Check plants 4 to 7 days after the last spray. If new adults are found, repeat treatment immediately. Foliar sprays for adult control are best if applied after dark or in the very early morning when adult exposure is greatest and direct contact control is optimized. Treatments are aimed at the adults that feed on the plant foliage at night and hid in the duff below the plant during the day. Therefore, spray the foliage, including the undersides of leaves, and especially on lower part of plant, with enough volume to run off onto ground below the plant.
Insecticides are effective against larvae in container-grown plants.
Insecticides may be applied both as foliar sprays or as soil drenches. The drench treatment is particularly important in the fall when the larvae are small and are feeding close to the surface. Because presently registered insecticides do not have a long residual life, one treatment usually will not provide adequate control in heavy infestations. Multiple applications, at 3 to 4 week intervals, most likely will be needed, depending on the insecticide used. For recommended chemical controls, see current copy of the appropriate regional commercial production publication.