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

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Presentation transcript:

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

Hypothesized life cycle of Dasineura oxycoccana aka 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.

damage over time – quite varied

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

Effect of management system

Blueberry tip midge control with foliar insecticides

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

Damage potential %

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

Economic thresholds IF 46.5% damage is typical

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, Rimon and their timing –delayed burn management

Questions ?