Two moths useful for biological control were tested in Slovakia in 2003-2004 (following the identification of seven insects associated with the plant and their consideration), including the monophagous "Endothenia gentianaeana". Although "Endothenia gentianaeana" was able to be reared in high numbers and its presence was found in nearly 100% of teasel plants surveyed in Slovakia, and despite the high level of damage caused by the second moth, "Cochylis roseana" (which was not targeted by local parasitic wasps frequently as was "Endothenia gentianaeana"), the USDA has not approved either of these moths for introduction as of February 2018. Instead, the USDA continues to suggest the use of herbicidal chemicals.