Do you see a lot of russeted fruits with dark spots? PP nymphs produce the
honeydew that drips on the fruit surface causing the russet.. Washington State
University has a very nice factsheet.. Here is the link..
Mosbah Kushad, University of Illinois …
From: apple-crop [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of
Sent: Monday, September 18, 2017 3:36 PM
Subject: [Apple-Crop] Problem with pear trees
Hello from the Atlas Mountains in Morocco,
I hope somebody on the list can help me find the reason our two-year pear trees
produce a honey-like sticky substance.
I was told it is pear psyllia, but I do not see any insects on the trees.
Somebody else suspected gummosis. I am familiar with gummosis on cherry trees,
but the sap we see on the pear trees is less viscous, and forms only a thin
layer that drips on leaves.
Thanks for your help,
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