Certified Arborist Test Diagnosis and Treatment 4

Question 1

A tree exhibits chlorosis (yellowing) only on new growth while older leaves remain green. Which nutrient deficiency is most likely?

Accepted Answer

Iron

Answer

Iron deficiency causes interveinal chlorosis on new growth first because iron is immobile in the plant. Nitrogen deficiency, by contrast, affects older leaves first since nitrogen is mobile.

Question 2

What is the recommended approach for treating a tree with bacterial wetwood (slime flux)?

Accepted Answer

No treatment is typically recommended; maintain overall tree health

Answer

There is no effective cure for bacterial wetwood. The current best practice is to maintain overall tree vigor through proper watering, mulching, and fertilization. Drain tubes are no longer recommended.

Question 3

Which diagnostic tool uses sound waves to detect internal decay in trees?

Accepted Answer

Sonic tomograph

Answer

Sonic (acoustic) tomography sends sound waves through the trunk and measures their speed. Decayed wood transmits sound more slowly, creating a map of internal condition.

Question 4

A tree has mushroom fruiting bodies at its base. What does this most likely indicate?

Accepted Answer

Root or butt rot caused by wood-decay fungi

Answer

Mushrooms at the base of a tree typically indicate wood-decay fungi decomposing root or trunk wood. This can severely compromise structural integrity and indicates advanced decay.

Question 5

When treating a tree for nutrient deficiency, which application method provides the fastest response?

Accepted Answer

Foliar spray

Answer

Foliar sprays deliver nutrients directly to leaf tissue and are absorbed quickly, providing the fastest visual response. However, the effects are temporary compared to soil-based treatments.

Certified Arborist Test Practice Test

Certified Arborist Test Practice Test

Certified Arborist Test Diagnosis and Treatment 4