Cyclocephala

Cyclocephala is a genus of beetles belonging to the family Scarabaeidae within the order Coleoptera. While adult beetles are generally harmless, the larval stage, commonly referred to as white grubs, is recognized as a major soil pest that feeds extensively on the root systems of various plants.

These pests primarily target turfgrass, pastures, and young crops. Because the larvae live entirely underground, their presence is often not detected until significant damage has already occurred, such as thinning grass, dead patches, or areas where the turf can be easily pulled back like a rug.

The life cycle of Cyclocephala involves a complete metamorphosis. Adult females lay eggs in the soil, which hatch into C-shaped grubs. These larvae feed on organic matter and living roots throughout their development stages, which typically occur during the warmer months, causing the most damage during late summer.

The damage caused by these grubs is physiological and mechanical. By severing the roots, they prevent the plant from absorbing water and nutrients, leading to rapid wilting and chlorosis. Heavy infestations can lead to total destruction of lawns, which may also attract predators like birds or mammals that dig up the turf looking for grubs.

Control strategies for Cyclocephala require both preventative and reactive measures. Cultural practices, such as maintaining healthy, dense turf through proper irrigation and aeration, can reduce susceptibility. Chemical control involving soil-applied insecticides is most effective when timed with the early stages of larval development, while biological control agents like parasitic nematodes provide an environmentally friendly alternative.