ISA Certified Arborist Practice Exam

What can be a consequence of nutrient burn in trees?

1. Enhanced fruit uptake

2. Increased disease resistance

3. Tree stress and vulnerability to pests

4. Greater leaf retention

The correct answer is: Tree stress and vulnerability to pests

Nutrient burn occurs when there is an excess of nutrients, particularly nitrogen, which leads to a concentration of salts in the soil. This condition can cause significant stress to the tree, resulting in symptoms like leaf scorch, browning of leaf edges, and overall reduced vigor. The stress from nutrient burn impairs the tree's ability to uptake water and essential nutrients, weakening it and making it more susceptible to diseases and pest infestations. As the tree's metabolic processes are disrupted, its defenses against pathogens diminish, leading to an increased vulnerability to both insects and diseases. Therefore, the consequence of nutrient burn can manifest as tree stress and an increased likelihood of pest issues.