• Eggs are laid in the soil during summer.
• Larvae hatch and feed on roots in late summer and autumn, overwintering in the soil.
• Pupation occurs in late spring, with adults emerging in early summer to begin feeding and reproduction

The larval stage causes the most economic damage, making it the key target for biological control.

Asiatic garden beetle larvae destroy root systems, leading to wilting, stunted growth, and plant death. Turfgrass infested with grubs lifts easily from the soil. Adults feed on leaves and flowers, causing ragged edges and defoliation, particularly in ornamentals and nursery crops.

• Monitor adult activity with light traps during summer.
• Sample soil regularly to detect larvae and assess risk levels.
• Maintain healthy soils and crop rotations to discourage buildup.

The most effective and sustainable way to control Asiatic garden beetle larvae is by applying beneficial nematodes. These naturally occurring soil organisms are highly specialized predators of beetle larvae. Once applied, they actively seek out the larvae, penetrate them, and release symbiotic bacteria that quickly kill the host. After reproducing inside the larvae, new nematodes are released into the soil to continue the cycle, providing ongoing protection.

The beneficial nematode Heterorhabditis bacteriophora (Capyphor) is proven highly effective against Asiatic garden beetle grubs, actively searching for larvae in the root zone. Apply nematodes when larvae are young and actively feeding (late summer to early autumn, or spring before pupation). Ensure the soil is moist before, during, and after application to help nematodes move through soil pores and find larvae.