What is a common group of insects that attack pear trees?

The correct group of insects that commonly attack pear trees includes the European red mite, codling moth, cutworm, and leafroller. The European red mite is known for causing damage by feeding on leaf tissue, leading to stippling and potential leaf drop. The codling moth is particularly notorious as it lays eggs on the fruit; the larvae then bore into the fruit, making it unmarketable. Cutworms can harm young pear trees by cutting through stems near the soil line, and leafrollers can damage foliage by rolling leaves and feeding within them, which can lead to reduced photosynthesis and overall tree health.

Each of these pests has specific behaviors and life cycles that directly impact the vitality of pear trees, making the identification and understanding of these pests crucial for effective pest management in orchard settings. Other groups listed do not include insects that are as directly damaging to pear trees as those in the correct choice.