The Sri Lanka weevil (Myllocerus undecimpustulatus undatus) is a small invasive beetle native to Sri Lanka and southern India that has become a widespread plant pest in the southeastern United States, particularly Florida. It’s a broad-snouted weevil roughly 6 to 8 millimeters long, pale gray to whitish in color with faint spots on its wing covers, and it feeds on an unusually wide range of ornamental and agricultural plants. If you’ve noticed irregular notching along the edges of leaves in your yard or citrus grove, this weevil is a likely culprit.
How to Identify the Sri Lanka Weevil
Adults are small, oval-shaped beetles covered in tiny pale scales that give them a grayish-white or light greenish appearance. They have the characteristic elongated snout shared by all weevils, though theirs is relatively short and broad compared to many relatives. Their wing covers often show faint darker spots arranged in rows, which can fade or become less visible as the scales wear off over time.
One distinctive behavior makes them tricky to spot: when disturbed, Sri Lanka weevils will feign death and drop to the ground, where their pale coloring blends into soil and mulch. They can also fly, which is unusual among weevils and helps explain how they spread so quickly once established in an area. You’re most likely to find them on the undersides of leaves or along new growth, especially during warmer months.
Leaf Damage From Adult Feeding
The most visible sign of a Sri Lanka weevil problem is the feeding damage adults leave on foliage. They chew along leaf margins, creating irregular scalloped or notched edges. This pattern is sometimes called “marginal leaf notching” and looks similar to damage from other weevil species. On citrus trees, the notching tends to appear on new flush growth first, since the adults prefer tender young leaves.
The host range is remarkably broad. Sri Lanka weevils feed on citrus, hibiscus, mango, cocoplum, live oak, Christmas palm, and dozens of other ornamental and tropical plants. In Florida landscapes, they’re commonly found on hedges and foundation plantings. While leaf damage from adults is mostly cosmetic on established plants, heavy infestations can slow growth and reduce the vigor of young or stressed plants.
Root Damage From Larvae
The less visible but more serious threat comes from the larval stage. Female weevils lay eggs on or near the soil surface at the base of host plants. After hatching, the small, white, legless grubs burrow into the soil and begin feeding on plant roots. Because this damage happens underground, you won’t see it directly.
Larval root feeding can cause canopy decline, where the foliage gradually thins, yellows, or wilts even though the leaves themselves aren’t being chewed. In severe cases, sustained root damage can kill plants outright. This underground feeding is most intense in late spring and early summer, just before larvae pupate and transform into adults. The majority of the weevil population overwinters as larvae in the soil, resuming feeding when soil temperatures warm in spring. This makes the root damage cumulative over time, particularly on smaller ornamental plants or young trees that have limited root systems to spare.
Where It’s Found
The Sri Lanka weevil was first detected in Florida in 2000 and spread rapidly throughout the state. It’s now established across much of peninsular Florida and has been reported in other parts of the southeastern U.S. Its ability to fly, its extremely broad host range, and the difficulty of detecting soil-dwelling larvae all contributed to its quick establishment. It likely arrived in the U.S. through imported plant material.
In its native range across Sri Lanka and India, natural predators and parasites help keep populations in check. In Florida and neighboring states, those biological controls are largely absent, which allows populations to build unchecked on landscape plants and in citrus groves.
Why This Weevil Is Hard to Control
Sri Lanka weevils present a frustrating control challenge at every life stage. Adults are difficult to target with pesticides because they fly, hide in dense foliage, and drop to the ground when disturbed. Eggs, larvae, and pupae are equally hard to reach because they’re located on or beneath the soil surface, where sprays don’t penetrate effectively. Traditional chemical control provides only limited results for these reasons.
Research on citrus has explored directing treatments at both the foliage and the ground simultaneously to target adults and soil-dwelling stages at the same time, with some success. But the practical reality for most homeowners and growers is that no single treatment eliminates the problem.
Managing Sri Lanka Weevils at Home
For small infestations on landscape plants, physical removal is a surprisingly effective first step. Shake infested branches vigorously over an open, upside-down umbrella or a light-colored sheet. The weevils will play dead and drop right off. Dump them into a container of soapy water to kill them. This won’t eliminate larvae already in the soil, but it reduces the number of adults laying eggs and limits further leaf damage.
Keeping plants healthy and well-watered helps them tolerate both leaf and root feeding. Vigorous plants can outgrow moderate weevil damage, while stressed plants are more vulnerable to decline from larval root feeding. Monitoring new growth for the telltale marginal notching lets you catch infestations early before populations build. Since larvae do their worst damage in late spring, checking plants for signs of canopy thinning or unexplained decline during that period can help you identify root-level problems before they become severe.
For persistent or heavy infestations, especially on high-value plants or citrus trees, targeted soil-applied treatments can help suppress larval populations. Product recommendations change frequently, so checking with your local agricultural extension office for current options is the most reliable approach.