THE RESPONSE OF PEACH TWIG BORER (ANARSIA LINEATELLA), SAN JOSE SCALE (QUADRASPIDIOTUS PERNICIOSUS) AND THE SCALE PARASITOID ENCARSIA PERNICIOSI TO DORMANT SPRAYS IN ALMOND

Many almond growers in California have eliminated the dormant spray applications in recent years.
This experiment was conducted in 1998-2000 to determine whether the Peach Twig Borer (PTB) (Anarsia lineatella), and San Jose Scale (SJS) (Quadraspidiotus perniciosus) would become economic problems if dormant sprays were not applied, and how sprays might affect the scale parasitoid Encarsia perniciosi.
Mature almonds were sprayed in late January of 1998, 1999 and 2000 with several dormant insecticide combinations applied in water at the rate of 935 l/ha (100 gpa):
For peach twig borer, no dormant treatments have demonstrated a clear benefit in controlling PTB in this orchard.
Insecticide treatments have resulted in a slight reduction in male San Jose scale counts in pheromone traps. Encarsia perniciosi will often give economic control of San Jose scale if in-season sprays do not interfere with this parasitoid.

III International Symposium on Pistachios and Almonds

L.C. Hendricks, W. Bentley

Almond, pests, treatments, winter.

https://doi.org/10.17660/ActaHortic.2002.591.88