[Apple-Crop] Problem with pear trees

[Kushad, Mosbah M]

Hi Mohamed:

I only saw one dark brown leaf in one of the two photos, which could be affected by the honeydew, since I don’t see any sign of fireblight on the twigs..   The cupping and drying of the other leaves is likely due to high wind or drought since most of the damage is on the margins of the leaves …. What part of Morocco are you at?    I am assuming that you are close to Midlet, the apple growing region in Morocco. . I have been in that area twice in the last two years…. Please send me your direct e.mail…   Mosbah Kushad, University of Illinois kushad at illinois.edu

From: apple-crop [mailto:apple-crop-bounces at virtualorchard.com] On Behalf Of Mohamed Merigh
Sent: Wednesday, September 20, 2017 7:36 AM
To: apple-crop at virtualorchard.com
Subject: Re: [Apple-Crop] Problem with pear trees

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<mailto: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<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<mailto: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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