With what and when should I spray azaleas for petal blight amd lace bug? Sue
06 November 2011 02:21 AM
Petal blight on azaleas must be treated before the buds open(as soon as colour is seen) with a fungicide such as mancozeb. All dead and diseased flowers must be collected and destroyed to prevent the spread of the spores by wind and water. The azalea lace bug can be treated with a Baythroid spray when they are first seen. As the weather warms up and the azaleas are putting out new growth the incidence of lace bugs will increase. To monitor hold a piece of paper under the azalea leaves and gently tap the leaves. The tiny lace bug will fall onto the paper.