An effective navel orangeworm (NOW) pheromone formulation is now commercially available in a lure to be placed in traps for field monitoring. As described
in the March issue of California Almonds Outlook, it took 30 years of research, much of it funded by the Almond Board, to identify and test the critical pheromone components and their appropriate blend.
The pheromone lure is available from Suterra. A four-component blend is formulated in a dispenser that ABC-funded research shows is effective for four to five weeks in the field. The dispenser is typically used in conjunction with a large plastic delta trap.
Almond Board–funded researchers will be looking at how a commercially available pheromone trap will best fit as a tool for NOW spray timing decisions, both in spring and during the hullsplit period. Navel orangeworm monitoring is unique in that it is possible to track both female activity with egg traps and male activity with pheromone traps. A disadvantage of egg traps at hullsplit has been that their effectiveness drops off as the crop spilts, making it difficult to track flight trends. Pheromone trap effectiveness, however, will continue beyond hullsplit.