Abstract
ABSTRACT Armored scale insects (Hemiptera: Diaspididae) are economically important pests of ornamental trees and shrubs in nurseries and landscapes. The cycad aulacaspis scale, Aulacaspis yasumatsui Takagi, and the tea scale, Fiorinia theae Green, are economically important armored scale pests of cycads, Cycas spp., and camellia, Camellia spp., respectively, in the southeastern United States. Our objective was to evaluate fungal, botanical, and chemical insecticides that were applied as foliar sprays or drenches when the motile crawler stages were active. In tests with A. yasumatsui over two years, products based on a mineral oil (SuffOil-X®), azadirachtin (Molt-X®), an entomopathogenic fungus (BotaniGard®-ES), and an azadirachtin/fungus combination applied three times, significantly reduced the number of scales on cycads, Cycas revoluta Thunb., over 3–4 months, but were less effective overall compared with the insecticidal standard dinotefuran (Safari®). In tests with F. theae, spinetoram + sulfoxaflor ...
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