Elm Leaf Beetle. Eggs and small larvae of this common elm leaf- feeding pest are present now. Make your observations now to determine if any small, newly-transplanted or stressed elms warrant an insecticide application. Spraying elm leaf beetles of the second generation in July will be more useful to those people who have had problems with overwintering elm leaf beetle adults residing as accidental invaders in the house. Shade Tree Galls.
Many galls are now apparent and creating concern.
Galls can not be cured after they have formed, and they do not significantly affect the vigor of established, healthy trees. See the gall pamphlet, IC-417 for more information. Galls that are easily noticed now include maple bladder gall on silver maple, succulent oak gall on pin oak, ash flower gall on ash, and elm pouch gall on slippery elm. Iowa State University , Ames, Iowa. This information subject to a usage policy .