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Diseases

Ascochyta blight

Ascochyta

Ascochyta blight is a group of fungal plant diseases characterized by the appearance of spots with punctate sporulation on leaves, stems, and pods. The disease significantly reduces seed germination and crop productivity, causing yield losses of up to 50% or more.

Mentioned in descriptions 821 varieties reference book.

Ascochyta blight manifests as spots of varying color — from light brown with a dark rim to dark brown with a depressed center. A characteristic diagnostic sign of the infection is the presence of small black dots in the center of the spots, called pycnidia. The infection affects the above-ground organs of plants, leading to thinning of seedlings, stem breakage, and underdevelopment of fruits.

The development of the pathogen depends on the presence of infection in the soil, on plant residues or seeds, as well as on environmental conditions. Optimal conditions for the fungus are high air humidity above 90% and a temperature range from +16 to +25°C. Factors contributing to the spread of the disease include prolonged rains, dense sowing, and excessive nitrogen nutrition, while temperatures above +30°C slow down or stop the development of the disease.

The assessment of variety resistance in variety trials is carried out on an artificial or provocative infection background created by irrigation and regulation of plant density. During the breeding process, the degree of organ damage, yield stability under different infection loads, and plant homeostaticity are analyzed, i.e., their genetic ability to maintain productivity when exposed to the pathogen and environmental stress factors.

Sources10

Breakdown by crop

Ascochyta blight of pea 114 Ascochyta blight of chickpea 46 Ascochyta blight of soybean 25 Ascochyta blight of fava bean 19 Ascochyta blight of fava bean 14 Ascochyta blight of faba bean 11 Ascochyta blight of cucumber 9 Ascochyta blight of bean 7 Ascochyta blight of melon 4 Ascochyta blight of lentil 4 Ascochyta blight of common vetch 3 Ascochyta blight of hairy vetch 3

Found in these crops

Pea 120 Chickpea 48 Soybean 25 Tick Bean 23 Broad bean 16 Horse bean 13 Cucumber 8 Common bean 8 Lentil 4 Common vetch 3 Hairy vetch 3 Sunflower 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.

Rubina

Terminated

Glycine max (L.) Merr. · Soybean

IT
1 record

MARATHON

Withdrawn

Cucumis sativus L. · Cucumber

DK
1 record

Damyr 4

Application submitted

Pisum sativum L. · Pea

UA
1 record

Dobrobut

Application submitted

Cicer arietinum L. · Chickpea

UA
1 record

Titus

Terminated

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record

Redos

Terminated

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record

Olga

Terminated

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record

Nadwiślański

Terminated

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record

Granit

Active

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record

Mont d’or

Terminated

Phaseolus vulgaris L. · Common bean

1 record

Afila SC

Terminated

Pisum sativum L. · Pea

1 record

TIPU

Withdrawn

Pisum sativum L. · Pea

DK
1 record

PEARL

Withdrawn

Pisum sativum L. · Pea

DK
1 record

Isz 10

Terminated

Glycine max (L.) Merr. · Soybean

SK
1 record

Damyr 3

Application submitted

Pisum sativum L. · Pea

UA
1 record

GL Lucia

Active

Vicia faba L. var. minuta (hort. ex Alef.) Mansf. · Tick Bean

1 record