Pests
Helianthus annuus L.
Weevils are pests of sunflower seedlings that damage cotyledonary leaves and stems. High pest populations lead to stand thinning, sometimes requiring reseeding.
In the reference 4 varieties crop Sunflower, where this is mentioned in the description.
The beet weevil (Tanymecus palliatus Fabr.) and the southern gray weevil (Tanymecus dilaticollis Gyll.) are the most common species found in sunflower crops. Adults cause damage during the seedling stage by feeding on cotyledonary leaves and clipping young stems; they can also damage sprouts before they emerge above the soil surface.
The economic threshold for weevils is set at 2 beetles per 1 m² during the emergence period and up to 5 beetles per 1 m² during the 4–5 true leaf development stage. Genetic mechanisms of sunflower resistance to these pests have not yet been identified.
General information about the subject — on the page Weevils.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Helianthus annuus L. · Sunflower
PACIFICO
Helianthus annuus L. · Sunflower
Interstate Seed Co.
Helianthus annuus L. · Sunflower
NORTHRUP KING
Helianthus annuus L. · Sunflower
Domaine Public (FR)