Bio-agent Collection

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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.

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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..

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Cyphocleonus achates knapweed root boring weevil
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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!

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Larinus minutus Biology

• 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!!

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Larinus Collections
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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

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Pheromones chemical scent signals
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Aphthona Photos
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Aphthona Collection
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Leafy spurge flea beetle collection
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Leafy spurge flea beetle collection
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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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