Palm pest

Palmetto Weevil

KillerSeriousManageableMostly cosmetic

North America's largest weevil and the most lethal insect pest of palms in Florida. Its larvae bore into the crown and destroy the bud, and by the time the crown collapses the palm is already lost.

Crown collapseFrassFoul odor

Palms it affects: Cabbage palm (Sabal), Canary Island date palm, Bismarck palm, Latan palm, Saw palmetto, Royal palm, Coconut palm, Date palm, Washingtonia, Pritchardia, Florida thatch palm, Caryota

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A palmetto weevil larva in its tunnel inside a Bismarck palm. The larvae feed in the soft tissue around the bud.

Affects: Cabbage palm (Sabal), Canary Island date palm, Bismarck palm, Latan palm and more
When it shows: Adults fly year-round. The high-threat window runs roughly March through June or July.
What we do first: A crown check on every high-risk palm at each visit.

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What you see

Signs in the field

Wet, chewed fiber (frass) at the base of the crown and leaf stems, sometimes running down the trunk
A fermenting, rotting odor when the crown is disturbed
Entry holes about 0.3 to 0.5 inch (8 to 12 mm) near the crown, in leaf bases or in pruning wounds
A spear leaf that pulls free with little resistance
Fronds drooping and collapsing, ending in a toppled crown, the "popped neck"
Legless cream grubs with a dark brown head inside the crown tissue

Often confused with

Ganoderma butt rot Lethal bronzing Fusarium wilt on Canary Island date palm Silky cane weevilRed palm weevil (not established in Florida)

From the field · 1 of 7

Palmetto weevil damage at the base of a Bismarck canopy: ragged, chewed leaf bases and wet, broken-down fiber.

The detail

What else to know

Why it matters

The weevil goes after the bud, the palm's only growing point. Once larvae destroy it, the palm cannot be saved.

For the first few weeks there are no canopy symptoms. The palm looks normal from the ground. Crown collapse usually shows from a distance 8 to 12 weeks or more after the attack, and by then there is nothing to treat.

What draws it in

Stress. Adults are drawn to the scent of wounded and stressed palms. Transplant shock, over-pruning, lightning strikes, construction damage and poor nutrition all raise the risk.

Canary Island date, Bismarck and latan palms seem to attract weevils even when healthy. Adults are active year-round here. The high-threat window runs roughly March through June or July.

How it spreads

Adults fly. An infested palm left standing, or a fallen crown left on site, can finish raising a new generation that moves to the next palm. Egg to adult takes about 84 days. That is the window to remove an infested palm.

Severe damage is not always a dead bud

Heavy damage does not prove the bud is gone. We have seen a severely damaged palm recover after a bud drench because its bud was still alive. So we assess the bud before any palm is written off. No outcome can be promised.

What we do

How Ptolemy handles it

Field condition first, then the recommendation. Treatment, removal and diagnosis calls are made by an ISA Certified Arborist, and the serious ones are confirmed in a lab.

Written down before it is neededThis is covered by our palmetto weevil protocol.

Crown checks at every service visit on high-risk palms: transplanted in the last 6 months, pruned in the last 60 days, Canary Island date, Bismarck and latan palms, and palms near a lightning strike or construction.
No green-frond pruning, above all in flight season. Every pruning cut on a palm is a permanent wound.
A preventive soil drench plus a crown spray on high-risk, high-value palms, as a case-by-case call by our certified arborist. We treat targeted palms, not the whole property.
When the bud is destroyed, prompt removal: chipped on site or hauled at once, never stockpiled near other palms.
Any weevil larger or redder than expected is escalated. The arborist reports a suspected red palm weevil to the state (FDACS) and keeps a specimen.

Next step