244 Redmond and Potter: Acelepryn Control of Horticultural Pests Table 1. Products and label rates used to compare efficacy of chlorantraniliprole and other insecticides in trials against pests of woody ornamental plants (reduced rates were also tested in some trials). Active ingredient Applied as foliar sprays chlorantraniliprole carbaryl bifenthrin B. thuringiensis spinosad Applied as basal drenchy chlorantraniliprole dinotefuran imidacloprid imidacloprid thiamethoxam Trade name Acelepryn Sevin SL Talstar P Thuricide Conserve Acelepryn Safari 20SG Merit 75WP Merit 2F Meridian 25WG lar), BLM (boxwood leafminer), BP (boxwood psyllid). y % AI 18.4 43 7.9 15 11.6 18.4 20 75 2 25 Label rate 0.312 ml/L (4.0 fl oz/100 gal) 2.5 ml/L (32 fl oz/ 100 gal) 0.78 ml/L (10 fl oz/100 gal) 0.52 ml/L (6.7 fl oz/100 gal) 0.47 ml/L (6.0 fl oz/100 gal) 24.25 ml/m (0.25 fl oz/ſt) 18.6 g/m (0.2 oz/ſt) 6.43 g/m (0.07oz/ſt) 19.39 ml/m (0.2 fl oz/ſt) 12.14 ml/m (0.125 fl oz/ſt) Syngenta Valent Bayer Bayer Syngenta All BLM BLM, BP JB, RS BLM z JB (Japanese beetle), RS (roseslug sawfly), OLS (oak lecanium scale), HLB (hawthorn lace bug), OA (oleander aphid), BW (bagworm), ETC (eastern tent caterpil- Rates for basal drench are per meter of plant height. Efficacy of Spray Applications to Foliage Control of Japanese beetles and feeding damage on linden Three trials evaluated efficacy and longevity of chlorantraniliprole foliar sprays to control adult Japanese beetles (JB) and reduce their defoliation of linden (Tilia spp.), a preferred JB host plant. Beetles were field-collected with standard JB traps (Trécè, Adair, Oklahoma, U.S.), baited with food-type lures (2-phenyl-ethyl-propionate, eugenol, and geraniol, 3:7:3 ratio), and brought to the lab within four hours of capture. Sexes were separated by foretibial characters (Baumler and Potter 2007); males were discarded, and females were held overnight in bins with moist soil, without food, before each assay. Freshly caught beetles were used for each trial. All trials included an equal number of replicates with foliage from non-sprayed twigs as untreated checks. Residual activity against JB on foliage Trials in two successive summers, 2011 and 2012, compared efficacy and longevity of residues of chlorantraniliprole with residues of carbaryl (Sevin SL, 43% AI, Bayer, Research Triangle Park, North Carolina, U.S.; both trials) and bifenthrin (Talstar ©2017 International Society of Arboriculture Professional Insecticide, 7.9% AI; FMC, Philadel- phia, Pennsylvania, U.S.; 2012 trial only) applied at their respective ornamental foliar application rates (Table 1). The 2011 study site was a planting of 30 young Tilia americana × euchlora ‘Redmond’ (3–4 m tall) on the University of Kentucky cam- pus, Lexington, Kentucky, U.S. Two trees were selected for each treatment and sets of similar- sized twigs where ≥12 leaves each were tagged with color-coded flagging tape corresponding to dif- ferent insecticides and residue ages. Abaxial and adaxial surfaces of all leaves on a given twig were sprayed to runoff on different dates corresponding to 28, 21, 14, 7, and 1 day(s) before the assay, with residues allowed to weather in the field under am- bient conditions before being challenged with JB. Eight similar, undamaged leaves from each treat- ment and spray date were harvested on 13 July 2011, the morning of the challenge, and placed in individual Petri dishes (9 cm diameter). Five active female JB were added to each dish. Dishes were held at 26°C on a 14:10 light:dark cycle for 24 hours, aſter which the JB were then removed and each cohort of five was placed in a separate covered black plastic tray (15 cm × 28 cm, 5.1 cm height), brought outdoors, and opened in direct sunlight. Manufacturer Syngenta Bayer FMC Bonide Dow AgroSciences Targetz All JB, RS JB, OLS, HLB, OA BW ETC
November 2017
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