Sunday, June 10, 2018

Stem borers in apple

Hello, everyone,
On Friday I visited an orchard with an infestation of stem borers - Oberea, probably Oberea myops, in the longhorn beetle family Cerambycidae.  This species also bores in the twigs of blueberry and rhododendron.  Another longhorned beetle, roundheaded appletree borer, is usually found under the bark of the trunk.  In this infestation, the infested shoots often resembled shoot blight, a phase of fire blight.  At the base of the twig was a tiny entrance hole, often with whitish sawdust-like frass. The long, legless yellowish larvae could be found when tunnels were opened.

More later, Doug

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