I have always talked about increased susceptibility to Botryosphaeria canker and other weakly pathogenic fungi that prey on weakened plants in the landscape. So watenng during these dry times before wilting occurs will help your established trees and shrubs survive the very stressful conditions. Some symptoms of drought damage on deciduous trees and shrubs include brown leaf edges and sometimes brown areas between the veins of shallow-rooted drought susceptible trees and shrubs. Disease activity in the landscape has temporarily ground to a halt. Look for off-color foliage and examine needles closely for minute, white, circular scale covers.
Scales usually build up on the south side of shrubs or on the side against buildings.
Use a foliar absorbed pesticide, such as Orthene or Merit or a summer oil later in the season. Japanese beetle reports are coming in frequently now. Even weekly sprays will provide only partial control against adults. Fall webworm you find now may be the end of the first generation. Larvae are probably too large for Bt.