Late blight

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sr: see farmers experiences, what is meant with EM and BM???

B. Loehr, icipe
Is this a Minor Pest?
Minor Pest Title

Late blight (Phytophthora infestans)

Minor Pest Description

The late blight fungus affects tomatos, potatoes and eggplants but not pepper. Its symptoms consist of brown spots with purplish tinge and they can develop on leaves, stems, branches and both green and ripe fruits. In moist weather it can cause complete defoliation and rotting of fruits.


Minor Pest What to do.
  • Use resistant varieties, if available
  • Practise rotation with non-solanaceous crops (e.g. tomato, potato, peppers etc) for 3 to 4 years. However, this will only be effective if it is done in cooperation with neighbouring farmers since the fungal spores can travel quite large distances by wind.
  • In wet weather, copper fungicides, could be applied as soon as the disease is observed or as soon as local experience suggests that the weather conditions are favourable for disease development.
Minor Pest Position
Minor Pest Firstcontent
Pest Type
Common names; Late blight / potato blight
Seriousness; It is very destructive in cool, moist conditions
Host Plants