Common Lantana Pests and How to Control Them

Lantana has a reputation as a plant that pests leave alone, and its bitter, aromatic leaves do put off many leaf-eaters.1EDIS. Control of Lantana in Pastures But a handful of insects and mites specialize in it or tolerate it well, and in a warm summer they can strip its color or its flowers. The damage usually points to the culprit, and most problems can be fixed with gentle methods that keep the plant safe for the pollinators you planted it for.

How to Tell Which Pest Is Attacking Your Lantana

A quick check settles most cases. Turn leaves over, because lace bugs and whiteflies live on the undersides. Hold a sheet of white paper under a branch and tap it; mites show up as tiny moving specks. Caterpillars and beetles are easier to find in the morning, and a phone camera zoom or a hand lens makes the smallest pests visible.

Not every problem is a pest. Drought and heat also cause wilting and leaf drop, and some lantana naturally slows its flowering when it sets lots of berries. Find the pest itself before you treat, rather than going by the symptom alone.

Lantana Lace Bugs, the Most Damaging Sap-Sucker

Adult and young lace bugs feed on leaf undersides, piercing cells with needle-like mouthparts.9University of Georgia Extension. Lantana Lace Bug: Biology and Management The drained cells lose their green color and look bleached.10University of Georgia Extension. Lantana Lace Bug: Biology and Management Damaged leaves then wilt and die, starting at the tips.11University of Georgia Extension. Lantana Lace Bug: Biology and Management Lace bugs also feed on developing flower buds, and the buds turn brown, which can shut down blooming entirely.12University of Georgia Extension. Lantana Lace Bug: Biology and Management A heavy infestation can affect most leaves and eventually kill the whole plant.13University of Georgia Extension. Lantana Lace Bug: Biology and Management

Adults are tiny, with lacy, see-through wings held flat. Young ones are dark, spiny and wingless. Dark specks of droppings dot the leaf undersides.

Moderate outbreaks can be knocked back with a strong blast of water from the hose.14Plant Addicts. Lantana Pests Insecticidal soap sprayed until it runs off the leaves kills soft-bodied insects on contact.15Plant Addicts. Lantana Pests Aim either one at the leaf undersides, where lace bugs live.

If most leaves on a branch are bleached or brown, prune the branch off. Bag the clippings and remove them rather than leaving them under the plant. Lantana regrows fast in warm weather, but check the new growth weekly for returning bugs.

Lace bugs often come back after one treatment because their eggs are protected on or in the leaves, and a soap spray or water blast does not reliably remove them. Plan on repeating water or soap treatments at intervals over a few weeks, checking undersides between rounds.

Whiteflies, Mealybugs and Spider Mites

Lantana is one of the ornamentals where whitefly damage is most noticeable, alongside hibiscus and verbena.16Greenhouse Management. Controlling whiteflies Whiteflies can also carry plant viruses.17Agricultural Biology. Whiteflies Infected lantana in the field has been found carrying a whitefly-spread virus that also attacks squash and melons.18PubMed. Weed Hosts: Hidden Reservoirs for Whitefly-Transmitted Viruses Threatening Georgia Cucurbits

Adult whiteflies fly, so they can move from lantana to nearby vegetables on their own. Treating the lantana does not clean up whiteflies already on the vegetables, so check the undersides of squash and melon leaves too.

Yellow sticky cards near the plant trap adults and show how many there are. Spray soap on leaf undersides every few days for two weeks to catch the young as they hatch. Sticky honeydew and black sooty mold are signs that numbers are high.

The lantana mealybug can feed on a very wide range of plants growing near infested lantana.19Plant Protection Quarterly. Host range studies with the Lantana mealybug (Phenacoccus parvus Morrison) It moves slowly, though, so it tends to spread by contact rather than flying in.20Plant Protection Quarterly. Host range studies with the Lantana mealybug (Phenacoccus parvus Morrison) Dab small clusters with a cotton swab dipped in rubbing alcohol. Check new nursery plants before setting them near lantana, and discard a heavily infested container plant rather than risk its neighbors.

