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Bio-agent Collection

Cyphocleonus : hand pick, sweep net Agapeta : hand pick, sweep net, vac Larinus : sweep net + asperator or pump Aphthona : sweep net + accelerator Oberea : sweep net + hand pick from net. Bio-agent Collection. Cyphocleonus achates – Root Boring Weevil. Adults emerge Aug./Sept.

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Bio-agent Collection

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  1. Cyphocleonus: hand pick, sweep net • Agapeta: hand pick, sweep net, vac • Larinus: sweep net + asperator or pump • Aphthona: sweep net + accelerator • Oberea: sweep net + hand pick from net. Bio-agent Collection

  2. Cyphocleonus achates – Root Boring Weevil • Adults emerge Aug./Sept. • Lay eggs on root crown • Larvae bore into root • Over winter as larvae in root • Feeding in taproot and exit hole cause damage • Pupate in early summer • Emerge and do it all again • Do not fly • 2000-29,000+/yr..

  3. Cyphocleonus achatesknapweed root boring weevil

  4. Agapeta zoegana - root boring moth • Biology: • Adults emerge spring/summer • Lay eggs on lower stem • Larvae hatch, mine down stem into the root • Larvae over winter in root • Pupate in soil early/late spring • Larvae can move a short distance through soil to a new plant if theirs dies • Adults disperse by flying • Collected 2,950 in 2007!

  5. Over winters as adult weevil! • Adults gather at knapweed plants when flower buds appear • Females lay one egg per flower • Larvae soon hatch and consume seeds (that is a good thing!!) • Pupate in destroyed flower • Emerge as adult in late summer • Fly away and over winter • Strong flier, readily disperses • Great one-two punch with root borers!! Larinus minutus Biology:

  6. Larinus Collections

  7. Aphthona – leafy spurge flea beetles • Adults emerge from soil early/mid summer • Release pheromone, stay together • Adults feed on spurge leaves, high #’s can damage plants • Scatter eggs on soil around spurge plants • Larvae soon hatch, feed on root hairs • Major effect: larval root feeding • Larvae feed all fall, winter & spring • Pupate in soil in late spring • Becoming very successful bio-agent! • Can hop & fly, we need to disperse them…

  8. Pheromones: chemical scent signals

  9. Aphthona Photos

  10. Aphthona Collection

  11. Leafy spurge flea beetle collection

  12. Leafy spurge flea beetle collection

  13. Flea Beetle “Bomb Shell”Effect -flea beetles release attractant pheromone -stay together and spread outwards from initial release site causing larger area of damage each year.

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