June beetles (genus Phyllophaga, family Scarabaeidae) are a large and diverse group of scarab beetles with over 150 species in North America. In Arizona, several species are common, particularly in areas with irrigated lawns, gardens, and agricultural land. Adults are large (3/4–1 inch), robust, reddish-brown to dark brown beetles that are strongly attracted to lights on warm summer nights — they are the large, buzzing beetles that crash into porch lights and windows from May through July. Adults feed on tree foliage but cause relatively minor damage. The real damage is done by the larvae: large, C-shaped white grubs (up to 1.5 inches) that live in the soil and feed voraciously on the roots of grasses, garden plants, vegetables, and ornamentals. Larvae spend one to three years underground, depending on the species, before pupating and emerging as adults. In lawns, grub feeding severs grass roots, causing irregular brown patches that pull up like a loose carpet. In gardens, grubs can destroy the root systems of vegetables and ornamental plants. Grub infestations also attract secondary predators — skunks, raccoons, and birds will dig up lawns to feed on grubs, causing additional damage.
👁Warning Signs
Large reddish-brown beetles at lights in May–July. Irregular brown patches in lawn that pull up easily (severed roots). C-shaped white grubs (up to 1.5 inches) found when digging in soil. Secondary damage: digging by skunks, raccoons, or birds feeding on grubs.
⚠Health & Property Risks
Lawn destruction from root feeding. Damage to garden vegetables and ornamental plants. Secondary damage from predators digging for grubs. Agricultural damage in irrigated fields.
Prevention Tips
Maintain healthy, deep-rooted turf — less susceptible to grub damage. Reduce outdoor lighting that attracts adults. Apply preventive grub control insecticides in late spring before eggs hatch.
🛡Professional Treatment
Apply soil insecticides (imidacloprid, chlorantraniliprole) in late spring to early summer when young grubs are near the surface. Biological controls: Bacillus thuringiensis var. japonensis or beneficial nematodes (Heterorhabditis bacteriophora) for organic management.
Frequently Asked Questions — June Beetle
The June Beetle (Phyllophaga spp.) is adults reddish-brown to dark brown; larvae cream-white c-shaped grubs with brown head capsule and typically measures Adults 3/4–1 inch; larvae (grubs) up to 1.5 inches. June beetles (genus Phyllophaga, family Scarabaeidae) are a large and diverse group of scarab beetles with over 150 species in North America. In Arizona, several species are common, particularly in ar.
The June Beetle poses a moderate risk. Lawn destruction from root feeding. Damage to garden vegetables and ornamental plants. Secondary damage from predators digging for grubs. Agricultural damage in irrigated fields.
In Arizona, june beetles are most often encountered in the following situations: Large reddish-brown beetles at lights in May–July. Irregular brown patches in lawn that pull up easily (severed roots). C-shaped white grubs (up to 1.5 inches) found when digging in soil. Secondary damage: digging by skunks, raccoons, or birds feeding on grubs.
The June Beetle is most active during: Adults May–July; larvae (grubs) active in soil spring through fall, overwintering deep underground. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.
Maintain healthy, deep-rooted turf — less susceptible to grub damage. Reduce outdoor lighting that attracts adults. Apply preventive grub control insecticides in late spring before eggs hatch.
Apply soil insecticides (imidacloprid, chlorantraniliprole) in late spring to early summer when young grubs are near the surface. Biological controls: Bacillus thuringiensis var. japonensis or beneficial nematodes (Heterorhabditis bacteriophora) for organic management.
Left unchecked, June Beetle infestations can cause significant structural or food-storage damage over time. Lawn destruction from root feeding. Damage to garden vegetables and ornamental plants. Secondary damage from predators digging for grubs. Agricultural damage in irrigated fields. Early detection and professional treatment are the most cost-effective approach — contact Pest Control Bros for an inspection at the first sign of activity.
Dealing with June Beetle?
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