Gina Darin. Acroptilon repens, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. Acroptilon repens (Linnaeus) de Candolle in A. P. de Candolle and ; Acroptilon picris (Pallas ex Willdenow) C. A. Meyer; C. picris Pallas ex Willdenow. Acroptilon repens. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences.

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Range use, foods, condition, and productivity of white-tailed deer in Montana. The weed is also poisonous to horses, producing a neurological condition called equine nigropallidal encephalomalacia. The repend saprophytic fungus Boeremia exigua has also been assessed for its suitability as a biological control candidate of R. Greyish-white leaves are alternate, simple and variable in shape.

Timing of applications to the late bud and fall growth stage is critical with most herbicides to achieve good control aroptilon knapweed. The International Plant Names Index.

Acroptilon repens

In Montana, it grows in lucerne and grain fields, sagebrush areas and grasslands. Other associations include barley Hordeum spp. Based on work by Kaylee Tillery and Karan A.


Department of Agriculture, Agricultural Research Service. In Canada, different populations have different leaf shape and margin characteristics, but differences are not great enough to classify into two different forms Watson, The species was first described acroptilin Carl Linnaeus in as Centaurea repens.

Acroptolon knapweed is a deep-rooted long-lived perennial. In Wyoming and Colorado, R. It is very difficult to control or eradicate once it becomes established. Go To Encyclopedia of Life The pollen diameter is mm, spherical, 3-pored, thin-walled, about 2 mm thick and finely granular.

The achene is oblong, mm long and 0. Clopyralid applied at 1. Inner bracts are oblong-acuminate and cut-margined with hairy tips. IPM Practitioner, 21 7: The spring search should be conducted in late May to mid-June when the plants have recently bolted. National Plant Data Center.

Rhaponticum repens

To alleviate the effect of residual plant chemicals, remove or aacroptilon the treated R. This page was last modified It does well in arid areas with only mm of annual rainfall Watson, Contaminated crop seeds are likely to be responsible for its spread worldwide Groh, ; Watson, ; Maddox et al.

Flowers are pink to purplish, the marginal ones not enlarged. Picloram is not expected acropptilon bioconcentrate in aquatic organisms. A combination of methods is always more successful for a difficult weed. Weeds on the Web: Absent only from southeastern U.


The fall search should focus on any late blooming plants that might have regrown repen the root system of plants that had been pulled during an earlier search. Notes on Natural Enemies Top of page R.

This was the name designated by de Candolle in Flower production declined with decreasing light levels. Under most conditions, Subanguina picridis needs to overwinter in the soil before it is able to attack its host.

Wyoming Centaurea repens Russian knapweed Noxious weed. The range of Subanguina picridis is limited because the nematodes can not travel far from their host plants. Acriptilon fragments readily regenerate as new individuals after cultivation.

Recovery Plan for Silene spaldingii Spalding’s Catchfly. Journal of Plant Protection Research, 52 2:

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