Hawthorn leafmining sawfly (Profenusa canadensis)

Gail Ruhl, Senior Plant Disease Diagnostician, Interim P&PDL Director, Purdue University

Do the leaves on your hawthorn trees look like they have been torched? Have you been watering the tree because you thought the scorched leaves were due to drought? You need to look more closely at those leaves. Hold a leaf up to the light and you will see that they have been 'mined' by a sawfly insect pest called hawthorn leaf miner. Additional images and information are available at: http://www.ppdl.purdue.edu/ppdl/weeklypics/Weekly_Picture5-7-01-2.html

Click on image to enlarge

Leaf scorch symptom from leaf miner damage
Leaf scorch symptom from leaf miner damage	Backlighting illuminates 'mined' leaf and the larvae's black fecal material between the leaf surfaces

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