Azalea Spray

One of the most effective and convenient products I use is an imidacloprid (insecticide) drench. You mix & pour the product at the base of the shrub, it’s uptaken by the roots and distributed systemically throughout the shrub. Offers pretty much season control of the most harmful azalea insects. As a bonus some companies, Fertilome and Bonide come to mind, sell a imidacloprid drench product that also contains a systemic fungicide, usually referred as 2 in 1 product.

Most retail garden centers, and perhaps the big box stores (HD or Lowe’s) carry those products. I prefer these products to spraying for time and convenience.

As mentioned, also fertilize with a general purpose acidic shrub fertilizer- the next 2 or 3 weeks, would be a good time to apply. Fertilome has a granular azalea fertlizer that contains imidachloprid insecticide - you might consider that product. A cup or 2 of elemental sulfur spread around the root zone of each azalea will help increase soil acidity (reduce soil pH) if you have non-acidic soil.