Spider mite numbers tend to peak in the hottest, driest stretch of the year, generally July to mid-September.21Texas A&M AgriLife Extension. Common Lantana Pests and How to Control Them Keeping plants watered and rinsing the foliage in that window helps prevent outbreaks. Plant oil sprays work on spider mites but are best kept as a last resort.22Plant Addicts. Lantana Pests

Leaf Miners and the Lantana Stick Caterpillar

Leafminer beetle larvae tunnel inside leaves and pupate there, while adults feed on the leaf surface.23Brisbane Insects. Lantana Leafminer Beetles Their numbers can reach damaging levels in midsummer and strip whole stands of leaves.24African Entomology. Past and present initiatives on the biological control of Lantana camara (Verbenaceae) in South Africa Lantana may recover rapidly after this leaf loss, though.25African Entomology. Past and present initiatives on the biological control of Lantana camara (Verbenaceae) in South Africa A beetle-hit plant usually needs pruning and water, not spraying.

Larvae leave brown, blotchy patches where they tunneled, while adults leave a skeletonized, scraped look on the surface. Once beetle numbers drop, new leaves usually come out from the stems, so patience is reasonable. Raking up and bagging fallen mined leaves removes larvae and pupae that would otherwise start the next round.

Sprays rarely help here. Larvae inside leaves are shielded from contact sprays, and soap and oil only reach the surface-feeding adults.

The lantana stick caterpillar is a serious, often undetected pest across the southern US.26Southwestern Entomologist. Resistance Among Lantana Cultivars to the Lantana Stick Caterpillar, Neogalea sunia (Lepidoptera: Noctuidae) It is often behind lantana losing its flowers in late summer and early autumn.27Southwestern Entomologist. Resistance Among Lantana Cultivars to the Lantana Stick Caterpillar, Neogalea sunia (Lepidoptera: Noctuidae) Some lantana varieties resist it better than others.28Southwestern Entomologist. Resistance Among Lantana Cultivars to the Lantana Stick Caterpillar, Neogalea sunia (Lepidoptera: Noctuidae)

It is hard to spot because it is brown-green and holds still, looking like a twig. Search flower heads and stems at dusk or with a flashlight. Hand-pick the caterpillars and drop them into soapy water. If you want a spray, a caterpillar-specific one based on Bt spares bees and adult butterflies.

Root Pests and Nematodes

Root-knot nematodes are microscopic soil worms that cause swollen knots on roots. They can cut a lantana’s total growth by about half.29PubMed. Additive interaction between a root-knot nematode Meloidogyne javanica and a root-feeding flea beetle Longitarsus bethae on their host Lantana camara Lantana was once thought to resist nematodes, but aggressive types have been found infecting it.30Physiological and Molecular Plant Pathology. Pathogenic interaction and molecular characterization of Meloidogyne enterolobii infecting Lantana camara: A new host association from India That means lantana can act as a reservoir that passes root-knot worms to nearby crops.

Above ground, damaged roots cannot take up water and nutrients well, so the leaves yellow, the plant stays small, and it wilts in heat even when the soil is moist. These symptoms resemble drought or poor soil, so the roots are the only reliable way to confirm the cause. The damage often appears in patches, with neighboring plants declining together as the worms build up in that soil.

To confirm, dig up a struggling plant and look for bead-like knots on the roots. No home spray cures them. Remove the plant and roots and bin them, then replant that spot with a different, less susceptible plant, or use fresh soil in containers. Clean your tools after handling infected soil.

