Chief Sign or Symptom Probable Pest or Disease Described Under
Large holes in tree foliage made by inchworms. Canker worms (Fig. 22B) Caterpillars
Leaves skeletonized by grubs, holes eaten through by beetles. Elm Leaf Beetle (Fig. 9C) Mexican Bean Beetle (Fig. 9B) Beetles
Leaves chewed to lace. Japanese Beetles Beetles
Leaves riddled by tiny ""shot- holes."" Flea Beetles (Fig. 9A) Beetles
Leaves eaten by worms in bags. Bagworms (Fig. 6A) Beetles
Large holes in leaves near ground, mica-like trail. Slugs (Fig. 52A) Slugs
Needles chewed off by larvae withmany prolegs. Pine Sawflies (Fig.47)Larch,
Leaves skeletonized by small ""slugs."" Rose-slug (Fig. 48C, 52B) Pear-slug (Fig. 48B) Sawflies
Leaves or needles webbed to- gether. Webworms (Fig. 61) Webworms
Leaves rolled and tied. Leaf Rollers or Tiers Caterpillars
Perfect ovals and circles cut from leaf margins. Leaf-cutter Be(Fig. 6)" Bees
Leaves with crescent-shaped or ir- regular notches in from margin. Black Vine Weevil (Fig. 63B) Fuller Rose Beetle (Fig. 8) Weevils Beetles
Leaves mined between two surfacesSerpentine tunnels.Large brown blotches. Columbine LeafMiner (Fig. 33B)Birch Leaf Miner(Fig. 33A)Locust Leaf Miner LEAF MINERS