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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Late blight on potato

Phytophthora infestans
China
  • Resistant Varieties (Zhongshu No. 2)
  • Disease-free tubers
  • Enhance field management, practice early sowing, choose a field that has loosened soil and good drainage capability, reduce the humidity in the field, promote strong growth to increase resistance to the disease.
  • Destroy residues of potato and tomato crops by burning or burying at the end of the season to prevent disease.
  • After seedlings emerge, conduct routine field monitoring (every 3 days) in the morning to see if the disease occurs.
  • Symptoms: water-soaked brown-green lesions appear at leaf edge and leaf apex. When climate is humid, the lesions expand quickly and turn brown, with white mildew attached (especially on the underside of the leaves); when climate is dry, the lesions dry up and also turn brown, but expand slowly (no white mildew appears).
  • Direct control should be carried out when late blight occurs sporadically.
  • Remove the infected crops and bury them outside the field.
  • Chemical pesticides must be applied strictly according to the prescribed dosages to avoid residue problems
  • Rotational application of pesticides to avoid resistance
  • Use of PPEs is recommended when using chemical pesticides
  • Dimethomorph
  • WHO U, 3~4 sprays at the early stage of infection with 5~7 days intervals
  • Mancozeb
  • WHO U, 3~4 sprays at the early stage of infection with 5~7 days intervals
  • Mandipropamid
  • WHO U, 3~4 sprays at the early stage of infection with 5~7 days intervals
  • Fluopicolide. propamocarb
  • WHO classification unclear, 3~4 sprays at the early stage of infection with 5~7 days intervals
AUTHOR(S): Zhang Yongyang, Pengshan PPS

CREATED/UPDATED: March 2014
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.