Pignut · Hoffmannseggia glauca
(Ortega) Eifert · has deep roots
on which develop nut-like tubers 10 to 15 inches below the surface and
are difficult to remove from the soil. This plant is a herb, the stems
of which are 8 to 12 inches high, with a tuft of leaves at the base.
The leaves are twice divided, 3 to 5 inches long, and there are usually
3 to 5 pairs of leaflets. The leaflets are oblong in shape, and from
1/12 to 1/4 inch long. The leaves have characteristic glandular dots. The
flowers are of the pea-type, yellow or orange-red, and about one half
inch long. The ovary of the flower is covered with peculiar tack-shaped
glands. The pods are flat, about 1 to 1½ inches long, and a few to
Cultural Control Practices
Cultivation - Cultivate three to five inches deep at intervals
so as to
permit the weeds to grow not more than 10 days after each emergence
of first plants, but not to exceed intervals of three weeks.
Cultivation shall be continued until the plants have been eradicated or
have been suppressed to such an extent that remaining plants may be more
economically destroyed by other treatment, as the application of
approved chemicals to individual plants or by hand cultivation. Small
infestations should be grubbed out, taking care to remove all the
tuberous nut-like roots.
The following herbicide may be used for cost-share with landowners. Other
products labeled and registered for use on this noxious weed in Kansas may
be used in accordance with label directions but are not available for cost-share.
· (Restricted-use pesticide). Do not apply to cropland. Follow label directions and precautions.