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Bronze Birch Borer - Agrilus anxius
  David G. Nielson, Ohio State University Whitney Cranshaw, Colorado State University, www.ipmimages.org www.ipmimages.org  HOSTS: Birch. DESCRIPTION:
Adults
are olive-brown beetles with blunt heads and tapering bodies about
½ inch long. Larvae are white wormlike grubs with an enlarged
flattened area just behind the head and no legs. LIFE
CYCLE: Adults
emerge in late May through June. Females lay eggs primarily on unshaded
sides of trunks and branches. Larvae hatch June through July and tunnel
into birch tree cambium. There is one generation per year. Larvae
overwinter and pupate into adult beetles in early spring. CONTROLS:Cultural: Keep birch well watered during the dry months of July and August. Mulch with 1 - 3" of composted wood bark. Remove and discard limbs with raised ridges on the bark and/or top dieback in late winter. DO NOT PRUNE after the first of May - fresh wounds attract adults. Betula nigra (River Birch) “Heritage” is somewhat resistant. Chemical: Trunk injections of insecticide done in May. |
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