ISA Certified Arborist Practice Exam

What is a common tree pest that affects various tree species?

1. Striped beetle

2. Emerald ash borer

3. Tree aphid

4. Dust mite

The correct answer is: Emerald ash borer

The emerald ash borer is particularly noted for its devastating impact on ash tree populations across North America. This invasive pest, which originates from Asia, targets various species of ash trees, leading to significant mortality and decline in affected areas. The larvae bore into the tree's cambial layer, disrupting the transport of nutrients and water, which can ultimately result in the tree's death. The importance of identifying the emerald ash borer lies not only in its direct effect on tree health but also in the broader ecological consequences. The loss of ash trees due to this pest can alter forest ecosystems, affecting other species and the overall health of the environment. While other pests such as striped beetles, tree aphids, and dust mites can also affect trees, their impact tends to be more limited in scope or targeted at specific tree types. The emerald ash borer's ability to cause widespread destruction makes it a particularly notable pest in the field of arboriculture.