Gardening in Grenada is generous: warm all year, plenty of rain for much of it, and soil that grows almost anything. The same conditions suit insects, fungi and animals, and every Grenadian gardener has a story about a hedge stripped overnight by bachac, mangoes stolen by monkeys or a hibiscus that went white and sticky. Pest pressure is constant, but most problems can be managed without spraying everything in sight.
This piece looks at the pests residents most commonly face in yards and kitchen gardens, how to recognise them, and the methods that work in practice. It also covers when a problem is serious enough to involve the Ministry of Agriculture, which has dealt with major pest outbreaks in Grenada before, most famously the pink hibiscus mealybug in the 1990s.
Bachac: the leaf-cutting ant
Bachac is the Caribbean name for leaf-cutting ants, large reddish-brown ants that cut neat pieces of leaf and carry them in long lines back to an underground nest. They do not eat the leaves; they use them to grow a fungus that feeds the colony. A single nest can contain huge numbers of ants and can strip a citrus tree, rose bush or row of vegetables in a single night. Damage often appears suddenly, with leaves cut into half-moons and the plant bare by morning.
The key to control is finding the nest, which may be some distance from the damaged plant. Bachac are most active at night, so follow the trail with a torch after dark to locate the entrance mounds, often marked by loose, bare soil. Baits sold for leaf-cutting ants at agricultural supply stores are carried into the nest, where they affect the fungus garden. Physical barriers, such as sticky bands or a collar around tree trunks, protect individual plants. Large established nests are hard to eliminate and may need repeated treatment over weeks; small new nests are much easier, so act early.
Pink hibiscus mealybug and other sap-suckers
Grenada holds a special place in the history of one Caribbean pest. The pink hibiscus mealybug was first recorded on the island in late 1994. It spread rapidly, attacking more than a hundred types of plant including hibiscus, soursop, sorrel, cocoa, citrus and forest trees, and Grenada declared an emergency. Chemical controls proved ineffective, and the solution came through biological control: tiny parasitic wasps and a predatory ladybird beetle were released to feed on the mealybugs. The pest spread to many other Caribbean islands, but biological control brought it down to manageable levels in most places.
Mealybugs still appear in gardens. Look for clusters of white, waxy, cotton-like insects on new shoots, under leaves and where leaves meet stems. Infested shoots become twisted and stunted. Small outbreaks can be wiped off with a cloth dipped in soapy water or rubbing alcohol, or pruned off and disposed of. Avoid broad-spectrum insecticides, which kill the natural enemies that keep mealybugs in check. Aphids, scale insects and whitefly cause similar damage and respond to the same gentle approach; ants that farm them for honeydew need to be controlled at the same time.
Animals in the garden
Mona monkeys. Grenada's mona monkeys were introduced from West Africa centuries ago and live mainly in the forests of the interior, including around Grand Etang. In areas close to the forest edge, they raid fruit trees, eating bananas, mangoes and other fruit, sometimes before it ripens. They are protected wildlife and an attraction for visitors, so solutions are about deterrence: harvesting fruit promptly, netting small trees, and not feeding them, which encourages them to return.
Rats. Rats eat fruit, coconuts and vegetables, and nest in piles of debris and dense growth. Keep the yard tidy, store animal feed and rubbish in closed containers, and pick up fallen fruit. Traps are effective; poisons put dogs, cats and wildlife at risk.
Mongoose. Introduced to the Caribbean to control rats, the mongoose has become a pest of poultry and eggs. Secure chicken coops at night with fine mesh and solid floors.
Birds. Birds peck ripening fruit such as papaya, mango and sapodilla. Picking fruit just before full ripeness and ripening it indoors avoids most losses.
Stray goats and cattle. In rural areas, loose livestock can eat a garden in minutes. A sound fence and a closed gate are the only reliable answer.
Snails, slugs and soil pests
Some of the most common garden damage comes from creatures that work at ground level, mostly at night and in the rainy season.
- Slugs and snails eat seedlings and tender leaves, leaving slime trails and ragged holes. Hand-pick them at night with a torch, use beer traps or a ring of crushed eggshell, and remove hiding places such as boards and dense leaf litter.
- Large invasive snails. Neighbouring St Vincent and the Grenadines declared the giant African snail a pest in 2023 and has been fighting an infestation since. If you see unusually large snails, longer than a few centimetres with a long conical shell, do not move them; report them to the Ministry of Agriculture.
