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Lilac / Ash Borer - Podoesia syringae 
 Whitney
Cranshaw, Colorado State University, www.forestryimages.org
 HOSTS: Ash and lilac. DESCRIPTION:
The
larvae are creamy white grubs with a dark head. Adults are moths that
resemble paper wasps. The moth is about 1" long with a wing span of
1-1/2 inches. LIFE
CYCLE: The borer
overwinters as larvae within tunnels under the bark. Adults emerge when
temperatures above 60°F. are prevalent in the spring. Cool, cloudy
weather may extend the adult flight period. Eggs are laid on bark near
wounds or bark cracks. Larvae hatch May through July. CONTROLS:Cultural: Several parasitic wasps prey on this borer. Prune trees before April since fresh pruning wounds attract egg laying adults. Pheromone traps are available to trap adult moths. Chemical: Trunk sprays of Carbaryl can be applied 2 - 3 weeks after the first adults are caught in pheromone traps. |
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