Lures that are replaced should be removed from the orchard and discarded. Lures which are not being used should be stored in a freezer. Lures stored under these conditions can remain viable for several years. Although research has shown that the higher up in a tree a trap is placed, the high trap data from traps placed at eye level show the same pattern of activity. For producers convince it is recommended that trap height be convient.
Pheromone traps are only indicators of the onset of adult activity.
It is recommended that orchards of 50 acres or less use 3 to 5 traps and orchards larger than 50 acres use at least 5 traps. Trap monitoring 3 to 4 times a week would provide producers with accurate information. Research has shown that oviposition should begin 7 to 12 days and nut entry occurring 12 to 16 days after initial catch. Trap catches can not at this time be used to predict the threat of damage by casebearer larvae or the need to apply an insecticide . A summary of PNC activity leading to first summer generation nut enty is listed in table 1.