Diseases

Phoma rot

Phoma

Phoma rot is a group of fungal diseases manifesting as dry rots, stem necroses, and the appearance of characteristic black pycnidia dots. The disease affects a wide range of crops, causing significant yield losses both in the field and during storage.

Mentioned in descriptions 3 836 varieties reference book.

The disease manifests as the appearance of light brown to dark brown spots on leaves and stems, which can spread and infect the entire plant. Black dots, representing fungal pycnidia, form on the affected tissue areas, while depressed ulcers with a crumbling internal structure form upon infection of root crops and tubers.

The development of the pathogen depends on temperature conditions in the range of +10…+25°C and high air humidity exceeding 70–80%. The infection persists in the soil on plant debris for up to 3–6 years and is also transmitted through infected seeds, tubers, and root crops, which determines a high risk of spread in various climatic zones.

The assessment of variety resistance is carried out within the state variety testing system on specialized plots over several years. In field conditions, specialists conduct a visual scoring of plant infestation, which allows determining varietal responsiveness to the pathogen as an important economic and biological trait.

Varietal resistance to Phoma rot rarely constitutes full immunity and is considered an element of an integrated approach to crop protection. The selection of a resistant variety must be combined with adherence to crop rotation, returning the crop to the same field no earlier than after 3–4 years, and the use of healthy seed material.

Sources10

Breakdown by crop

Phoma stem canker of oilseed rape 529 Phoma black stem of sunflower 479 Phoma stem canker of rapeseed 215 Potato gangrene 12 Phoma Leaf Spot — Table Beet 3 Phoma rot of carrot 3 Phoma stem canker — white mustard 3

Found in these crops

Rapeseed 537 Sunflower 473 Rapeseed 213 Potato 12 Lemon 8 Onion 6 Garden beet 4 White mustard 3 Onion 2 Alfalfa 2 Maize 2 Sugar beet 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.

Acapulco

Active

Brassica napus L. · Rapeseed

Reinhard Hemker

SK UA

3 records

7009 R

Active

Terminated

Helianthus annuus L. · Sunflower

Syngenta Crop Protection AG

3 records

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Diseases

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.