Pin Oak - Ask Extension
we have a pin oak, over 10 years in the ground. the leaves are redish this year. all previous years they've been green at this stage an al the other ...
Knowledgebase
Pin Oak #868542
Asked May 15, 2024, 12:49 PM EDT
we have a pin oak, over 10 years in the ground. the leaves are redish this year. all previous years they've been green at this stage an al the other pin oaks have green leaves. is it perhaps a nitrogen deficiency?
Monroe County Michigan
Expert Response
Good Morning,
Chlorosis in pin oaks is usually due to a deficiency of iron in the leaves. Iron is important for chlorophyll synthesis in plants, so when it is deficient, leaves cannot make chlorophyll, resulting in a yellow appearance. Chlorosis of pin oaks is typically associated with alkaline soil pH – pH greater than 7. See attached article.
You can have an arborist come out and assess your tree. TreesAreGood.org
I suggest a soil test to determine if your soil is missing any nutrients. Home | MSU Soil Test
Severe chlorosis in pin oaks - MSU Extension
I hope this helps. Thanks for using our service.
Chlorosis in pin oaks is usually due to a deficiency of iron in the leaves. Iron is important for chlorophyll synthesis in plants, so when it is deficient, leaves cannot make chlorophyll, resulting in a yellow appearance. Chlorosis of pin oaks is typically associated with alkaline soil pH – pH greater than 7. See attached article.
You can have an arborist come out and assess your tree. TreesAreGood.org
I suggest a soil test to determine if your soil is missing any nutrients. Home | MSU Soil Test
Severe chlorosis in pin oaks - MSU Extension
I hope this helps. Thanks for using our service.
The leaves aren't yellow, they are red.
Good Afternoon,
Your tree seems to be suffering from nutrient deficiencies. Certain nutrient deficiencies can be identified by characteristic symptoms. Nitrogen deficiencies are often characterized by leaf chlorosis. Leaves deficient in phosphorus may take on a purplish
cast. Trees that are deficient in potassium may show marginal necrosis. However, not all nutrient deficiency symptoms are unique and similar symptoms may be caused by different elements. For example, interveinal chlorosis can indicate magnesium, manganese or iron deficiencies. Moreover, some symptoms that resemble nutrient deficiencies may be caused by pest-related issues or other environmental stresses such as drought stress or poor soil drainage. Therefore, visual deficiency
symptoms should be viewed as “one piece of the puzzle” when identifying potential nutrient problems and are best used in conjunction with soil or foliar testing
Nutrition_and_fertilization_BertCreggfinal.pdf (msu.edu)
I suggest you have a soil test to verify what your soil could be lacking. Home | MSU Soil Test
Occasionally, visual symptoms and soil testing are not enough to fully diagnose a problem. In these cases, determining the concentration of nutrient elements in leaf tissue may be needed. Foliar testing is available through the MSU Soil and Plant Nutrient
Laboratory. Leaf samples should be collected from recent, fully-expanded leaves. For deciduous trees and shrubs, leaves should be collected in mid-summer (July-August); conifers should be sampled in early fall (September-October). Consult with the analysis lab before collecting samples for additional directions
on how to collect samples and the amount of foliage needed for analysis.
6_Fine tune fertilizer with foliar sampling.pdf (msu.edu)
Please let me know if this answers your question.
Your tree seems to be suffering from nutrient deficiencies. Certain nutrient deficiencies can be identified by characteristic symptoms. Nitrogen deficiencies are often characterized by leaf chlorosis. Leaves deficient in phosphorus may take on a purplish
cast. Trees that are deficient in potassium may show marginal necrosis. However, not all nutrient deficiency symptoms are unique and similar symptoms may be caused by different elements. For example, interveinal chlorosis can indicate magnesium, manganese or iron deficiencies. Moreover, some symptoms that resemble nutrient deficiencies may be caused by pest-related issues or other environmental stresses such as drought stress or poor soil drainage. Therefore, visual deficiency
symptoms should be viewed as “one piece of the puzzle” when identifying potential nutrient problems and are best used in conjunction with soil or foliar testing
Nutrition_and_fertilization_BertCreggfinal.pdf (msu.edu)
I suggest you have a soil test to verify what your soil could be lacking. Home | MSU Soil Test
Occasionally, visual symptoms and soil testing are not enough to fully diagnose a problem. In these cases, determining the concentration of nutrient elements in leaf tissue may be needed. Foliar testing is available through the MSU Soil and Plant Nutrient
Laboratory. Leaf samples should be collected from recent, fully-expanded leaves. For deciduous trees and shrubs, leaves should be collected in mid-summer (July-August); conifers should be sampled in early fall (September-October). Consult with the analysis lab before collecting samples for additional directions
on how to collect samples and the amount of foliage needed for analysis.
6_Fine tune fertilizer with foliar sampling.pdf (msu.edu)
Please let me know if this answers your question.
Very helpful. Thanks. I have ordered a soil test kit. I'll start there.