NORUST Sunflower hybrids

Black Rust is one of most aggressive disease for sunflower, it can impact up to 80% yield losses and oil content until 15%.​ This has let us to develop the NORUST hybrid, which have the best tolerance against black rust in the market. With NORUST hybrids, you can sow in all situations:

  • In low pressure: no visible symptoms,
  • In high pressure without fungicides: later appearance of black rust infection and less impact compared to competitors,
  • In high pressure with fungicides: only minimal infection and less impact compared to competitor.

Sunflower hybrids with the best tolerance to black rust

  • Genetic tolerance is the most efficient solution against black rust.
  • NORUST hybrids are selected for their high tolerance to black rust:
    •      8 to 9 notation in 100% of our R&D trials
    •      -30% black rust attacks compared to the market reference varieties.

Understand black rust life cycle

The disease appears from June to the harvest. The ideal growing factors are:

  • High air moisture conditions (85-92%)
  • Periodic rains
  • Temperatures between 12 to 30°c (optimum 25°c)


Period: June
After over-wintering in crop residues, telia germinates and the fungi infect sunflower leaves.


  • Pycnia: Yellow-orange spot on top side of lower leaves.
  • Aecia: orange spots on underside of lower leaves in opposite of pycnia.


Period : End of June to end of August
Reproductive and spraying phase. Pustules appear after 2 weeks on both sides of leaves and
repeat cycle every 10-14 days.


Uredinia: Orange-brown spot with spores on both side of leaves.


Period : August to harvest
Cold temperatures or maturity of sunflower stop reproductive phase and induce the change
to overwintering stage (Telia).


Telia: dark brown-black spots without spores.

Sunflower Hybrids with the Best Tolerance to Black Rust

NORUST hybrids have the best tolerance against blackrust in the market.

Black rust management

  • Choosing seed with genetic resistance is the most efficient solution against black rust.​ 
  • Respect crop rotation with a delay of 4 years between 2 sunflower cultivations.​ 
  • Use of fungicide at first symptoms of rust – when 1% of the leaf is infected.

Caused by Puccinia helianthi spp., black rust affects around 8 millions of hectares globally in Northern America, Russia, Ukraine, Argentina and Australia. The disease appears from June to the harvest. The ideal risk factors are: ​ 

  • High air moisture conditions (85-92%)​ 
  • Periodic rains​ 
  • Temperatures between 12 to 30°C (optimum 25°C) 



Other genetic innovations

GREEN+ silage maize varieties secure the silage quality as they have the genetic ability to delay maturity and show slower evolution of the grain dry matter.

WATERLOCK grain maize hybrids that are offering a superior ability to thrive under drought stress conditions.

HELIOSMART varieties have the highest genetic tolerance to three main sunflower diseases: Mildew, Sclerotinia and Verticillium, and thus secures the yield.

SAFETY+ winter oilseed rape hybrids safeguards the yield in cold climates with better early vigour and strong development before winter.

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Discover a full range of sunflower portfolio, linoleic and high oleic, for all maturities

Contact us

Our local teams visit farms and distributors on-site to give you the best advice for your location. Find your local MAS Seeds® consultant by visiting a country website or fill out our contact form here.