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