Apple tree disease - Ask Extension
We have several fruit trees, and over the past weeks, some are showing yellowing leaves .Also, some have splotches on the leaves, as well. What might ...
Knowledgebase
Apple tree disease #877569
Asked July 17, 2024, 2:42 AM EDT
We have several fruit trees, and over the past weeks, some are showing yellowing leaves .Also, some have splotches on the leaves, as well. What might the problem be, and what should we do about it.
We did do 2 sulfur sprays on all the trees; both late winter and early spring. Recently, we did spray neem oil on the trees that apeared Acetn̈n̈
Clatsop County Oregon
Expert Response
Thank you for your question.
This tree appears to be in a grass (lawn?) environment. Possibly this grass has been limed to raise soil pH.
A higher soil pH (>7.5) can restrict Iron absorption necessary for chlorophyll production which can result in chlorosis - https://extension.wsu.edu/chelan-douglas/agriculture/treefruit/irrigation/irrigationandironchloroisinorchards/
It also might indicate a nitrogen deficiency. Nitrogen is very mobile in the soil so it can be leached out of the soil before the plant can absorb it. Try applying a good organic fertilizer high in nitrogen that will take time to break down and therefore remain available longer for the tree to utilize.
Here also is a helpful Oregon State Extension publication "Managing Diseases and Insects in Home Orchards" - https://extension.oregonstate.edu/catalog/pub/ec-631-managing-diseases-insects-home-orchards. Check out the section on apples.
This tree appears to be in a grass (lawn?) environment. Possibly this grass has been limed to raise soil pH.
A higher soil pH (>7.5) can restrict Iron absorption necessary for chlorophyll production which can result in chlorosis - https://extension.wsu.edu/chelan-douglas/agriculture/treefruit/irrigation/irrigationandironchloroisinorchards/
It also might indicate a nitrogen deficiency. Nitrogen is very mobile in the soil so it can be leached out of the soil before the plant can absorb it. Try applying a good organic fertilizer high in nitrogen that will take time to break down and therefore remain available longer for the tree to utilize.
Here also is a helpful Oregon State Extension publication "Managing Diseases and Insects in Home Orchards" - https://extension.oregonstate.edu/catalog/pub/ec-631-managing-diseases-insects-home-orchards. Check out the section on apples.
