Diseases

Bacterial diseases

Pseudomonas, Xanthomonas, Pectobacterium, Ralstonia, Clavibacter, Agrobacterium, Bacillus, Streptomyces

Bacterial diseases are plant diseases caused by non-spore-forming rod-shaped bacteria, manifesting as rots, spots, and wilting. Due to diagnostic complexity and high pathogen variability, the selection of resistant varieties is the primary method for reducing yield losses.

Mentioned in descriptions 5 044 varieties reference book.

Bacterial diseases represent a group of disorders caused by pathogenic bacteria that enter plant tissues through stomata, natural openings, or mechanical injuries. External symptoms include soft and root rots, blights, wilting, and specific spotting with a yellow halo. Symptoms often mimic mineral deficiency, complicating visual diagnosis.

Pathogen development depends directly on environmental conditions, primarily the presence of free moisture and air temperatures in the range of 25–30 °C. High infection intensity can lead to significant crop losses, and in epiphytotic years, to total crop failure, making the analysis of varietal resistance a key element of agronomic strategy.

The evaluation of varietal resistance in variety trials is conducted visually based on the area of affected organs or by using an artificial inoculation background, where plants are infected with controlled strains. Resistant varieties exhibit a hypersensitive response — rapid tissue necrosis at the site of pathogen entry, which limits the spread of infection within the plant.

The efficacy of varietal protection depends on the specificity of the variety to particular races or strains of the pathogen. Agronomists are advised to account for the high genetic variability of bacteria, due to which varietal resistance may change over time, and to pay attention to verified data on resistance to local pathogen populations.

Sources10

Breakdown by crop

Fire blight of apple 398 Fire Blight of Pear 285 Bacterial Diseases of Common Bean 215 Bacterial diseases of cabbage 127 Fire Blight of Apple 119 Bacterial blight of walnut 83 Tomato bacterioses 69 Bacterial Diseases of Soybean 67 Bacterial diseases of sweet corn 41 Bacterial diseases of maize 33 Bacterial angular leaf spot of cucumber 30 Fire blight of quince 28 Bacterial Spot of Pepper 28 Bacterial diseases — cauliflower 24 Bacterial Diseases of Alfalfa 22 Bacterial diseases of oilseed rape 21 Bacteriosis — Italian ryegrass 19 Bacterial Diseases of Pear 15 Bacterial Canker of Sour Cherry 15 Bacterial Blight of Pea 14 Bacterial blight of hazelnut 14 Bacterial Wilt of Italian Ryegrass 13 Bacterioses of perennial ryegrass 13 Bacterial diseases of maize 13

Found in these crops

Common bean 200 Persian walnut 76 Soybean 67 Tomato 66 White cabbage 54 Sweet corn 41 Maize 32 Alfalfa 30 Cucumber 28 Bell pepper 24 Rapeseed 20 Italian ryegrass 19

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.

Troubadour

Terminated

Phaseolus vulgaris L. · Common bean

2 records

Tough Boy

Terminated

Solanum lycopersicum L. · Tomato

2 records

Unival

Active

Juglans regia L. · Persian walnut

2 records

Valcris

Active

Juglans regia L. · Persian walnut

3 records

Snow Lady

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

2 records

Verisval

Active

Juglans regia L. · Persian walnut

2 records

Valrex

Active

Juglans regia L. · Persian walnut

2 records

Tizenegyes

Active

Capsicum annuum L. · Bell pepper

2 records

Tonda Romana

Active

Corylus avellana L. · Common hazel

3 records

SS 40302

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

2 records

Taberna

Terminated

Brassica oleracea L. (Cauliflower Group) · Cauliflower

2 records

SW7408

Active

Medicago sativa L. · Alfalfa

2 records

Szalva

Active

Capsicum annuum L. · Bell pepper

2 records

Sadabahar

Active

Capsicum annuum L. · Bell pepper

2 records

Primetime

Protection expired

Zea mays L. subsp. mays (Sweet Corn Group) · Sweet corn

2 records

PR37F81

Active

Zea mays L. · Maize

2 records

Siokra

Terminated

Gossypium L. · Cotton

2 records

Romaine

Active

Juglans regia L. · Persian walnut

2 records

Sava

Active

Juglans regia L. · Persian walnut

2 records

Seifersdorfer

Active

Juglans regia L. · Persian walnut

2 records

Rubi

Active

Solanum lycopersicum L. · Tomato

2 records

Romantela

Active

Corylus avellana L. · Common hazel

2 records

Palla di neve

Active

Brassica rapa L. var. rapa (L.) Thell. · Turnip

2 records

Redval

Active

Juglans regia L. · Persian walnut

3 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064

All terms →

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.