9. Japanese beetles (Popillia japonica)
Adults: metallic blue-green, 1⁄2-inch beetles with bronze wing covers. Larvae: fat, white grubs with brown heads.
Host/Range: Many vegetables and flowers, small fruit. Found in all states east of the Mississippi River.
Damage: Adults skeletonize leaves, chew flowers, may completely defoliate plants; larvae feed on lawn and garden plant roots.
Control: Shake beetles from plants in early morning; apply floating row covers; set out baited traps upwind of your garden on two sides and at least 30 feet away; apply milky disease spores or Herterorhabditis nematodes to soil; spray beetles with insecticidal soap.
10. Scales (more than 200 species)
Adults: females look like hard or soft bumps on stems, leaves, fruit; males are minute flying insects. Larvae: tiny, soft, crawling larvae with threadlike mouthparts.
Host/Range: Many fruits, indoor plants, ornamental shrubs, and trees. Found throughout North America.
Damage: All stages suck plant sap, weakening plants. Plants become yellow, drop leaves, and may die. Honeydew is excreted onto foliage and fruit.
Control: Prune out infested plant parts; encourage native predators; scrub scales gently from twigs with soft brush and soapy water, rinse well; apply dormant or summer oil sprays; spray with neem oil.