2018 ASHS Annual Conference

Crapemyrtle bark scale is a newly introduced insect pest of crapemyrtles. Many challenges present when managing this scale in nursery production, including a lack of chemical trials conducted with infested plants. Two container trials were conducted during 2017, each with 60 ‘Natchez White’ crapemyrtles in 1-gal pots. Treatments included in Trial 1 were: Mainspring 200SC, its tank mixes with CapSil, NuFilm17 or SuffOil-X, Acelepyrn, and its tank mix with CapSil. Treatments included in Trial 2 were: Fulcrum, Molt-X, SuffOil-X, tank mix of Fulcrum and SuffOil-X, and tank mix of Molt-X and SuffOil-X. Imidacloprid 75WP and an untreated control were included in both trials. Plants were inoculated with a greenhouse colony of crapemyrtle bark scale 8 weeks prior to treatments, and plants were inspected for crawlers, 2^nd instar nymph and female adults/ovisacs at d14, 28, and 56 after the treatment application. Imidacloprid provided moderate control effect in both trials. Compared with the untreated control, Acelepyrn and its tank mix with CapSil, and the tank mix of Mainspring with SuffOil-X provided moderate control at d28 but the effect was not significant by d56 in Trial 1. Fulcrum and its tank mix with SuffOil-X provided effective control up to d56 in Trial 1. SuffOil-X and Molt-X provided moderate control as stand-alone products.