Pawpaw pests and problems
Here is the good news up front: the pawpaw is one of the least troublesome fruit trees you can grow. It has almost no serious insect pests, its diseases are mostly cosmetic, and it bounces back from damage that would set most fruit trees back a year. The one real adversary is the deer.
Deer: the real threat
If a young pawpaw fails, a deer is the usual reason. Deer will browse the leaves of a small tree, and in autumn bucks rub their antlers on slender trunks, which can girdle or snap a sapling, or take out a fresh graft, in a single night. Mature trees are largely left alone, so the job is getting young trees through their first few years.
The proven defenses are physical. A five-foot fence keeps deer off entirely, since they tend to walk around a barrier rather than jump into a tight space. A tree tube or a sturdy wire cage protects the trunk from rubbing and the leaves from browsing; tubes also speed early height growth, though they should be watched so the tree does not grow spindly or get girdled. Even a broken graft often survives if the scion is not completely severed, so a cage around the union is cheap insurance.
The few insect pests
Pawpaw foliage and bark contain natural compounds that most chewing insects avoid, which is why the tree is so clean. The insects you may notice rarely matter:
- Pawpaw peduncle (flower-stalk) borer. A tiny larva that feeds inside flower stalks and makes some blooms wither. Because a pawpaw carries far more flowers than it needs, it almost never dents the crop.
- Japanese beetles. May skeletonize a few leaves in early summer. Traps placed well away from the trees, or simply ignoring light feeding, is usually enough.
- Raccoons and opossums. The real competition for ripe fruit. In a bad year an electric wire or picking slightly early solves it.
Leaf and fruit spots
Two cosmetic diseases show up on pawpaw, especially in wet seasons. Phyllosticta leaf spot speckles leaves and fruit skin with small dark marks; raking up fallen leaves and fruit through the season reduces the spores that carry it over. Pseudomonas bacterial spot makes darker spots ringed with a pale halo and is worse where air is still and humid. Neither spoils the flesh inside the fruit; spacing trees for airflow and cleaning up debris keeps both to a nuisance.
The zebra swallowtail: a reason not to spray
The pawpaw is the sole host plant of the zebra swallowtail butterfly. Its caterpillars eat only pawpaw leaves, taking up the tree’s natural compounds as a defense of their own, and a healthy tree easily carries that light feeding. It is a feature, not a problem: plant pawpaws and you tend to get the butterflies. It is also the best argument against reaching for a broad-spectrum insecticide, which would kill them and the flies and beetles that pollinate your crop for almost no benefit.
A remarkably tough tree
Whatever gets thrown at it, a pawpaw is hard to kill. Trees stripped bare by deer, hail, or caterpillars routinely leaf out again from dormant buds along the stems and carry on. A sudden flush of root suckers can signal a stressed tree worth investigating, but the plant itself is among the most forgiving fruit trees in a home orchard.
Common questions
What are the main pests of pawpaw trees?
Surprisingly few. The pawpaw’s biggest threat is deer, which browse and rub young trees. Insects rarely do real harm: a small flower-stalk borer and the odd Japanese beetle turn up but seldom cut the crop, and raccoons or opossums may take ripe fruit. Pawpaw is one of the most pest-free fruit trees you can grow, largely because its leaves and bark carry natural compounds most insects avoid.
Do deer eat pawpaw trees?
Deer generally leave mature pawpaw foliage alone, but they will browse young trees and, worse, rub their antlers on the trunks in fall, which can snap a sapling or a graft. Protect young trees with a tall fence, a tree tube, or a wire cage until the trunk is sturdy and above browse height.
What are the black or brown spots on my pawpaw leaves and fruit?
Usually one of two cosmetic diseases. Phyllosticta leaf spot makes small dark flecks on leaves and fruit skin and is worst in wet years; raking up fallen leaves and fruit reduces it. Pseudomonas bacterial spot causes dark spots with a pale halo. Both are mostly surface blemishes that do not ruin the fruit inside, and good air flow and sanitation keep them in check.
Should I spray my pawpaw for pests?
Rarely, and think twice before you do. Pawpaw is the only host plant of the zebra swallowtail butterfly, whose caterpillars feed on the leaves, and a healthy tree shrugs off that light feeding. Broad-spectrum insecticides kill those butterflies and other beneficial insects for little gain. Most growers rely on physical barriers against deer and simply tolerate the minor insect activity.
Will my pawpaw recover if something eats all its leaves?
Very likely. Pawpaws are remarkably tough and routinely regrow after being completely defoliated by deer, weather, or caterpillars, pushing fresh growth from buds along the stems. Sudden root suckering can be a sign a tree is stressed, so check for an underlying cause, but the tree itself is hard to kill outright.
Protection that actually helps
Most pawpaw "pests" are deer and squirrels, not insects. A vented tree tube protects a young tree, repellent covers the gap while trees are small, and bagging individual fruit beats netting a whole tree. (Zebra swallowtail caterpillars eat some leaves; leave them be, they are the pawpaw butterfly.)
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Keep going
- The pawpaw tree: how big, how fast, how to grow one
- Pawpaw pollination: why a healthy tree still may not fruit
- Harvesting pawpaws and can I grow one where I live?
Sources
Grounded in university extension and grower guidance:
- University of Florida IFAS, Zebra Swallowtail (its pawpaw host relationship).
- University of Missouri IPM, "Pawpaws: A Taste of the Tropics".
- Kentucky State University Pawpaw Program, and Blake Cothron, Pawpaws: The Complete Growing and Marketing Guide.
Pest and disease pressure varies by region and season; treat this as general guidance.
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