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BIG IMPACT Understanding Environmental Factors Leading to the Rise in Orobanche

Orobanche species have specific conditions for germination, growth, and reproduction, which vary depending on the species and the host plant involved. However, some general conditions conducive to Orobanche infestation include:


Host Plant Presence: The presence of susceptible host crops in the vicinity is necessary for the parasite’s survival and proliferation.


Germination: Orobanche seeds remain dormant in the soil until they detect chemical compounds, known as root exudates, released by the host plant’s root, triggering germination. Soil moisture, temperature, and pH levels can influence seed dormancy and germination.


  • Soil moisture levels that promote Orobanche germination are often associated with periods of rainfall or irrigation, however, excessively waterlogged or saturated soils may inhibit germination and subsequent parasitic establishment.
  • Optimal soil temperatures for Orobanche germination typically range from around 15 to 25 degrees Celsius (59 to 77 degrees Fahrenheit).
  • Optimal conditions for germination tend to occur within a neutral to slightly acidic pH range (around 6.0 to 7.0).

Soil Conditions: Orobanche seeds are typically oval or oblong-shaped and range in size from approximately 0.3 to 1.5 millimeters (mm) in length allowing them to move easily through porous or sandy soils.


Root Contact: Upon germination, Orobanche seedlings develop specialized structures called haustoria, which penetrate the roots of host plants to extract water, nutrients, and carbohydrates.


Environmental Factors: Orobanche species typically thrive in regions with warm to hot temperatures. Optimal temperatures for Orobanche parasitism generally range from approximately 20 to 30 degrees Celsius (68 to 86 degrees Fahrenheit).


Management Practices: Continuous cropping of susceptible host plants and inadequate weed management can increase Orobanche pressure in agricultural fields.


Absence of Host Resistance: Susceptible host cultivars lacking resistance traits are more vulnerable to Orobanche infestation and can promote Orobanche establishment and proliferation in agricultural fields.


Orobanche species are highly adaptable and can exhibit considerable variation in their response to environmental factors. Additionally, Orobanche seeds may exhibit dormancy mechanisms that influence germination requirements.


Nuseed Orobanche-resistant hybrids possess genetic traits that make them less susceptible to infection by Orobanche species.


N4H202 E

A high yield, guaranteed.

EU_N4H202 E


N4H202 E is a highly stable high oleic hybrid known for its strong health throughout the season. It features advanced downy mildew disease resistance and ExpressSun® herbicide tolerance. This combination helps reduce risk for growers while maximizing field productivity.

Orobanche resistance rating: 9


N4L215 E

Early harvest provides flexibility to the grower.

EU_N4L215 E

N4L215 E is our new linoleic hybrid that excels across various regions. Its early harvest allows growers more time to prepare for winter crops, avoid drought conditions, or opt for later planting.

Orobanche resistance rating: 9