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Thumbnail ImageUnknown lichen on July 23, 2018
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Contributors » Elijah » Unknown

Unknown discovered by Elijah (#10805)

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Sighting Info

Observed: October 24, 2018 @ 4:25 PM
Posted on: January 3, 2019 @ 12:42 AM (diff: 70 days)
Comments:
This plant was found in the woods by Middle Cove Beach. Could the dark lines in the leaves be caused by disease?

Sighting's Identification

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Newfoundland Nature

Newfoundland Nature

Comments by Site Members (scroll to post comment)

By Barry Hicks on 3/4/2019 11:06:05 PM

Elijah,  the dark lines are caused by a leaf mining insect (likely a fly in the Family Agromyzidae).  Notice that the lines are narrow, that's when the maggot is small and as it feeds and grows larger, the line gets fatter.  The fly pupates and emerges from the leave.  You would find a hole in the leaf epidermis at the end of the line.

By Barry Hicks on 3/4/2019 11:07:01 PM

The lines are dark because of the frass (poop) produced by the insect as it is feeding.

By Elijah on 3/4/2019 11:39:03 PM

Thank you for the information! 

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