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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Crab Apple > Rolled or deformed leaves

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Crab Apple > Leaves > Rolled or deformed leaves

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  • Image: Powdery Mildew 1
  • Image: Powdery Mildew 2

Powdery Mildew
Podosphaera leucotricha

  • Part or all of infected leaves are covered in white-gray, felt-like patches
  • Infected leaves will curl, twist, or fold upward
  • Infected blossoms are distorted, discolored, and covered in white powdery fungal growth
  • Infected fruit have bronze, corky streaks, that are skin deep
  • More information on Powdery Mildew
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  • Image: Obliquebanded Leafroller 1
  • Image: Obliquebanded Leafroller 2

Obliquebanded Leafroller
Choristoneura rosaceana

  • Early season larvae feed on the undersurface of a leaf along the midrib or other large vein
  • Early season larvae feed inside bud clusters and developing fruit, resulting in fruit drop or corky scars on the fruit
  • Late season larvae can scar the fruit
  • Larvae are yellow-green and 1” in length when mature
  • Adult moth is reddish-brown with brown bands on the wings
  • More information on Obliquebanded Leafroller
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  • Image: Redbanded Leafroller 2
  • Image: Redbanded Leafroller 1

Redbanded Leafroller
Argyrotaenia velutinana

  • Larvae skeletonize leaves from the underside, folding and webbing the leaves together
  • Fruit injury is usually shallow with ragged edges and thick, corky tissue over the damaged area
  • Larvae are green with a green head, and reach about ½" at maturity. Larvae are yellow-green and 1” in length when mature.
  • Larvae are present early May – June
  • Adults have distinct red-brown bands on the forewings that form a V-shape when at rest, and are about ¼" in length
  • More information on Redbanded Leafroller

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