- Cutworms chew through young plants at soil level. A collar of cardboard or a cut plastic bottle around each seedling protects it.
- Termites attack dead wood, roots and sometimes living trees. Keep wood mulch and firewood away from the house, and inspect fences and sheds regularly.
- Root-knot nematodes cause swollen, knotted roots and stunted vegetables. Rotating crops and adding plenty of organic matter to the soil helps.
A sensible approach to any pest
Integrated pest management sounds technical, but in a home garden it comes down to a few habits that reduce the need for chemicals.
- Inspect regularly. A quick walk round the garden every few days, looking under leaves and at new growth, catches problems while they are small.
- Identify the pest correctly before acting. Many insects in the garden are harmless or beneficial, including ladybirds, lacewings, spiders and lizards.
- Start with physical methods: hand-picking, washing off with water, pruning infested parts and using barriers.
- Encourage natural enemies by avoiding broad-spectrum sprays and leaving some flowering plants that attract beneficial insects.
- If a pesticide is needed, choose the most targeted product, follow the label exactly, and keep children and pets away from treated areas.
- Keep the garden healthy. Well-fed, well-watered plants in suitable spots resist pests far better than stressed ones.
Mistakes and when to get help
Spraying everything. Strong insecticides used at the first sign of insects kill beneficial species and often make pest problems worse in the long run.
Moving plants without checking them. Many pests spread on cuttings and potted plants. Inspect gifts and purchases, and keep new plants apart for a week or two.
Ignoring unusual pests. New pests and diseases arrive through trade and travel. If you see something unfamiliar causing serious damage, contact the Ministry of Agriculture's extension officers in your parish. Early reports helped Grenada respond to past outbreaks.
Burning infested material carelessly. Burning garden waste is common, but it can spread fire and annoy neighbours, and it is restricted at times. Composting or bagging infested material is often a better option.
Leaving water standing. Old tyres, buckets, coconut shells and blocked gutters collect rainwater where mosquitoes breed. Aedes mosquitoes, which spread dengue, breed in surprisingly small amounts of water, so tipping out containers weekly is pest control for people as well as plants.
Killing lizards and toads. Geckos, anoles and toads eat large numbers of insects. They are allies in the garden and around the house, not pests.
Fungus and disease in the wet months
Not every damaged leaf is the work of an insect. In the rainy season, fungal problems multiply. Black sooty mould coats leaves of citrus, mango and ornamentals where aphids, scale or mealybugs have left sticky honeydew; it washes off once the insects are controlled. Anthracnose causes dark, sunken spots on mango and avocado fruit and black blotches on leaves and flowers, and is worst when flowering coincides with wet weather. Powdery mildew whitens the leaves of squash, cucumber and some ornamentals.
Most of these respond to better air movement and hygiene rather than sprays. Thin crowded plants, prune out diseased shoots, rake up and remove fallen infected leaves and fruit, and water at the base rather than over the leaves. Root rot, which shows as wilting even though the soil is wet, usually means poor drainage; raise beds or move pots. Copper-based fungicides are sold at agricultural supply shops for serious cases on fruit trees, but read the label carefully and ask an extension officer if unsure which product suits the problem.
Frequently asked questions
What is bachac in Grenada?
Bachac is the local name for leaf-cutting ants. They cut leaves and carry them to underground nests to grow fungus for food. They can strip trees and vegetable plants overnight, and control focuses on finding and treating the nest rather than spraying the plants.
Is the pink hibiscus mealybug still a problem?
It is still present but usually kept at low levels by natural enemies introduced during the biological control programme after the mid-1990s outbreak. Small infestations appear in gardens and can be handled by removing affected shoots and avoiding sprays that kill beneficial insects.
How can monkeys be kept away from fruit trees?
Harvest fruit promptly, net small trees where practical, keep the yard clear of fallen fruit and never feed the monkeys. Mona monkeys are protected wildlife, so the focus should be on making your yard less attractive rather than harming them.
Who can advise on a serious pest problem?
The Ministry of Agriculture has extension officers who advise farmers and gardeners on pests and diseases. They are the right people to contact about unusual pests, suspected invasive species or problems affecting several gardens in an area.
Are chemical pesticides safe to use around the home?
Some are, if used carefully and exactly as the label instructs, but many are toxic to pets, children, bees and fish. Try physical methods and targeted products first, store chemicals securely, and never decant them into drink bottles.
