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Willow Blotch Leaf Miner



The willow blotch leaf miner (Micrurapteryx salicifoliella) is a native insect that attacks all species of willows growing in the Grande Prairie area.  Adults are a small, grey, mottled moth, while larvae are translucent yellow and grow to 6.5mm long.  The leaf miner overwinters as an adult, emerging in May to mate and lay eggs.  Once they hatch, larvae burrow into the willow leaves and feed in between the upper and lower surfaces, causing yellowish, necrotic blotches that give the insect its name.


Plants Affected

  • All species of native and introduced willow (Salix spp.) in the Grande Prairie area are susceptible to attack. 

SymptomsWillow Blotch Leaf Miner

  • Yellowish blotches on leaves.
  • Larvae will be visible inside the leaf, along with black specks of frass.  


  • No chemical controls are available.
  • Ensuring landscape trees are healthy will help them fend off attack.
  • This is mainly an aesthetic pest; even severe defoliation rarely damages tree health. 
Last updated: 9/16/2013 8:52:10 AM