Cotoneaster, Topical and Foliar Sprays Evaluated Against Japanese Beetle Adults, Wooster, Ohio, 1990

Abstract

Abstract Cotoneaster growing in 2.5 gal (9.8 liter) containers was used to evaluate selected insecticides against Japanese beetle adults. A CO2 compression sprayer at 20 psi with a single Teejet SS8004 flat-fan nozzle was used to apply sprays to run-off. Topical and foliar sprays were applied 19 Jul under sunny skies, 27°C, with 0-8 km/h winds. Plants were watered by hand every Mon, Wed, and Fri and received 5 cm of rainfall during the test period. Treatment procedures were as follows: TOPICAL: three, 10-15 cm twigs were placed upright in culture tubes with the cut end in water. Three, field-collected adults were placed on each twig, and sprays were applied. Adults and twigs were immediately transferred to 1 liter fonda containers fitted with mesh tops. Treatment effectiveness was evaluated 72 h later by assessing beetle mortality. FOLIAR: two, 10-15 cm twigs were removed from each of the 3, single-plant replicates per treatment, at specified intervals after spraying, and, along with three field-collected adults, were placed in 1 liter fonda containers with mesh tops. Residual efficacy of insecticides was evaluated 1, 4, and 8 DAT by allowing adults to feed on treated foliage for 72 h. After 72 h, moribund adults were placed on untreated foliage; final percent mortality was assessed 48 h later.