0
points
Cherry and Pecan with the same problem?

Cherry (including sour)    None Given

Hi there!
I had some pecan seedlings these last months.
They started to have strange stains on leaves, they dried and the plants died.
I bought a cherry plant and I put it in a pot where there was one of these pecans seedlings.
After a week I noticed the same stains also on cherry leaves.
Now, what can it be?
What can I do?
Thank you everyone!


Posted by: Mirko (2 points) Mirko
Posted: September 6, 2016




Answers

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I think some of the problem is sooty mold which is a build up of fungi on the leaf surface. It is often stimulated by aphids (plant feeding insects) and the sugar that they secrete onto the leaf.

"Sooty molds don’t infect plants but grow on surfaces where honeydew deposits accumulate. Honeydew is a sweet, sticky liquid that plant-sucking insects excrete as they ingest large quantities of sap from a plant. Because the insect can’t completely utilize all the nutrients in this large volume of fluid, it assimilates what it needs and excretes the rest as “honeydew.” Wherever honeydew lands—e.g., leaves, twigs, fruit, yard furniture, concrete, sidewalks, or statuary—sooty molds can become established.

Although sooty molds don’t infect plants, they can indirectly damage the plant by coating the leaves to the point that it reduces or inhibits sunlight penetration. Without adequate sunlight, the plant’s ability to carry on photosynthesis is reduced, which can stunt plant growth. Coated leaves also might prematurely age (senesce) and die, causing premature leaf drop."
http://ipm.ucanr.edu/PMG/PESTNOTES/pn...

Please check to see if you have aphids on the leaves- I didnt see them but it can be hard with a photo.


It is also promoted by wet conditions.


Posted by: David Hughes (66 points) David Hughes
Posted: September 8, 2016


Mirko commented,
Thank you for your answer but it is not sooty mold. I knew sooty mold but this is not it.
over 7 years ago.

David Hughes commented,
OK. Does it feel like a growth of fungus on the surface? Or does the discoloration seem to be inside the leaf?
over 7 years ago.

Mirko commented,
It seems inside! It is like the leaf veins have a dark liquid inside, it's strange. Then the leaf turns brown/black and the borders too start to blackened.
over 7 years ago.



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