Planning reference

Slugs vs Flea Beetles

Separate slug slime trails and ragged night chewing from flea beetle shot holes before drying beds, changing mulch, covering rows, spraying, or re-sowing seedlings.

What each seedling leaf signal means

Slugs
Slugs are soft-bodied mollusks that rasp irregular holes in leaves, stems, seedlings, fruit, and tender growth. They feed mostly at night or early morning and leave slime trails when moisture and shelter are present.
Flea beetles
Flea beetles are tiny jumping leaf beetles that chew small shot holes or shallow pits in seedling leaves, cotyledons, and tender vegetable foliage, especially on brassicas, eggplant, tomato, potato, pepper, beets, spinach, turnips, and radishes.
Slime trails, ragged holes, and night feeding
Shiny slime, ragged irregular holes, shredded edges, damage that expands after wet nights, and pests found under boards, mulch, weeds, or plant debris point toward slugs before assuming beetle feeding.
Shot holes, shallow pits, and jumping adults
Peppered cotyledons, rounded holes, shallow pits, and tiny dark, bronze, striped, or metallic beetles that jump when leaves are tapped point toward flea beetles rather than night-feeding slugs.
Moist hiding places, seedlings, and row-cover timing
Slug decisions hinge on wet shelter, watering timing, dense residue, mulch, boards, and nighttime scouting. Flea beetle decisions hinge on seedling age, host crop, weeds, plant vigor, and row covers installed before adults arrive.

Seedling leaf scouting workflow

Separate the damage pattern before treating
Do not treat every ragged, pitted, or shot-holed seedling leaf as the same pest problem; scout at night or early morning for slugs, slime trails, cool moist hiding places, and irregular chewing, then tap damaged seedlings for tiny jumping adults, punched-through holes, shallow pits, seedling age, weeds, row-cover history, watering timing, and plant stress before treating slugs or flea beetles.
Scout in two different windows
Use a flashlight after dark or lift boards and mulch early in the morning for slugs, then tap sunny damaged leaves during the day and watch for flea beetles jumping away.
Separate surface residue from missing tissue
Slug chewing often leaves ragged edges and slime nearby. Flea beetle feeding leaves many small holes or pits with no slime and usually concentrates on young leaves or cotyledons.
Change habitat for the pest you confirm
For slugs, reduce wet hiding places, dense weeds, boards, and unnecessary evening irrigation before using traps or baits. For flea beetles, remove host weeds, keep seedlings vigorous, and use row covers before adults are trapped inside.
Keep moisture and cover decisions practical
Do not dry seedlings into stress just to suppress slugs, and do not cover rows after flea beetles are already feeding underneath. Match watering, mulch, and cover timing to the confirmed pest and crop stage.

Use these paths

Source basis