What type of damage do larvae of cabbage loopers cause to plants?

The correct choice accurately reflects the feeding behavior of cabbage looper larvae. These larvae are known to be voracious feeders that primarily target the leaves of plants, particularly those in the Brassica family, such as cabbage, broccoli, and kale. Their feeding method involves chewing through the leaf tissue, which results in the characteristic ragged-edged holes that are a clear indicator of their presence. This leaf damage can significantly affect the plant's health, as it reduces the surface area available for photosynthesis and can lead to increased susceptibility to disease.

The other options depict types of damage that are not typical of cabbage looper larvae. For instance, while some pests may damage stems, cabbage loopers are not known for such behavior. Similarly, the larvae do not feed on roots, so options related to depleting nutrients from the root system or attracting other pests do not accurately describe the direct effects of cabbage looper larvae on plants. Understanding the specific behavior of pests like cabbage loopers is crucial for proper pest management and control strategies in agricultural practices.