Which sign indicates surface insect activity?

The correct answer is indicated by the presence of grass blades that are chewed off or notched. This sign specifically suggests the activity of surface-feeding insects, such as grubs or certain caterpillars, which directly consume parts of the grass itself. When these insects feed on the grass blades, they may leave behind distinct notches or cuts, reflecting their feeding behavior.

This type of damage can often be observed on the upper part of the grass, indicating their presence just beneath or at the surface layer. This makes it an effective visual cue for identifying surface insect activity, as the physical signs are directly correlated with the feeding habits of these pests.

In contrast, wilting turf that doesn't respond to irrigation can indicate a variety of issues such as drought stress, root problems, or disease, rather than specifically surface insect damage. Spongy turf underfoot typically signals issues like excessive thatch or root rot, and presence of holes dug by animals can point to other pests such as moles or skunks rather than insects affecting the surface of the grass.