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2013 update

2013 update. BLUEBERRY TIP MIDGE. symptoms life history ecology damage potential. Symptoms. look like thrips…but leaf curls are not as red, not as tightly curled, pock marked, AND curls are ONLY found on terminal leaves. Life stages of the BEAST.

olympia-daugherty
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2013 update

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  1. 2013 update BLUEBERRY TIP MIDGE symptoms life history ecology damage potential

  2. Symptoms look like thrips…but leaf curls are not as red, not as tightly curled, pock marked, AND curls are ONLY found on terminal leaves

  3. Life stages of the BEAST

  4. Hypothesized life cycle ofDasineuraoxycoccanaaka “ blueberry tip midge ” • pupae overwinter in duff layer • adult flies emerge mid-May - early June (live 4-6 days) • flies lay eggs singly on top terminal leaves • eggs hatch in a few days (temperature dependent) • larvae go through three larval instars (7- 10 days) • pupae stay in soil a week before adults emerge • several generations / yr ... in cranberry, but blueberry? Only appears to be ONE generation.

  5. damage over time – quite varied

  6. 2013 survey of blueberry tip midge damage in lowbush blueberry fields – quite variable field to field

  7. Effect of management system

  8. 2012 Blueberry tip midge control with foliar insecticides 2013

  9. Potential damage • blueberry (a minor pest in lowbush?) • reduction of flower buds the following year • non-viable flowers • less branching

  10. Damage potential 2010 - 2011 -46.5%

  11. Damage(3 in 4 trials…50% decrease in flowers)

  12. Economic thresholds IF 46.5% damage is typical

  13. Future research • Continue to survey…is it increasing in severity? • Develop an integrated pest management program • monitor midges with yellow bowl traps for time of attack • test more insecticides, but a focus on growth regulators: Dimlin, Rimonand their timing • delayed burn management

  14. Questions ?

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