Five insects feed on pepper plants in Alabama gardens, according to the Alabama Cooperative Extension System: aphids, corn earworm (also called tomato fruitworm), leaffooted bugs, spider mites, and stink bugs. They show up on different timelines tied to the state’s frost-free window and summer heat, not to a calendar month. Aphids and spider mites build up early and stay all season, leaffooted bugs and stink bugs move in once fruit sets, and corn earworm follows moths drawn to flowering plants.
Which pests attack pepper in Alabama
The Alabama Cooperative Extension System documents ten insect pests across its vegetable garden material, but only half of them have any business on a pepper plant. The full roster the service tracks reads: aphids, corn earworm (tomato fruitworm), cowpea curculio, imported cabbageworm, leaffooted bug, Mexican bean beetle, spider mites, spotted cucumber beetle, squash vine borer, and stink bugs.
Cowpea curculio is a cowpea and southern pea specialist, so scarred or shot-holed pods on a nearby bean row don’t mean anything for the pepper bed beside it. Imported cabbageworm chews on cabbage-family leaves, cabbage, collards, broccoli, kale, and has no reason to touch pepper foliage. Mexican bean beetle stays on beans start to finish. Spotted cucumber beetle and squash vine borer both belong to the cucurbit world, cucumbers, squash, melons, and neither one feeds on or bores into a pepper stem. Naming any of those five on a pepper problem would be a misdiagnosis, not a documented risk.
That leaves aphids, corn earworm (tomato fruitworm), leaffooted bug, spider mites, and stink bugs as the pests the extension service documents that actually feed on pepper in this territory, whether the planting is a raised bed or a row in a larger garden.
Alabama averages 58.5 days a year at or above 90°F, per NOAA NCEI Climate Normals for the 1991-2020 period at the reference station. That heat load matters here because it’s the exact condition that pushes aphid and spider mite reproduction into overdrive, and it’s also one half of the temperature window pepper plants need for fruit to set at all. Corn earworm, leaffooted bug, and stink bug care less about heat and more about what stage the plant is in, flowering or fruiting, when their adults show up looking for a place to lay eggs or a fruit to pierce.
Aphids and spider mites are the two to watch from the moment a Transplant goes in the ground, because both can establish on young foliage long before a single pepper sets. The other three wait for the plant to give them something worth targeting.
When each one shows up, and what it does first
Timing in this territory runs off the frost-free window, not a fixed month. Transplants go in only after the last spring frost and once soil has reached 60°F, and at the reference station that last frost falls between March 19 and April 3. Suburban and rural gardens away from that airport station commonly see their last frost land later, sometimes by one to two weeks, so a gardener working from a nearby town rather than the reference city should push the calendar back rather than forward.
Aphids are usually the first sign of trouble a gardener notices after transplant. They cluster on the undersides of young leaves and along new growth, and the first visible clue is often not the insect itself but the curling or slightly puckered look of a leaf that’s been fed on for a week or two. Spider mites follow a similar early timeline. They favor hot, dry stretches, which lines up with those 58.5 days a year the state spends at 90°F or hotter, and the first sign is a fine stippling or bronzing on leaves rather than any visible bug, since mites are small enough that a hand lens is often needed to confirm them.
Leaffooted bugs and stink bugs don’t bother with a pepper plant until it has something to pierce. Both wait for fruit to set, which itself depends on temperatures staying inside a workable range, since pepper fruit set fails at both ends, on nights below 55°F and on days above 90°F. Once fruit is present, the first sign of either bug is usually a small dimple or corky spot on the fruit surface where a piercing mouthpart went in, well before the insect is spotted on the plant.
Corn earworm, also known as tomato fruitworm, tracks the plant’s flowering rather than its fruiting. Moths are drawn to open blossoms and lay eggs nearby, and the first visible sign on pepper is usually a small entry hole near the stem end of a young fruit, sometimes with a bit of frass just outside it. Because this insect follows flowering rather than a set date, it can show up anywhere in the stretch from first bloom through the rest of fruit production.
