1. Aphids

  • Description: Small, soft-bodied insects that feed on the sap of leaves and stems.
  • Affected Trees: Many types, including citrus, ash, and ornamental trees.
  • Signs: Curling or yellowing leaves, sticky honeydew on leaves, and the presence of sooty mold.
  • Control: Natural predators like ladybugs, insecticidal soaps, or neem oil can help manage aphid populations.

2. Spider Mites

  • Description: Tiny arachnids that feed on the underside of leaves.
  • Affected Trees: Citrus, mesquite, and other ornamental trees.
  • Signs: Speckled or discolored leaves, webbing on leaves, and leaf drop.
  • Control: Regular washing of leaves with water, using miticides, or introducing beneficial insects like predatory mites.

3. Bark Beetles

  • Description: Small beetles that bore into the bark and wood of trees.
  • Affected Trees: Pine, cypress, and juniper trees.
  • Signs: Small holes in the bark, sawdust-like frass, and yellowing or browning needles.
  • Control: Maintain tree health through proper watering, remove infested trees, and consider preventive insecticide treatments.

4. Scale Insects

  • Description: Small, immobile insects that attach themselves to the bark, leaves, or branches.
  • Affected Trees: Citrus, olive, and ornamental trees.
  • Signs: Yellowing leaves, reduced growth, honeydew, and sooty mold.
  • Control: Prune heavily infested branches, apply horticultural oils, or use systemic insecticides.

5. Whiteflies

  • Description: Small, white, moth-like insects that feed on the underside of leaves.
  • Affected Trees: Citrus, ash, and ornamental trees.
  • Signs: Yellowing leaves, leaf drop, and the presence of sticky honeydew.
  • Control: Introduce natural predators like ladybugs, use yellow sticky traps, or apply insecticidal soaps.

6. Leaf Miners

  • Description: Larvae of various insects that burrow into leaves, creating winding trails.
  • Affected Trees: Citrus, ficus, and other ornamental trees.
  • Signs: Winding, discolored trails on leaves and leaf drop.
  • Control: Prune affected leaves, apply neem oil, or use systemic insecticides.

7. Cicadas

  • Description: Large, loud insects that lay eggs in tree branches.
  • Affected Trees: Mesquite, palo verde, and other native trees.
  • Signs: Flagging (dying branches), egg-laying scars on branches.
  • Control: Prune affected branches, and use fine netting to protect young trees.

 

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