The first phase takes roughly three to four years to complete, during which the insects, generally a breed of the Root Weevil family, will take shelter in the flower and begin to feed. yaunclick(); return false; The female weevil copulates many times during the egg … Available mid-May through early June. We found this guy on a cement barrier. or diffuse knapweed, you should get some of these beetles released Supporting Research, Articles, Informative Links. The weevil is a biological control for both diffuse and spotted knapweed, a noxious weed in Central Oregon. MoDOT Roadside Manager Chris Shulse discusses the departments use of the root boring weevil to control knapweed along roadsides in Missouri. Knapweed root weevils lay approximately 50 to 70 eggs on either diffuse or spotted knapweed. Cinnabar Moth (Tyria jacobaeae) If you have spotted } "Adult weevils come out in August and lay eggs on the top of knapweed roots," Breitenfeldt said. The specimen in question was a knapweed root weevil — cyphocleonus achates. Our third insect against spotted and diffuse knapweeds is the Another bio-control of spotted knapweed is the Blunt Knapweed Weevils used in spotted knapweed biological control inflict damage to the plant in two places: the seed head and the root. Conservation Services. Description. Males can be distinguished from females by the shape for the abdomen which is flat rather than round. Fortunately, conservationists have called upon another foreigner to combat it — the Cyphocleonus achates, or more simply, the root weevil. Aphthona nigriscutis and Aphthona lacertosa: $125 per release of 1,000 + insects. Image 0886054 is of knapweed root weevil (Cyphocleonus achates ) adult(s) on spotted knapweed. function noclick(scx) Eggs are oval, cream-colored and noticeable on the plant. Do not worry about depleting the spotted knapweed weevil population. In its first year, spotted knapweed, a perennial, will appear as a plant low to the ground, with deeply knotched, silver-green and almost leathery leaves. Root-boring weevils are not as widely distributed in Minnesota as the seedhead weevils. Our newest insect for the knapweeds is the Knapweed Root Weevil, Cyphocleonus achates. Cyphocleonus achates: $160 per release of 100 insects. C. achates produce one generation per year. 1418 Maple Drive Bozeman, MT 59715 readily and spread quickly through your knapweed. Russian Knapweed. We work primarily outside and speak with customers over the phone. Klamathweed Beetles (Chrysolina spp) Tansy Ragwort. At this point, they will tunnel through the root to the surface where they will feed on the leaves of knapweed … This leads to a spotty appearance of the Knapweed and a halt in the spread of the plant as the insects eat the seeds and reproduce before transitioning into stage two. Knapweed Root Weevil (Cyphocleonus achates IMPROVING BIOCONTROL SUCCESS STORING Collect weevils in breathable containers, place in a cooler on top of ice packs Place a towel/newspaper between ice packs and weevil containers to prevent freezing insects Keep insects in the refrigerator at a alert('Registered Copyright/All rights reserved © Noah Poritz'); in your knapweed infestations. aminopyralid, triclopyr, clopyralid, picloram, clopyralid +2, 4-D Hand Pulling Russian knapweed aminopyralid, triclopyr, clopyralid, imazapic Metsulfuron methyl, clopyralid +2, 4-D Hand Pulling The weevil is a biological control for both diffuse and spotted knapweed, a noxious weed in Central Oregon. Larvae are found primarily in knapweed roots and can be up to 13 mm long. Many will remain after the collection and will continue to eat away at the spotted knapweed. Image 1595763 is of knapweed root weevil (Cyphocleonus achates ) larva(e) on spotted knapweed. The larvae of root-boring weevils eat the roots of the plants and weaken or kill the plants. $75./carton of 210 adult flower weevils. Since the insect’s development is dependent on the weather, that means that many years the insects are out early and unavailable early too. Scary! per release of 100 insects. Executive Office Montana Weed Control Association, Inc. PO Box 315, Twin Bridges, MT 59754 (406) 684-5590 | (888) 664-4153 (fax) Different stakeholders have different economic interests and environmental concerns. Cyphocleonus achates, or the knapweed root weevil, is a robust biological control agent that can attack spotted (preferred host) and diffuse knapweeds. The knapweed root weevil can also be mass-reared in field corrals (Story et al. The Conservation Services Division provides technical and financial support, leadership and statewide coordination, and regulatory oversight to public/private landowners and agricultural businesses statewide on an array of natural resource management challenges. But, the most dramatic agent has been the root weevil, Cyphocleonus achates. // -->, Biological Control of Weeds, Inc. Spotted knapweed preferentially, diffuse and squarrose knapweed secondarily. Collect them in tupperware containers and place them on your flowering knapweed plant… Eggs found at the root crown are white to yellow, darkening with incubation. Knapweed Root Weevil 15 of 20 from Spences Bridge: Cyphocleonus achates (knapweed root weevil) Introduced Species from Europe. Common name: Knapweed root weevil Weeds Attacked. The weevil seed-head feeder, Larinus minutus, and the weevil root-feeder mentioned above, Cyphocleonus achates appear to rapidly reduce Centaurea diffusa populations.