Telling the damage apart from everything else
Not everything that looks like insect damage on a pepper plant is insect damage, and treating a heat or water problem as a bug problem wastes time without fixing anything. The clearest decision rule here is temperature: nights below 55°F or days above 90°F will cause blossoms or small fruit to drop on their own, with no insect involved at all. That single fact rules out a pest before a gardener even goes looking for one, on any stretch where the thermometer says the plant was simply outside its working range.
| Symptom | Possible causes | What tells them apart |
|---|---|---|
| Curling, yellowing or stippled leaves | Aphids or spider mites; or a nutrient shortfall | Insects or fine webbing are visible with a hand lens under the leaf; a nutrient issue is usually uniform across the plant with nothing visible feeding |
| Blossoms or small fruit dropping | Stink bug or leaffooted bug feeding; or temperatures outside the 55°F to 90°F fruit-set window | Check recent nights and days against that window first; insect feeding leaves pinprick marks on flowers or young fruit that temperature stress does not |
| Corky or sunken spots on fruit | Stink bug or leaffooted bug feeding; or sunscald; or blossom end rot | Insect damage shows discrete puncture dimples; sunscald is a bleached patch on the sun-facing side; blossom end rot is a dark, leathery spot at the blossom end |
| Small hole near the stem end with debris | Corn earworm; or mechanical damage from handling or hail | Corn earworm damage includes frass just outside the hole; mechanical cracks and bruises do not |
A gardener who sees one of these symptoms is looking at a short list of possibilities, not a diagnosis. The safest next move is a call or a photo sent to the county extension office rather than a guess made from a search result, since the same symptom can point in more than one direction depending on what’s happened to that plant in the prior week.
What actually works here, and what is a waste of time
The single biggest lever on a short growing season is timing, not treatment: transplanting only after soil hits 60°F and frost has passed keeps young plants off to a strong start before aphids and spider mites have a stressed, slow-growing plant to exploit. A transplant set out too early, into cold soil, grows slowly enough that even a light aphid load can set it back for weeks.
A physical barrier, floating row cover laid over the bed before flowering, keeps corn earworm moths and the piercing bugs off young plants during the weeks they’d otherwise be laying eggs or hunting for fruit to feed on. That cover has to come off once flowers open, though, or pollination stops along with the pests. Hand-picking works reasonably well against stink bugs and leaffooted bugs specifically because both are large, slow-moving insects, easiest to catch in the cooler part of the morning when they’re sluggish.
What wastes effort is spraying anything on a schedule that ignores what’s actually happening to the plant. A pepper plant already stressed by one of those 58.5 days a year above 90°F doesn’t need an added chemical load on top of heat stress, and treating blossom drop caused by temperature as though it were an insect problem does nothing but waste a trip to the garden. This site doesn’t name products, rates, or active ingredients, because what’s labeled and legal to use changes and only the county extension office has the current answer for a given situation.
Where to check this for your own county
Everything above comes from the Alabama Cooperative Extension System, and it describes what’s documented at the state level, not what’s necessarily in any one backyard. A pest common in one county can be a non-issue two counties over, depending on soil, surrounding crops, and local weather in a given season.
Because the reference frost dates come from a single airport station, suburban and rural gardens elsewhere in the state often see their last spring frost land one to two weeks later than March 19 to April 3, which shifts every timing decision that follows it, transplant date, row cover removal, first expected fruit set. That gap is exactly the kind of detail a county office can confirm for a specific address in a way a statewide average cannot.
The most useful next step for anyone trying to identify a pest on their own plants is a call, email, or in-person visit to their county extension office, ideally with a photo or a sample in hand. That’s the office equipped to say what’s actually active in that county this season, not just what the state as a whole has documented.
Common questions
Do all five documented pests attack pepper at the same time?
No. Aphids and spider mites tend to show up early, soon after transplant, while leaffooted bugs, stink bugs, and corn earworm generally wait until the plant is flowering or fruiting.
Can cold nights alone cause fruit drop without any insect involved?
Yes. Pepper fruit set fails on nights below 55°F just as it fails on days above 90°F, and either condition can cause blossoms or small fruit to drop with no pest present at all.
Is spider mite damage the same as a nutrient deficiency?
No, but they can look similar from a distance. Spider mite damage shows fine stippling and sometimes webbing under the leaf, visible with a hand lens, while a nutrient shortfall is usually spread evenly across the plant with nothing feeding on it.
Why doesn’t this article mention squash vine borer or Mexican bean beetle on pepper?
Because neither one feeds on pepper. Squash vine borer targets cucurbits like squash and cucumbers, and Mexican bean beetle stays on beans, so both are outside the scope of a pepper-specific pest list even though the Alabama Cooperative Extension System documents them for other crops.