Another herbicide that may be successful is Clopyralid under the trade name Transline. Transline is more specific than Triclopyr, it is quite effective on the plant families: Compositae, Leguminosae, and Polygonaceae, with very little effect on most grasses and most other plant families. Because of the very specific nature of Clopyralid, fewer non-target species will be affected. Clopyralid has been successful in controlling crown vetch along roadsides.
There is no research on the relative success of Clopyralid. Clopyralid shows promise, but more research is needed. These herbicides can be used as spot treatment with backpack sprayers, or can be used with high-volume equipment e. Whichever herbicide is used, it appears that complete coverage of all crown vetch stems is necessary. The spray on the leaves should be thorough to the point of runoff.
Prior prescribed burning will be helpful to remove accumulated plant litter to insure complete herbicide coverage of the foliage. It is necessary to perform a follow-up treatment to get any stems missed or new seedlings. By law, herbicides may only be applied according to label directions.
Crown vetch spreads rapidly and appears to be difficult to control. Several years of treatment may be necessary to totally eradicate crown vetch from a natural community. It is important to prevent any seed production as well as to control the vegetative spread. It is useful to map locations of infestations so that they can be readily located in future years. When crown vetch is blooming, its many pink blossoms make it quite noticeable and easy to locate.
New populations can be located and treated during blooming. Previously located populations should be treated earlier and retreated later. Crown vetch has many characteristics that make it a tough exotic to control. It is necessary to locate it early and start treatment early. Watch for it along highway rights-of-way and eradicate it before it invades a natural community.
Seedlings and re-sprouts can be difficult to locate in native vegetation. Thick native vegetation can make detection of small plants difficult. Prescribed burning may be useful in removing litter for detection, but later in the season some plants may go unnoticed. Prescribed burning may be effective against seedlings or in slowing the spread of crown vetch, but it will not control large populations. Large populations of crown vetch will shade out all other vegetation and there is not enough fuel in crown vetch vegetation to carry a fire.
The periphery of the crown vetch where there is some grass fuel may be set back, but the center of the population will not be affected. Crown Vetch Control. Effects on Natural Communities Crown vetch is a serious management threat to natural communities due to its seeding ability and rapid vegetative spreading by rhizomes. Learn more about Crown Vetch. Is user submitted. The flowers of crown vetch are pinkish to white and are in crown-shaped clusters.
Each individual flower is shaped like a typical pea flower. Mowing While not completely controlling crown vetch, mowing offers a method of stopping its spread. Use of Herbicides Herbicides, at the present time, appear to be the most effective means of control. It can be introduced to new areas by moving soil infested with rhizome fragments. Its primary spread historically has been through intentional planting.
Some research suggests that deer and other small animals move crown vetch seed to new areas. Crown vetch overtakes and suppresses other vegetation, reducing species diversity and wildlife habitat. Due to its creeping growth habit, it can cover and shade out other plants and eventually form dense monocultures. Infestations, over time, can cover several acres of land. There are conflicting reports of crown vetch alternatively causing pasture bloat in livestock, and being safe for cattle to graze on.
Farmland Protection Farmland Protection. Beneficial Insects Pollinators. Home Crown Vetch. Legal Status: Restricted Propagation and sale of this plant are prohibited in Minnesota. Description Crown vetch is an herbaceous perennial in the legume family. Its stems will grow to 2 - 6 feet long in a trailing, creeping growth pattern. The leaves are dark green, pinnately compound, with 15 - 25 pairs of oblong leaflets.
Flowers are small umbels, pinkish-lavender to white, borne in clusters at the end of the leaf axils. Plants will bloom from May through August. The fruit are 2 - 3 inches in length, flattened, finger-shaped pods borne in crown-like clusters, and contain many small seeds.
Roots are aggressive rhizomes, growing horizontally up to 10 feet and vegetatively producing new plants. Flower, photo by Dan Tenaglia, Missouriplants.
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