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Apples > Fruit >Deformed fruit

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  • Image: Apple Scab 1
    Credit: University of Georgia Plant Pathology Archive, University of Georgia, Bugwood.org
  • Image: Apple Scab 2

    Credit: M. Grabowski, University of Minnesota

  • Image: Apple Scab 3

    Credit: M. Grabowski, University of Minnesota

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green arrowApple Scab
Venturia inaequalis

  • Brown raised corky spots on fruit
  • Severely infected fruit may be deformed and cracked
  • Olive green to brown leaf spots with an irregular or feathered edge, eventually becoming a dark brown to black
  • Infected leaves turn yellow and drop prematurely
  • More information on Apple Scab...
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  • Image: Apple Maggot 1
    Credit: Department of Entomology, University of Minnesota
  • Image: Apple Maggot 2

    Credit: Department of Entomology, University of Minnesota

  • Image: Apple Maggot 3

    Credit: T. McCamant, Northland Community and Technical College

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green arrowApple Maggot
Rhagoletis pomonella

  • Adult fly causes punctures by laying eggs under the apple skin, resulting in dimpled and misshapen fruit
  • Larvae tunnel inside fruit resulting in brown streaks and decay
  • Adult fly is black with clear wings and black bands, and a white spot on the back
  • Larvae are legless, white, and 1/3""in length when mature (rarely seen)
  • Adults are active from July until September
  • More information on Apple Maggot...
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  • Image: Plum Curculio 1
    Credit: J. Hahn, University of MN
  • Image: Plum Curculio 2

    Credit: T. McCamant, Northland Community and Technical College

  • Image: Plum Curculio 3

    Credit: E. Levine, The Ohio State University, Bugwood.org

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green arrowPlum Curculio
Conotrachelus nenuphar

  • Adult weevils lay eggs in the apples resulting in distinctive crescent shaped tan spots on the skin
  • Fruit can become misshapen and often drop prematurely
  • Adult weevil is small (1/5” in length), dark brown with whitish-gray patches, bumps on the wings, and a distinctive downward-curved snout
  • Mature larvae are yellow-white, ¼" long, and c-shaped (rarely seen)
  • Adults active in early spring (during bloom)
  • More information on Plum Curculio...
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  • Image: Apple Curculio 1
    Credit: T. McCamant, Northland Community and Technical College
  • Image: Apple Curculio 2

    Credit: J. Hahn, University of MN

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green arrowApple Curculio
Anthonomus quadrigibbus

  • Adult weevils makes small punctures by feeding and laying eggs in the apple, resulting in a round tan spot and lumpy/misshapen fruit
  • Adult weevil is reddish brown, ¼ inch long, with four bumps on their backs
  • Weevils are present in early spring
  • More information on Apple Curculio...
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  • Image: Tarnished Plant Bug 1
    Credit: Cornell-NYSAES, Geneva
  • Image: Tarnished Plant Bug 2

    Credit: J. Hahn, U of MN

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green arrowTarnished Plant Bug
Lygus lineolaris

  • Young fruit can have pitted, deformed fruit when adults insert eggs and feed on them
  • Feeding on flower buds results in loss of flowers
  • Adults are oval shaped, approximately ¼ inch long, brownish in color with streaked yellow and black lines (tarnished appearance), and have a white V-shaped marking on its back
  • Nymphs may be confused with aphids, however, they move fast when disturbed (aphids do not)
  • Adults and nymphs are present early in the season (April-May)
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  • Image: Bitter Pit
    Credit: Adriana Telias, University of Minnesota
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green arrowBitter Pit

  • Fruit develops dark sunken pits & brown corky tissue within the white apple flesh around the blossom end of the fruit
  • Physiological disorder which may be caused by calcium deficiencies
  • More information on Bitter Pit...

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