Maltese gardens run warm nearly all year, which suits plants — and everything that eats them. Most island pest problems come from a short list of offenders, and most of the damage happens between "something looks off" and "we should do something", a gap that regularly spans months. Here is the identification parade, and what works.
The usual suspects
Scale insects and mealybugs
The island's most persistent duo. Scale looks like small brown or white bumps glued to stems and leaf undersides; mealybugs like tufts of white cotton in leaf joints. Both tap sap and excrete honeydew — so the tell-tale is often sooty mould (black film on leaves) or a motorway of ants, who farm them for the sugar. Treatment: horticultural oil sprays, repeated to catch hatchings, plus controlling the ants; heavy infestations on woody plants sometimes justify systemic treatments a professional can apply appropriately.
Red palm weevil
The killer. This beetle's larvae hollow out palms from the crown, and by the time fronds collapse, the palm is usually finished. Canary palms are the favourite victim — Malta has lost thousands. Watch for tunnelling damage at the crown, drooping newest fronds, or a fermented smell. Suspicion equals action: report and get professional assessment immediately; preventive treatments exist for palms in known-pressure areas.
Citrus leafminer, aphids and whitefly
Leafminer draws silvery squiggles inside young citrus leaves — ugly, but mature trees shrug it off, as noted in our citrus care guide. Aphids cluster on soft new growth everywhere in spring; whitefly clouds rise from underleaves in warm months. Oils, soaps and encouraging predators handle most of it; the yellow sticky traps that catch whitefly also monitor what else is around.
Snails
Malta's rain-triggered plague. After the first autumn showers, snails emerge in biblical quantities and shred young plantings overnight. Barriers, evening collection raids, and — used carefully and pet-consciously — modern ferric phosphate baits keep beds survivable. Copper tape genuinely helps for pots on a balcony garden.
Processionary caterpillars
On pines, silky white nests in winter and the famous nose-to-tail caterpillar trains in late winter. Do not touch — their hairs are seriously irritant to people and dangerous to dogs. Nest removal on garden pines is professional work.
Spray last, look first
The professional habit worth copying: identify before treating, and treat the cause, not the symptom. Sooty mould washes off once the scale is dealt with; blasting everything with broad insecticide kills the predators doing half your pest control for free. A monthly walk-through with attention — leaf undersides, new growth, ant traffic — catches every pest on this list while it is still a small problem.
Getting help
For infestations past the DIY line — palm weevil always, mature-tree scale, recurring mystery decline — post close-up photos and the plant's story on Qabbad's gardener page. Gardeners covering your locality can identify from good photos surprisingly often, and a regular maintenance visit is, in practice, a pest-monitoring subscription.
Frequently asked questions
What is eating my plants overnight in Malta?
After rain, snails — check by torchlight and look for slime trails. In warm dry months, caterpillars and beetles are likelier; leaf damage patterns and droppings identify the culprit.
How do I know if my palm has red palm weevil?
Drooping or collapsed newest fronds, holes and chewed fibre at the crown, a fermented smell, or sudden asymmetry. It is urgent: assessment and treatment must happen before the crown fails, and neighbouring palms should be checked too.
What is the black film on my plant's leaves?
Sooty mould growing on honeydew from sap-suckers above — scale, mealybug, aphids or whitefly. Treat the insects; the mould then washes away with soapy water.