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)

TWO INTERNODES STAGE
BBCH32

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

Symptoms:

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

INCLINED FLOWER BUD
BBCH61

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.

Symptoms:

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

FALL OF LIGULATE FLOWERS
BBCH73

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

Symptoms:

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.

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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) 

NORUST HYBRIDS

CONTROL HYBRIDS

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

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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.

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