Image courtesy of USDA/ARS
Plum Curculio (Conotrachelus nenuphar) is a fruit pest attacking apple, nectarine, plum, cherry, peach, apricot, pear and quince. Adults eat holes in fruit and then lay eggs.
The lure is two component, pheromone + plant volatile. It is used in Dead-Inn pyramid traps for monitoring or can be placed in trees.
USDA Trap Tree vs. Whole Orchard Spray
Visually attractive trap that exploits tendency to walk up vertical surface and captured into a single collection device.
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For information on description, biology and fruit damage: