Horse-chestnut leafminer

Widespread in Europe, the grubs of this micro-moth mine leaves leading to discolouration and can initiate leaf fall. Targets Horse chestnut and Maple.

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Characteristics

  • Leaf miner grubs (2-5mm) with very deep indented segments
  • Full-grown larvae pupate in silken cocoon inside the mine
  • Moths (5mm) with shiny, bright brown forewings with thin, silvery-white stripes

Life cycle

  • Females lay 20 to 30 eggs on top of the leaf – hatch 2 to 3 weeks later
  • Horse chestnut leaf miners have 5 mobile larval stages and 2 pre-pupal stages
  • Cameraria ohridella hibernate as pupae inside fallen leaves on the ground
  • Pupae appear 4 weeks after hatching – adults emerge 2 weeks later
  • Number of generations depends on climate - 5 generations in Southern Europe, 3 in Central Europe and 2 in Northern Europe 

Damage caused

  • Can seriously damage Horse chestnut (Aesculus spp.) and maple trees (Acer spp.)
  • Larvae make mines in leaves which can overlap – causing leaf discolouration and initiating leaf fall
  • Building up less reserves during summer – damaged trees produce fewer leaves the following year
  • Affected trees are more vulnerable to other pests and diseases
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