Olson Tree Care
Olson Tree Care in Des Moines, Iowa has found that Foliar Analysis gives you the facts. While in Iowa only farmers use laboratory analysis for nutrient content of plants, many arborists have found it to be an amazing asset.
Without tissue testing it becomes a guessing game, that often makes the best of arborists throw stuff at the tree, seeing what works.
Case in point....
Customer calls for Tree Service with a black alder (Alnus glutinosa) that wilted and looks near dead after having been somewhat healthy last year. Visual analysis led the Arborist at Olson Tree Care to 2 areas... abiotic (toxicity) and biotic (pathogen such as Phytophthora alni.)
With treatment options costly for Phytophthora we did not want to go in that direction without ruling out nutrient toxicity. So...... for a small fee we sent a tissue sample to a lab.
The results came back high in boron, copper, iron, sulfur, magnesium with calcium and nitrogen excessively high. Testing found the culprit and provided an exact diagnosis. Turns out the neighbor had burned the lawn with fertilizer in spring right on the property line next to the tree. Leaching was recommended before results had come in just in case.