Image 0886054 is of knapweed root weevil (Cyphocleonus achates ) adult(s) on spotted knapweed. It has little value as forage for cattle and limited seasonal value for big game. A root beetle ( Sphenoptera jugoslavica ), was released on spotted knapweed in 1983. We just introduced 2 weevils as biocontrol agents (knapweed root weevil and knapweed flower head/seed weevil) on one site which has an infestation of 500-acres. Knapweed weevils eat and develop only on knapweed and no other plants. The larvae of root-boring weevils eat the roots of the plants and weaken or kill the plants. We are also using … Klamathweed Beetles (Chrysolina spp) Tansy Ragwort. The insect overwinters as larvae in the root where the larvae mine and gall the vascular tissue. Eggs found at the root crown are white to yellow, darkening with incubation. Multiple-year attack by the weevil is causing mortality to mature spotted knapweed plants. 1418 Maple Drive • Bozeman, MT 59715 The releases are free and are provided by the Whitehall Project. Lesser Knapweed Flowerhead Weevil damage (left) and adults. Recent research by Montana State University has documented up to a 99% reductionin When I was running errands in town, I dropped off the styrofoam cooler they'd sent the bugs in, and as I approached the door, one of the Weedbusters folks was handling and cooing over a root weevil like it was a new kitten or something! KSFWs greatly reduce the number of seeds that lurk on the ground in the seed bank, waiting to grow, and eventually another European, a Buprestid beetle called the Bronze knapweed root … Knapweed Collect them in tupperware containers and place them on your flowering knapweed plant… Mecinus janthiniformis (formerly known as Mecinus janthinus ): $150 per release of 100 insects. The larvae burrow into the root and commence feeding on the root of the spotted and diffuse knapweed plant. Larvae are legless, have brown heads and c-shaped creamy white to yellow bodies. this year. declines in knapweed seed production and increased plant stress Since the insect’s development is dependent on the weather, that means that many years the insects are out early and unavailable early too. Cartons of 210 adults are $75.00. 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. We work primarily outside and speak with customers over the phone. C. achates produce one generation per year. or diffuse knapweed, you should get some of these beetles released Available late July through mid-September. { The weevil is a biological control for both diffuse and spotted knapweed, a noxious weed in Central Oregon. As the name suggests, the larvae produced burrow into the root where they metamorphose into adult form. Available mid-May through early June. } Pre-order your weevils now for July 2018 delivery! Many will remain after the collection and will continue to eat away at the spotted knapweed. This beetle will establish itself knapweed Root weevil (Cyphocleonus achates), knapweed root moth (Agapeta zoegana), knapweed flower weevils (Larinus minutus and Larinus obtusus), etc. Adults are 13-15 mm long, mottled white and brown or gray. // -->, Biological Control of Weeds, Inc. per release of 100 insects. Cinnabar Moth (Tyria jacobaeae) Like the other MoDOT Roadside Manager Chris Shulse discusses the departments use of the root boring weevil to control knapweed along roadsides in Missouri. A root moth (Agapeta zoegana) is causing a decline in knapweed biomass and vigor at sites where it is well established. An alternative choice to an expensive and time consuming insectary, is to release the insects onto a field site and go back to collect from that site. Spotted Knapweed Root Weevil (Cyphocleonus achates) Spotted Knapweed Flower Weevil … Scary! But, the most dramatic agent has been the root weevil, Cyphocleonus achates. The developing larvae mine the central taproot, damaging the weed's vascular tissue and cause root-gall formation. The Conservation Services Division provides technical and financial support, leadership and statewide coordination, and regulatory oversight to public/private landowners and … The insect overwinters as larvae in the root where the larvae mine and gall the vascular tissue. The long awaited Cypho (pronounced Sifo with a long “i” and “o”) collection season is almost upon us. Image 1595763 is of knapweed root weevil (Cyphocleonus achates ) larva(e) on spotted knapweed. 1996; Story and White 2010) or year-round in captivity (Goodman et al. Available late June through early July. 2006). As we are a family owned business, social distancing is not a problem for us. in hot, dry summer knapweed environments. The weevil, she learned, was either the four-to-five-millimeter-long Lesser knapweed beetle (Larinus minutus) or the five-to-seven-millimeter Knapweed Seedhead-feeding Weevil, Blunt Knapweed Flower Weevil, or Knapweed Flower-feeding Weevil (Larinus obtusus), two weevils that look and act pretty much the same and that, said one source, may eventually be reclassified into a single species. This large weevil lays approximately 100 eggs at the base of older/larger spotted and diffuse knapweed plants. per release of 100 insects. Lesser Flowerhead Weevil, Larinus minutus. Available late July through mid-September. the production of new knapweed seed.