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Almonds >
Year-Round IPM Program >
Bloom to Postbloom > Monitor Peach Twig Borer
Almond
Monitor Peach Twig Borer—Bloom to Postbloom
The preferred treatment for peach twig borer populations is bloomtime sprays of Bacillus thuringiensis (Bt);
these treatments are usually sufficient to keep peach twig borer below damaging levels in orchards where migration
from external sources is not a concern.
Bloomtime Bt treatments target overwintering larvae, which feed on exposed shoots and buds before boring
into the shoot. The larvae must consume the Bt; once larvae begin feeding inside shoots, Bt treatments are ineffective.
For better control, make two applications timed to larval emergence from the overwintering
hibernacula.
Bt applications can be timed according to bloom, but this approach is less precise than monitoring emergence. Make
the first treatment at popcorn to full
bloom. Make
the second treatment 7 to 10 days later.
Later in the post-bloom season, you will need to follow up by
putting out pheromone traps.
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