🐛 Pests, Disease & Critters
🐛 Pests & Disease
The common problems you'll actually run into in Northwest Ohio — with organic-first solutions. For deeper diagnosis, Ohio State University Extension's free Insects & Pests and Plant Disease fact sheets are excellent.
🐛 Aphids — Tiny green, black, or pink insects clustered on new growth; leaves curl and turn sticky. Blast them off with water, then spray insecticidal soap or neem on the leaf undersides. Encourage ladybugs, repeat every 5–7 days, and go easy on high-nitrogen feed.
🕷 Spider Mites — Fine yellow stippling and faint webbing in hot, dry weather. Rinse the foliage (they hate moisture) and spray insecticidal soap or horticultural oil underneath. Keep plants watered in heat.
🪲 Japanese Beetles — Metallic copper-green beetles that skeletonize leaves in early-to-mid summer. Hand-pick into soapy water in the cool morning; skip pheromone traps — they only attract more.
🐌 Slugs & Snails — Ragged holes and slimy trails, worst in shade and after rain. Scatter iron-phosphate bait (much safer than older baits, but keep pets from eating it), hand-pick at dusk, and water in the morning so the soil dries by night.
🍂 Powdery Mildew — White, powdery coating in humid, crowded spots. Improve airflow, remove affected leaves, and spray a potassium-bicarbonate or horticultural-oil product. Always water at the soil line.
💧 Root Rot — Wilting that won't recover, yellowing, mushy roots — caused by soggy soil. Let it dry out, improve drainage, and use pots with drainage holes; water only when the top inch is dry.
🐛 Bagworms — Spindle-shaped 1½–2½ inch 'bags' hanging from evergreens like Thuja. Hand-pick and destroy the bags from fall through early spring, before the eggs hatch in late May.
🍃 Leaf Spot & Blight — Brown or black spots that spread in wet weather. Remove affected leaves (don't compost), open up airflow, and water at the base.
🦟 Whitefly — Tiny white flies that scatter when you brush a leaf; sticky honeydew follows. Spray insecticidal soap or neem underneath and hang yellow sticky traps.
Not sure what you're looking at? Snap a photo and send it to us on Facebook Marketplace — we'll help you ID it.
🧴 How to Treat Pests Without Killing the Good Bugs
Most insects in your garden are harmless or helpful. A few smart habits let you control pests and still protect bees, butterflies and beneficial insects.
1. Identify the pest first. Not every bug is a problem, and a few aphids actually feed the ladybugs that keep them in check. Send us a photo if you're not sure.
2. Start with the gentlest fix. Blast aphids and mites off with a strong spray of water, hand-pick beetles and hornworms, use row covers and yellow sticky traps.
3. Spot-treat — don't blanket spray. Spray only the plants, and the parts of the plant, where pests are.
4. Choose low-impact products. Insecticidal soap, horticultural oil and neem kill soft-bodied pests on contact and leave little residue once dry. Bt kurstaki (Btk) affects only caterpillars — great for cabbage worms and hornworms, but keep it off milkweed and other butterfly host plants.
5. Spray when bees aren't flying. Early morning or, better, at dusk, so products dry before bees return. Spinosad, for example, is very toxic to bees while wet but low-risk once dry.
6. Never spray open flowers. Mow or snip off flowering weeds before you spray nearby.
7. Mind the weather. Spray on calm days, never in wind, and skip soaps and oils above about 85°F or in full midday sun — they can burn leaves.
8. Avoid broad-spectrum and systemic insecticides. Products such as carbaryl, pyrethroids (bifenthrin, permethrin, and zeta-cypermethrin in most Sevin products) and neonicotinoids (imidacloprid) kill beneficial insects and pollinators along with the pests.
9. Read the label. Follow the rate, timing and safety directions exactly — more is never better.
At Poe's we use beneficial insects and organic-approved (OMRI-listed) products first, and we're happy to tell you what has worked for us.
🦌 Deer, Rabbits & Critters
Four-legged visitors can undo a season's work overnight. Since they aren't insects, the winning strategy is a physical barrier plus removing the food and cover that draw them in — and rotating methods, because no repellent works forever.
🦌 Deer — Ragged, torn-off bites on hostas, daylilies, tender shoots, and arborvitae; damage shows up overnight. An 8-ft fence is the only truly reliable barrier; otherwise rotate repellent sprays (reapply after rain), motion-activated sprinklers, and cages on your favorites. Plant aromatic, deer-resistant choices — lavender, rosemary, sage, thyme, oregano, dianthus — and switch methods through the season.
🐰 Rabbits — Clean, angled (45°) clips on young stems and flowers; bark gnawed near the ground in winter. A 2-ft chicken-wire fence with the bottom buried keeps them out. Use trunk guards in winter, rotate repellents, and clear the brush piles where they hide.
🐀 Voles — Surface runways in the lawn, gnawed bark at the base of trees and shrubs, and plants wilting from chewed roots. Keep a mulch-free ring around trunks, sink hardware-cloth guards a few inches into the soil, and cut back ground cover in fall. Never pile mulch against stems.
🐭 Mice & Chipmunks — Nibbled seeds, bulbs, and low fruit; small burrows; nests in stored pots. Tidy up debris and spilled seed, use hardware-cloth barriers around bulbs, and store seed in sealed containers.
🚨 Spotted Lanternfly — Spot It & Stop It
Spotted lanternfly is an invasive pest now established in Ohio. It rarely kills healthy trees, but it can kill grapevines, and it weakens plants, coats everything in sticky "honeydew," and spreads fast. Learn to recognize it and destroy it on sight.
How to identify it
• Egg masses (fall–spring): 1–1½" gray, waxy, mud-like smears on tree bark, stones, outdoor furniture, or vehicles.
• Nymphs (May–summer): small and black with white spots; older nymphs turn bright red with white spots.
• Adults (summer–fall): about 1" long, gray forewings with black spots and flashy red hind wings that show when they jump or fly.
Destroy egg masses (Sept–May)
• Scrape them off with a plastic card or putty knife into a bag or container of rubbing alcohol or hand sanitizer, and leave them in it.
• Or smash them firmly — press the whole mass until every egg bursts.
• In winter or just before bud-break, egg masses on trees can be treated with horticultural oil.
Treat nymphs & adults
• When numbers are low, just swat or stomp them.
• Circle traps on tree trunks work best; avoid sticky bands without guards, which can catch birds.
Quarantine — don't give it a ride
• Ohio is under a spotted lanternfly quarantine. Before moving firewood, plants, outdoor furniture, or vehicles, check them for egg masses and adults so you don't carry it to a new area.
• Ohio no longer needs sightings reported (it's established), but you're encouraged to kill it whenever you can.
Official guidance: Ohio Dept. of Agriculture — SLF Management ↗ · Egg-mass removal — Penn State Extension ↗
📖 Garden Guides — 5 parts
1. Seasons, Planting & Feeding
2. Plant Terms & Choosing Plants
3. Pests, Disease & Critters (you are here)
4. Beneficial Insects & Pollinators
5. Composting & Smart Plant Buying
🌱 Also: Zone Finder & Plant Care Guides