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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.
Monitoring
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.
Direct Control
Remove the infected crops and bury them outside the field.
Direct Control
Restrictions
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
