Stay in Touch with MDC news, newsletters, events, and manage your subscription. The use of herbicides, though useful, is not always the best option. It will be at least one and a half inches long and will be lone, with a slight bend in its appearance. But the rosette weevils attack the plant, which could weaken it such that it can produce fewer flower heads. If another flower head forms, cut again. Both these species are native to Europe and have undergone extensive research to ensure that they would not harm desirable native plants. My current favorite is a relatively new herbicide called Milestone. Just try to weed it without pulling out the entire root. States such as New Jersey, Pennsylvania, and New York were some of the affected regions. Although some investigators report thistle populations declined rapidly as natural succession proceeded, others report populations that persisted for twelve years in an unmanaged area. Mowing should cut the top off the thistle and expose the stem. Unlike the flower head weevil with a broad snout, this weevil has a narrow one. Plus, this weed contaminates hay and decreases its quality. We facilitate and provide opportunity for all citizens to use, enjoy, and learn about these resources. Say, for example, you have the flower head weevil in your farm; you can spray the musk thistle with chemicals between March and April. Spray white vinegar on the thistles to slowly kill them. Note that the use of herbicides will not prevent seed production in blooming plants. 2,4-D is most effective when applied 10 to 14 days before bolting in the spring. Some can remain in the soil for weeks leading to months, changing the growing conditions of other plants. Applications can take place during two seasons: spring and fall. Hoeing or tillage will control Musk Thistle. These weevils are increasing and dispersing naturally. You can distinguish the main head by its appearance. Suppose you introduce them to your field, this would fall under a release mechanism. And this could lead to the spread of the thistle to nearby areas. 2,4-D is less effective than picloram or dicamba after plants have bolted. Small flower heads. Hand-cutting with a sharpened shovel should insure that lateral as well as the terminal bud on the root crown are destroyed. The seeds have a straw-like appearance and will be at least a quarter-inch in length. This taking over of land also affects the economy. The eggs remain on the bracts for at least six days before they hatch. Musk thistle plants are not wanted here – or in most of this nation. Letâs take a closer look at these weevils: These weevils emerge as adults in the spring. The law in the region prevents anyone from planting this thistle and calls for the eradication of the existing plants. Cutting the stems does not kill the plant at this stage. Note that the applicationâs effectiveness significantly reduces when the air temperatures fall, or rainfall starts. Where you have mature plants established on your farm, you need to take action immediately to avoid spreading of the thistle. 2. Mowing, brushhogging and spraying when thistles are in full bloom is ineffective. Kansas would be an excellent example in this case. The younger the rosette, the more susceptible it is to the herbicide. If the thistle is eradicated from a site by herbicide application or other means, then the predator weevils will also be lost. Then future colonization of the site by musk thistle may require reintroduction of weevils or other means of treatment. Thank you. During this time, they can wipe out at least half of the population. These include restrictions on use near groundwater and on the season of use. 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