZ LT UA

7 records

Taunus

Active

Beta vulgaris Garden Beet Group · Garden beet

Bejo Zaden, NL

HR NL

7 records

Florance

Active

Daucus carota L. · Carrot

Robert Oostveen, Nunhems B.V.

NL UA

11 records

Cadance

Active

Daucus carota L. · Carrot

Paul Degreef

NL UA

13 records

Baltimore

Active

Daucus carota L. · Carrot

Bejo Zaden B.V.

NL UA

9 records

Bettollo

Active

Beta vulgaris Garden Beet Group · Garden beet

Ger Beemsterboer

NL UA

7 records