Influence of water volume rate on effectiveness of late blight fungicides

Sporulating late blight on leaf

Sporulating late blight on leaf

Reducing the water volume rate, in spite of adding Break Thu to the contact fungicide Shirlan, leads to minor effects against late blight and tends to result in reduced yields. Adding Break Thru to Acrobat Plus WG, a translaminar part-systemic late blight fungicide, reducing the water volume rate has a lesser influence on yield and fungicide effect of the product.

Study design

VariantApplication rate unit/haWater volume rate l/ha
1 = untreated------
2 = Shirlan0.4400
3 = Shirlan + Break Thru0.4 + 0.125200
4 = Acrobat Plus WG2.0400
5 = Acrobat Plus WG + Break Thru2.0 + 0.2200

Development of late blight infestation in potatoes by use of Contact Fungicides

Development of late blight infestation in potatoes by use of Contact Fungicides

Development of late blight infestation in potatoes by use of Systemic Fungicides

Development of late blight infestation in potatoes by use of Systemic Fungicides

General notes on use of fungicides

  • water volume rate: 300 – 500l/ha
  • nozzles with drift reduction
  • time of spraying in dry and warm weather
  • systemic fungicides in the morning
  • contact fungicides in the morning and evening