[Apple-Crop] Problem with pear trees

[Mohamed Merigh]

Hi Mosbah,

Thank you for your reply and for the link.

Just got some pictures of the foliar damage: on most (but not all) trees
affected, the honeydew causes the leaves to become very dark brown before
they dry off and fall.  Some trees have been completely "defoliated".

However, unless we need to use a magnifying glass, we do not see psylle in
any form (egg, nymph, or adult).  The honeydew "seems" to come out of the
buds but we could be wrong.



Regards,
Mo

On Sep 18, 2017 10:48 PM, "Kushad, Mosbah M" <kushad at illinois.edu> wrote:

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..
http://jenny.tfrec.wsu.edu/opm/displaySpecies.php?pn=120..

Mosbah Kushad, University of Illinois …



*From:* apple-crop [mailto:apple-crop-bounces at virtualorchard.com] *On
Behalf Of *Mohamed Merigh
*Sent:* Monday, September 18, 2017 3:36 PM
*To:* apple-crop at virtualorchard.com
*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,

Mo

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