Flea Beetles
Chrysomelidae (Alticini)
📖 Description
Flea beetles are common garden pests that get their name from their remarkable jumping ability, which rivals that of fleas relative to their size. While each individual beetle causes minimal damage, their collective feeding creates a distinctive shot-hole pattern in leaves that can severely damage seedlings and young plants. Established plants can usually tolerate moderate feeding, but heavy infestations on young transplants can be devastating. Flea beetles are particularly problematic on brassicas and eggplant, where they can stunt or kill young plants. Their jumping ability makes them difficult to control with contact sprays.
⚠️ Symptoms to watch for
- Numerous small round holes in leaves (shot-hole appearance),Pitting and small holes in leaf surfaces,Damaged cotyledons on emerging seedlings,Wilting or death of young transplants,Stunted growth in severely affected plants,Feeding damage concentrated on older, lower leaves
🩹 Treatment
- Apply diatomaceous earth around plant bases (organic),Use floating row covers immediately after planting (organic),Spray with spinosad-based insecticide (organic),Apply neem oil as a feeding deterrent (organic),Use carbaryl (Sevin) dust or spray (chemical),Apply permethrin to foliage (chemical)
🌿 Organic treatments
- Apply diatomaceous earth around plant bases,Use floating row covers immediately after planting,Spray with spinosad-based insecticide,Apply neem oil as a feeding deterrent
🧪 Chemical treatments
- Use carbaryl (Sevin) dust or spray,Apply permethrin to foliage
🛡️ Prevention
- Use floating row covers on seedlings and transplants,Plant trap crops like radishes or mustard at garden edges,Delay planting until after peak adult emergence,Keep garden area free of weed hosts in early spring,Till soil in fall to destroy overwintering adults,Use yellow sticky traps for monitoring
🪴 Affected plants
- Eggplant,Radishes,Cabbage,Broccoli,Tomatoes,Peppers,Mustard Greens
🦋 Natural predators
- Ground Beetles,Lacewings,Spiders
🌱 Host plants
- Brassica spp.,Solanum lycopersicum,Raphanus sativus
🔄 Lifecycle
- Adults overwinter in leaf litter and soil debris, emerging in spring to feed on weeds and early crops.
- Females lay eggs on soil at the base of host plants or on roots.
- Eggs hatch in 5-12 days.
- Larvae feed on roots and root hairs for 2-3 weeks, then pupate in soil.
- Adults emerge in 1-2 weeks.
- There are 1-2 generations per year, with the first generation causing the most damage to spring plantings.
📅 Season
- Spring to Early Summer (most damaging), can continue through Fall
🔎 Appearance
- Tiny, shiny, oval beetles in black, bronze, metallic blue, or striped patterns.
- Named for their enlarged hind legs that allow them to jump like fleas when disturbed.
- Very active and quick to flee.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- North America
- Europe
- Asia
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