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Pest Management Decision Guide
1 November 2016

Bacterial Soft Rot on Carrots-Kenya: Pectobacterium carotovorum (previously called Erwinia carotovora);

Pest Management Decision Guides
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Pictures

Soft, watery, slimy rot on the taproot, which is grey to brown (Photo: Oregon State University)
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Severe pitting of carrot roots observed after the roots are harvested and washed (Photo:Lindsey du Toit, Washington State University)
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Rapid decay that consumes the core of the carrot, often leaving the epidermis intact (Photo: www.extension.umn.edu)
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Prevention

Plant carrots in well-drained soils, and water twice a week.
Rotate with legumes, soybeans and fodder grasses
Avoid injuring carrots when weeding or harvesting to prevent entry of pathogen
Control vectors that can wound carrots e.g. cabbage maggot - see yellow section.
Start working from the healthy field towards the infected area
Disinfect all farm tools in 10% jik solution (50 mls in 1 litre) of water for 5 minutes
Avoid harvesting carrots during wet conditions

Monitoring

Look out for:
*Soft, watery, slimy rot on the taproot, which is grey to brown with a foul smell
*Rapid decay that consumes the core of the carrot, often leaving the epidermis intact
*General yellowing, wilting and collapse of the foliage above ground
*Severe pitting of carrot roots observed after the roots are harvested and washed
Take action as soon as yellowing and wilting symptoms are seen on one plant

Direct Control

Remove and burn infected plants

Restrictions

Bacterial diseases have no known cure hence avoid the introducing the pathogen. Use of copper-based fungicides only suppress the pathogen.
When using a pesticide always wear protective equipment.
Follow the instructions on the product label, such as dosage, timing of application, max. number of sprays, restricted re-entry interval.
Always consult recent list of registered pesticides (PCPB).

Direct Control

Spray with copper-based fungicide e.g. copper oxychloride (Amicop 50WP or Cobox 50WP at 60g per 20L water). Repeat spray after 2 weeks. Maximum 2 sprays/season.

WHO Class II (Moderately Hazardous), PHI 7days, REI 12hrs. Toxic to aquatic organisms. WHO Class U (unlikely to cause any effects if used as required)
For control of cabbage maggot, drench with Azadirachtin-based products e.g. Nimbecidine EC or Achook EC at 50mls/20L of water

Indexing Terms

Descriptors

  1. arthropod pests
  2. azadirachtin
  3. bacterial diseases
  4. bacterial soft rot
  5. bactericides
  6. botanical insecticides
  7. burning
  8. cabbages
  9. carrots
  10. cauliflowers
  11. chemical control
  12. control
  13. copper
  14. copper fungicides
  15. copper oxychloride
  16. cucumbers
  17. cultural control
  18. disease control
  19. disease vectors
  20. drainage
  21. extension
  22. fungicides
  23. insect control
  24. insect pests
  25. insecticides
  26. irrigation
  27. kale
  28. monitoring
  29. pathogenicity
  30. pathogens
  31. pest control
  32. pest management
  33. pesticides
  34. pests
  35. plant disease control
  36. plant diseases
  37. plant pathogenic bacteria
  38. plant pathogens
  39. plant pests
  40. potatoes
  41. pumpkins
  42. rotations
  43. tomatoes
  44. vector control
  45. vectors

Organism Descriptors

  1. arthropods
  2. Bacteria
  3. Brassica
  4. Brassica oleracea
  5. Brassica oleracea var. botrytis
  6. Brassica oleracea var. capitata
  7. Brassica oleracea var. viridis
  8. Brassicaceae
  9. Cucumis
  10. Cucumis sativus
  11. Cucurbita
  12. Cucurbitaceae
  13. Daucus
  14. Daucus carota
  15. Erwinia
  16. insects
  17. Pectobacterium
  18. Pectobacterium carotovorum
  19. Solanum
  20. Solanum lycopersicum
  21. Solanum tuberosum

Identifiers

  1. bacterium
  2. crucifers
  3. cucurbits
  4. Erwinia carotovora
  5. Lycopersicon esculentum
  6. pest arthropods
  7. pest insects
  8. pest management decision guides
  9. phytopathogenic bacteria
  10. phytopathogens
  11. plant-pathogenic bacteria
  12. cabbage maggot
  13. bacterial infections
  14. bacterioses
  15. flaming
  16. heading broccoli
  17. advisory services
  18. extension activities
  19. fungistats
  20. watering
  21. collards
  22. crop rotation
  23. rotational cropping
  24. subsaharan Africa

Geographical Locations

  1. Africa South of Sahara
  2. Kenya

Broader Terms

  1. invertebrates
  2. animals
  3. eukaryotes
  4. prokaryotes
  5. Brassicaceae
  6. Brassicales
  7. eudicots
  8. angiosperms
  9. Spermatophyta
  10. plants
  11. Brassica
  12. Brassica oleracea
  13. Cucurbitaceae
  14. Cucurbitales
  15. Cucumis
  16. Apiaceae
  17. Apiales
  18. Daucus
  19. Enterobacteriaceae
  20. Enterobacteriales
  21. Gammaproteobacteria
  22. Proteobacteria
  23. Bacteria
  24. Hexapoda
  25. arthropods
  26. Pectobacterium
  27. Solanaceae
  28. Solanales
  29. Solanum
  30. Africa
  31. ACP Countries
  32. Anglophone Africa
  33. Commonwealth of Nations
  34. East Africa
  35. Africa South of Sahara
  36. lower-middle income countries
  37. medium Human Development Index countries

Information & Authors

Information

Published In

cover image PlantwisePlus Knowledge Bank
Pest Management Decision Guides
Pest Management Decision Guide: Green and Yellow List

Applicable geographic locations

Africa,  Kenya

History

Published online: 1 November 2016
Issue publication date: 1 January 2017

Language

English

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Soft, watery, slimy rot on the taproot, which is grey to brown (Photo: Oregon State University)
Severe pitting of carrot roots observed after the roots are harvested and washed (Photo:Lindsey du Toit, Washington State University)
Rapid decay that consumes the core of the carrot, often leaving the epidermis intact (Photo: www.extension.umn.edu)

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View figure
Soft, watery, slimy rot on the taproot, which is grey to brown (Photo: Oregon State University)
View figure
Severe pitting of carrot roots observed after the roots are harvested and washed (Photo:Lindsey du Toit, Washington State University)
View figure
Rapid decay that consumes the core of the carrot, often leaving the epidermis intact (Photo: www.extension.umn.edu)
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