Early treatment of powdery mildew

Page last updated: Friday, 2 September 2016 - 4:24pm

Please note: This content may be out of date and is currently under review.

In 2015 powdery mildew reached damaging levels in several regions. With the green bridge leading into the 2016 season, the disease could have significant impacts. This research will assess the potential of early fungicide application in preventing powdery mildew damage.

There are many new seed dressing and in-furrow fungicides registered for other diseases in wheat and they have been shown to be effective in managing powdery mildew in barley. The value of these in wheat for effectively reducing powdery mildew, and whether they could replace early foliar fungicides, needs to be investigated. Early treatment, at-seeding and Z31 foliar applications, will be assessed for management of powdery mildew of wheat.

Table 1 Trial details
Site Woorree, Geraldton
Season 2016
  1. Untreated
  2. Untreated
  3. Propiconazole at 500mL/ha at Z31 (or at 5% LAA mildew if earlier)
  4. Flutriafol in-furrow (IntakeHiload Gold at 400mL/ha or Impact at 400mL/ha)
  5. Fluquinconazole on seed (Jockey stayer at 450mL/100kg seed)
  6. Fluxapyroxad on seed (Systiva at 150mL/100kg seed)
  7. Triadimenol (Baytan) at 150mL/100kg seed
  8. Triadimefon 500 in-furrow at 200g/ha
  9. Azoxystrobin and Metalaxyl-M in-furrow (Uniform at 400mL/ha)
  10. Untreated plus foliar fungicide at Z39* (Amistar Xtra or Prosaro 150ml + wetter)


*Timing of fungicide to stop disease moving up canopy and infecting flag leaf.


10 treatments x 3 reps


If disease develops to high levels in all early treated plots then consider applying a foliar fungicide application across all plots at Z39 or as disease development dictates, at least in Treatment 10.

Crop Wheat: Zippy at 80kg/ha
Fertiliser Agstar Xtra at 100kg/ha
Herbicide Weed management as necessary


Ciara Beard