Florida Garden Pests

Florida grows bugs the way it grows everything else — enthusiastically, year-round, and with no respect for your plans. Our winters don’t kill pests; they just give them a light jacket. Here’s the rogues’ gallery, what actually works against each one, and the honest truth about where worm castings fit in (spoiler: they’re the training montage, not the superhero).

The rogues’ gallery

Aphids — the tiny vampires

Clusters of soft-bodied insects on new growth and buds, secreting sticky honeydew that grows sooty mold. What works: a hard blast of water knocks most of them off (they’re terrible at re-climbing); insecticidal soap or neem oil for heavy infestations; and patience — ladybugs, lacewings, and parasitic wasps show up if you don’t nuke the area first. In Florida they never really leave, so this is management, not eradication.

Whiteflies — the puff of doom

Shake an infested plant and a cloud of tiny white moths rises like a bad magic trick. They suck sap and spread viruses. What works: reflective silver mulch confuses them; neem oil and insecticidal soap on the leaf undersides where they feed; yellow sticky traps for monitoring. Bad infestations on tomatoes and peppers may mean pulling the plant — sometimes the bravest IPM move is the compost pile.

Tomato hornworms — the hungry giants

Four-inch green caterpillars that can strip a tomato plant overnight and hide in plain sight. What works: handpicking (go out at night with a UV blacklight — they glow, and it feels like a sci-fi mission); Bt (Bacillus thuringiensis, a bacteria that only harms caterpillars) sprayed on foliage; and parasitic braconid wasps, whose cocoons look like tiny white rice grains on the worm’s back — if you see those, leave that worm alone, it’s a wasp nursery now.

Squash vine borers — the heartbreakers

The moth lays eggs at the stem base; larvae tunnel inside and the whole plant wilts overnight despite wet soil. What works: floating row covers over young plants (remove at flowering for pollination, or hand-pollinate); wrapping the lower stem in foil; planting a second succession so borers only get the first round; and growing resistant Cucurbita moschata types (butternut, seminole pumpkin — a Florida native that shrugs off borers like a local).

Root-knot nematodes — the invisible Florida menace

Microscopic soil worms that knot up roots into galls, stunting everything. Sandy Florida soil is their paradise. What works: soil solarization (clear plastic over moist soil for 4–6 weeks in summer — Florida sun finally pulling its weight); resistant varieties (look for “N” on tomato labels); crop rotation; and adding lots of organic matter, which supports the soil food web that keeps nematodes in check. Marigolds are the folk remedy — the honest science is mixed, but they don’t hurt and the flowers are pretty.

Lubber grasshoppers — the tanks

Big, slow, black-and-yellow-and-red, and toxic — nothing eats them, which they know. What works: handpicking (they’re slow; it’s basically a stroll); Nolo bait or spinosad on the tiny black nymphs in spring, because the adults are nearly indestructible. Squishing adults is legal and encouraged.

Armyworms and cutworms — the night shift

Caterpillars that chew seedlings at the base or march across lawns and gardens. What works: Bt for the caterpillars; spinosad as the stronger organic option; cardboard collars around seedling stems against cutworms.

Snails and slugs — the slime brigade

Florida’s humidity is a five-star resort for mollusks. What works: iron phosphate bait (pet- and wildlife-safe, unlike the old metaldehyde stuff); beer traps; copper tape around pots; and reducing their daytime hiding spots — boards, dense groundcover, and debris near beds.

The castings connection (honest version)

Let’s be straight: worm castings will not kill a hornworm. What they do is grow vigorous, resilient plants — deep roots, thick cell walls, fast recovery — and vigorous plants survive pest encounters that kill stressed ones. There’s also real (if early) research suggesting that biologically active soils support plants’ own defense responses. Think of castings as the training montage, not the superhero landing: they don’t win the fight for your plant, but they make sure your plant shows up in shape.

The IPM mindset

Integrated Pest Management, the unsexy system that actually works:

1. Identify before you spray. Half of “pest” panics are beneficial insects. That weird wasp is probably on your side.
2. Least toxic first. Water blast > handpick > soap/neem > Bt/spinosad > synthetics you hopefully never need.
3. Tolerate some damage. A garden with zero insect damage is a garden with zero ecosystem. Ten percent leaf loss on a healthy plant is a rounding error.
4. Time your plantings. Florida’s biggest cheat code: plant timing dodge peak pest pressure. Fall tomatoes dodge half the summer horror show.

Keep growing: Healthy soil is pest defense’s foundation — Living Soil for Florida Gardens builds it, the dosage guide tells you how much, and companion planting recruits plant allies. When in doubt, more castings: the shop is right there.

Keep Growing 🌱

Where to go next:

• Florida Growing Seasons
• Living Soil for Florida Gardens
• Sandy-soil guide