Pest Management Tips

Identify before you act. Many insects that look alarming are actually beneficial — ladybug larvae look like tiny alligators but eat hundreds of aphids. Take a photo and identify the pest before reaching for any treatment. If it is a genuine pest, check the damage level — a few holes in leaves are cosmetic, not life-threatening. Intervene only when damage threatens plant health.

Plant a variety of small-flowered plants that provide nectar and pollen for adult beneficial insects. Yarrow, dill, fennel, alyssum, and marigolds attract ladybugs, lacewings, hoverflies, and parasitic wasps — all of which prey on common garden pests. Leave some areas slightly wild with ground cover and leaf litter where predatory beetles and spiders shelter.

Some companion planting combinations have genuine scientific support. Marigolds release compounds that repel certain nematodes. Basil near tomatoes may reduce whitefly. Alliums (garlic, chives) deter some aphids. However, many companion planting claims are exaggerated. The most reliable approach is diverse planting — mixing many species confuses pests and supports a balanced ecosystem where predators keep pest populations in check.

A strong jet of water knocks aphids off plants and most never find their way back. For persistent infestations, insecticidal soap (not dish soap) sprayed directly on aphids dehydrates them on contact. Neem oil prevents aphids from reproducing. Long-term, attract ladybugs and lacewings — a single ladybug eats 50 aphids per day. Avoid broad-spectrum insecticides that kill predators along with pests.

Copper tape around raised beds and pots creates a barrier slugs will not cross. Beer traps (shallow containers of beer sunk into the ground) attract and drown slugs. Water in the morning rather than evening — slugs are active at night and dry soil discourages them. Encourage frogs, hedgehogs, and ground beetles as natural predators. Iron phosphate-based slug pellets are organic-approved and less harmful to wildlife than metaldehyde.

Never. A healthy garden teems with insects — the vast majority are beneficial or neutral. Only about 3% of insect species are garden pests. Attempting to eliminate all insects destroys the predator-prey balance and actually makes pest problems worse. Tolerate cosmetic leaf damage, encourage diversity, and intervene surgically only when a specific pest threatens a specific plant.