We have a linden tree that is a Japanese Beetle magnet. As the tree grew, the weapons were upgraded. For years a normal garden sprayer worked. Then a big stepladder in conjunction with the garden sprayer. For a couple years the homebrew pressurized tank fabbed from an old R12 jug. I did bring a bucket truck home one year. Last time for spraying was simply using the DeWalt 20V pressure washer with a zero degree tip. The last few years I've had success with Bayer systemic stuff poured in a circle around the tree. No more spraying needed.