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Abstract
Abstract The efficacy of augmentative releases of a predatory thrips, Franklinothrips orizabensis, was assessed for control of avocado thrips, Scirtothrips perseae. F. orizabensis were released weekly at a rate of 50 pupae per tree into replicated experimental blocks in two different ‘Hass’ avocado orchards in southern California, USA. Thrips-days calculated from weekly population counts and yellow sticky card monitoring were used to compare S. perseae and F. orizabensis densities in release and non-release (control) blocks. Augmentative releases of this predator failed to demonstrate an ability to control low densities (
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