_Elm-leaf beetle._--Generally speaking one thorough and timely spraying

is ample to control the elm-leaf beetle (Fig. 235). Use arsenate of lead, 1 lb. to 25 gal., and make the application to the under side of the leaves the latter part of May or very early in June in New York. Occasionally, when the beetle is very abundant, due in all probability to no spraying in earlier years, it may be advisable to make a second application, and the same may be true when conditions necessitate the application earlier than when it will be most efficacious. This latter condition is likely to obtain wherever a large number of trees must be treated with inadequate outfit.

[Illustration: Fig. 235. Elm-leaf beetle, adult, somewhat enlarged (after Howard).]