Resistance Management

Recent testing from New Zealand vineyards has shown reduced sensitivity and potential resistance development to two fungicide groups. These are Group 3 – DMI fungicides and Group 11 – QOI (Strobilurin) fungicides.

Luna Sensation is a co-formulation fungicide containing  fluopyram (an SDHI- Group 7) and trifloxystrobin (a QoI Group 11). Luna Sensation is classified as a medium- high risk fungicide for resistance development. To protect both active ingredients, Bayer has restricted the use of Luna Sensation to one application per season (see Spray Programmes). This is in line with recognised sound industry resistance management practices and global FRAC guidelines as below

  • Restrict the number of applications of high risk single site MoA fungicides
    • Bayer recommendation is only one Luna Sensation application per season
    • Bayer recommends not using consecutive applications of SDHI/QoI mixture fungicides
  • Rotation of different MoA fungicides
    • As per in Spray Programmes, rotate and use different MoA fungicides through the season long spray programme.
  • Use the most effective products to control the disease. Preventing disease outbreaks delays the development of resistant pathogen populations.
    • Luna Sensation has shown best in class efficacy in controlling powdery mildew in trials in New Zealand. Field Trials page
  • Tank mix single site MoA fungicides with multi-site fungicides
    • Luna Sensation can be tank mixed with sulphur
  • Use preventatively
    • Do not use Luna Sensation on an already established powdery mildew infection

In May 2016, Dr Andreas Mehl, Senior Scientist at Bayer’s Research Institute for Disease Control visited New Zealand. Dr Mehl has worked for 20+ years researching fungicide MoAs, fungicide resistance management and disease control management. Dr Mehl is involved as a member of FRAC (Fungicide Resistance Action Committee) and works closely with the industry and global researchers on fungicide resistance.  While here Dr Mehl was able to answer several questions relating to grape powdery mildew resistance issues. These can be viewed below.

Question 1

Does the low rate of fluopyram in Luna Sensation increase the risk of botrytis resistance?

Question 2

What is your recommendation for using Luna Sensation in grape powdery mildew programmes?

Question 3

Does trifloxystrobin provide any control when using Luna Sensation?

Question 4

What are your thoughts on recommending Luna Sensation with Sulphur?
Bayer Guide to Fungicide Resistance