Chafer Grubs (June Bugs)
Phyllophaga spp.
📖 Description
Chafer grubs, the larval stage of June bugs and May beetles, are among the most widespread and damaging lawn pests in temperate regions. The C-shaped white grubs feed on grass roots just below the soil surface, severing the root system and causing large patches of lawn to turn brown and die. Heavily infested turf can be rolled back like carpet because the root system has been completely destroyed. The secondary damage from skunks, raccoons, and birds digging for grubs is often more destructive than the grubs themselves. Some species have 3-year lifecycles, meaning damage can persist for multiple years from a single generation. Adult beetles feed on tree leaves at night, sometimes causing noticeable defoliation, but it is the root-feeding larvae that cause the most significant economic damage to lawns, sports fields, and pastures.
⚠️ Symptoms to watch for
- Brown, dying patches of lawn that pull up easily like carpet,Skunk, raccoon, or bird damage to lawn as they dig for grubs,C-shaped white grubs found in soil when turf is pulled back,Wilting and stunting of vegetable transplants from root feeding,Adults feeding on tree leaves at night, creating notched edges,Spongy or soft areas in lawn that sink when walked on
🩹 Treatment
- Apply beneficial nematodes (Heterorhabditis bacteriophora) to soil (organic),Use milky spore (Bacillus popilliae) for long-term grub suppression (organic),Apply neem-based products to soil as grub deterrent (organic),Use insect-parasitic fungi (Beauveria bassiana) (organic),Apply imidacloprid or chlorantraniliprole granules to lawn in early summer (chemical),Use trichlorfon for quick knockdown of existing grub populations (chemical)
🌿 Organic treatments
- Apply beneficial nematodes (Heterorhabditis bacteriophora) to soil,Use milky spore (Bacillus popilliae) for long-term grub suppression,Apply neem-based products to soil as grub deterrent,Use insect-parasitic fungi (Beauveria bassiana)
🧪 Chemical treatments
- Apply imidacloprid or chlorantraniliprole granules to lawn in early summer,Use trichlorfon for quick knockdown of existing grub populations
🛡️ Prevention
- Maintain healthy turf with proper mowing height (3+ inches),Avoid overwatering which makes soil softer for grub feeding,Apply beneficial nematodes preventively in late summer,Use resistant turfgrass varieties like tall fescue in grub-prone areas,Monitor for adult beetle activity in May-June using light traps,Reduce outdoor lighting during beetle flight season to reduce egg-laying in nearby turf
🪴 Affected plants
- Lawns,Turfgrass,Corn,Potatoes,Strawberries,Root Vegetables,Ornamental Trees
🦋 Natural predators
- Birds,Moles,Beneficial Nematodes,Skunks
🌱 Host plants
- Various turf grasses,Root crops,Ornamental plants
🔄 Lifecycle
- Adults emerge in May-June and are active at night, feeding on tree foliage and mating.
- Females lay 50-100 eggs in soil, primarily in moist, grassy areas.
- Eggs hatch in 2-3 weeks.
- Grubs feed on roots and organic matter in soil through fall, then move deeper to overwinter.
- In spring, grubs return to the root zone and feed before pupating in May.
- Most species have a 1-3 year lifecycle depending on the species and climate.
- Adults live 2-4 weeks and are strongly attracted to lights.
📅 Season
- Spring to Fall (grubs); May-July (adults); Year-round in soil (grubs at various depths)
🔎 Appearance
- Larvae are fat, C-shaped, creamy-white grubs with brown heads, three pairs of legs near the head, and a darker gray area at the rear end.
- Adults are robust, reddish-brown to dark brown beetles that are clumsy fliers attracted to lights at night, commonly called June bugs or May beetles.
💥 Damage level
- High
🔁 Reproduction rate
- Slow
🗺️ Geographic regions
- North America
- Europe
- Asia
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