Bull thistle (Cirsium vulgare), common mullein (Verbascum thapsus), and Klamath weed (Hypericum perforatum) have been identified as noxious pests in Yosemite since the 1940s.
Serious (noxious) pests appear to be more prevalent in genera with higher chromosome numbers and, speculatively, to form polyploid hybrids.
But the most noxious pest in Smith's estimation is the feral hog, which has caused so much crop damage in Van Zandt County -- $30,000 to the Smiths' farm alone in 2002 -- that at times there is a bounty on them.
The migratory locust, Locusta migratoria, a noxious pest insect in the world, is often found in sympatry with G. marmoratus or O. asiaticus, although the geographical ranges of the two latter species don't overlap.
As ecologists have come to accept the "impure" nature of urban environments, they have been re-evaluating the role of exotic plants, imported species that have traditionally been regarded as noxious, aggressive pests crowding out native North American species.
She said rangers had provided food and water for the wombats in times of drought, carried out controlled burns to prevent wildfires, removed noxious weeds and pests, and slashed areas of land to stimulate new grass growth.
Be aware that plant certifications, both for species and plant health, are required in many jurisdictions, so be prepared to document seed sources, and have your plants checked by a certifying agent for diseases, noxious weeds, and pests.
Witch weed is a noxious and persistent pest in farm fields: yield losses due to S. gesnerioides parasitism are extensive in the Sudano-Sahelian belt of west and central Africa [ 8].
The USDA-APHIS currently inspects plant imports for only a short list of federally prohibited noxious weeds (and plant pests and pathogens) and records pest interception data for these prohibited species in the Port Information Network (PIN) database (Mack et al. 2000; Reichard and White 2001; National Research Council 2002; D'Antonio et al. 2004; Table 2).
Although highly variable, the invasiveness of C. gigas has been demonstrated in several countries and this species is considered as pest or noxious in an increasing number of coastal areas [ 13].
Asian carp were taken to North America during the 1960s and '70s to control the growth of noxious aquatic plants, snails, and other pest organisms in ponds, fish farms, and small lakes.