A different, leaf-infecting nematode spreads between nursery lantana when canopies touch, infecting all touching plants within 11 weeks.31PubMed Central. Population Dynamics and Dispersal of Aphelenchoides fragariae in Nursery-grown Lantana Only 5 to 10% became infected when plants were spaced 30 cm (about a foot) apart.32PubMed Central. Population Dynamics and Dispersal of Aphelenchoides fragariae in Nursery-grown Lantana

Gentle Treatments That Work

Start with a hard spray of water. It physically knocks soft-bodied pests such as lace bugs, mites and whitefly nymphs off the plant, and many do not climb back. Do it in the morning so the leaves dry before night, which lowers the chance of leaf disease. Water also carries no risk of chemical leaf burn, so it is the sensible first step for a mild problem.

Next comes insecticidal soap, a mild soap spray that kills soft insects on contact.33Plant Addicts. Lantana Pests Horticultural oil smothers pests and kills adults on contact.34Plant Addicts. Lantana Pests Contact sprays only kill what they touch, so coverage until runoff matters.35Plant Addicts. Lantana Pests Spray in early morning or evening, when bees are less active and leaves won’t scorch.

Test any spray on a few leaves first and wait a day for signs of burning. Avoid spraying in temperatures above about 90°F. Sprays don’t kill eggs, so repeat every 5 to 7 days. Keep spray off open flowers, where pollinators feed.

Dish detergent can damage leaves; use a product labeled for plants. Keeping plants watered helps against mites, but overwatering invites root rot.

Why Systemic Insecticides Can Harm Bees on Lantana

A systemic insecticide is absorbed by the plant and moves into its tissues. When one common systemic, thiamethoxam, was poured into lantana soil, nectar levels exceeded doses that kill several bee species.36PubMed. Influence of pesticide application practices, pruning, and planting on contamination of nectar in container-grown lantana The same product sprayed on leaves did not reach measurable levels in nectar.37PubMed. Influence of pesticide application practices, pruning, and planting on contamination of nectar in container-grown lantana In another nursery flower, it reached pollen at doses lethal to bumble bees.38Horticulturae. Pesticide Contamination of Pollen in Container-Grown Blanket Flower

The soil route is the risky one because roots take up the chemical and send it through the whole plant, including the nectar and pollen of flowers that open weeks later. Lantana blooms nonstop through the season, so a plant treated at the roots offers contaminated nectar to bees and butterflies for a long time.

Check labels for neonicotinoids such as thiamethoxam or imidacloprid before buying lantana or treating it. Nursery plants may have been treated before sale, and treated container plants can carry residues into your garden. Ask the garden center whether plants were grown without neonicotinoids, and look for pollinator-friendly labels.

Preventing Pests From Coming Back

A healthy plant keeps its bitter leaf defenses strong. Full sun and good airflow help keep plants vigorous, and deep watering during summer heat keeps them from stressing. Some nematode pests survive winter in infected plants,39PubMed Central. Population Dynamics and Dispersal of Aphelenchoides fragariae in Nursery-grown Lantana so remove dead or diseased plant material in autumn.

Ladybugs, lacewings and predatory mites eat lace bugs, whiteflies and mites. Broad-spectrum sprays kill these helpers and can trigger mite outbreaks. Flowers nearby give predators food and shelter.

When choosing plants, ask locally for varieties less hit by stick caterpillar or lace bug. Some lantana is invasive in warm regions; sterile varieties produce few berries.

Will a Damaged Lantana Recover

Severe lace bug infestations can kill a plant outright.40University of Georgia Extension. Lantana Lace Bug: Biology and Management Beetle-stripped lantana often recovers.41African Entomology. Past and present initiatives on the biological control of Lantana camara (Verbenaceae) in South Africa To judge whether a plant is still alive, scratch a stem; green under the bark means it can regrow.

To nurse a plant back, cut it back to healthy wood. Water deeply but let the soil dry between waterings. Hold off on heavy fertilizer, which feeds sap-suckers with soft growth. New blooms usually follow within weeks in warm weather.

Replace the plant when the roots are knotted, since nematodes won’t go away. No green tissue after pruning means the plant is dead. If severe outbreaks keep returning, choose a more resistant variety next time.