If it is necessary to use dirt roads for orchard operations, use a water truck or trailer to prevent dust, especially during summer months when heat convection currents carry dust well up into the tree canopies. In recent years, control measures have usually not been required in California. In dealing with these latter pests it is best to spot treat individual trees to avoid an avocado brown mite outbreak. If treatment for the avocado brown mite is required, treatment of individual trees in late summer or fall is the best approach. Sulfur is effective in warmer areas.
Oil is an alternative material, but requires good coverage.
Sulfur sprays are often not effective in coastal areas where temperatures do not promote fuming action. Requires good coverage to be effective. Do not apply within this many days of harvest. The Regents of the University of California. All rights reserved.