Influence of water volume rate on effectiveness of late blight fungicides

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.

Einfluss der Wasseraufwandmenge auf die Wirkung von Krautfäulefungiziden (German version)

Study design

Variant	Application rate unit/ha	Water volume rate l/ha
1 = untreated	---	---
2 = Shirlan	0.4	400
3 = Shirlan + Break Thru	0.4 + 0.125	200
4 = Acrobat Plus WG	2.0	400
5 = Acrobat Plus WG + Break Thru	2.0 + 0.2	200

Development of late blight infestation in potatoes by use of Contact 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