What do grubs primarily feed on?

Grubs primarily feed on plant roots, which is crucial for their growth and development. They are the larval stage of various beetle species, including June beetles and chafers. Their feeding habits are specifically adapted to consume organic matter found near the soil surface, often targeting the roots of grasses and other plants. This can lead to significant damage in lawns and gardens, as their root-feeding behavior can disrupt the plant's ability to absorb nutrients and water, potentially leading to dead patches in turf or reduced vigor of ornamental plants.

The other options pertain to different feeding habits: flowers, wood, and leaves are associated with various other pests or stages of insects in different life cycles. Grubs do not feed on these materials, as their mouthparts and digestive systems are structured for consuming softer organic plant matter found in or around the soil. Understanding this feeding preference is essential for effective pest management strategies targeting beetle larvae.