Webinar delivered on March 2nd, 2021 organized by Rainbow Treecare Scientific Advancements. This presentation includes detailed information about crapemyrtle bark scale, cycad aulacaspis scale, and a quick ‘field-guide’ style view of several other common scale insects of Texas.
Presentation delivered through webinar as a part of the “All Bugs Good and Bad Webinar” series. This presentation gives some basic biological of aphids, scale insects and whiteflies and how to find resources to manage them.
Efficacy of a horticultural oil + insect growth regulator mix (SuffOil-X + Molt-X) and two imidacloprid formulations (Bayer Tree and Shrub; Fertilome Tree & Shrub Systemic Insect Drench) were tested for control of bark scale (Eriococcus lagerostroemia) on crapemyrtles at LeTourneau University. There was a trend towards decreasing alive scales and decreasing alive:dead scale ratio with time, especially by the fifth week in all treatments (including the control). The systemic insecticides (imidacloprid) demonstrated a decrease in alive:dead scale ratio two weeks after treatment, whereas contact treatments showed a decrease one week after treatment (horticultural oil + insect growth regulator). Since the control also showed decrease in scale populations, in some cases before other treatments, the efficacy of the insecticides studied here are inconclusive.