I have aphids on multiple plants — do I need to spray everything?
Aphids tend to colonize plants under stress and naturally crash when beneficial insects find them — water sprays and patience are often more effective than pesticides.
Aphids are soft-bodied insects that feed by piercing plant tissue and extracting sap. They reproduce rapidly — a single female can produce 80 or more offspring per week without mating — so a small population can become a large one quickly, especially in warm weather. They tend to cluster on new growth, stem tips, and leaf undersides. Signs include sticky residue (honeydew) on leaves and surfaces below affected plants, and an associated sooty mold that grows on the honeydew.
Natural enemies arrive when populations reach a certain density. Lady beetles (ladybugs), lacewings, parasitic wasps, and predatory midges all feed heavily on aphids. In many gardens, an aphid outbreak that starts in mid-spring will crash on its own within 2–3 weeks as predator populations build. Spraying insecticide at the first sign of aphids kills both the aphids and the predators, which can lead to a rebound infestation worse than the original.
A strong stream of water directed at infested stems and leaf undersides on 3 consecutive days knocks a substantial proportion off the plant; aphids that fall rarely return to the same plant. This is often sufficient control for moderate infestations. Insecticidal soap (diluted per label to 2%) applied directly to aphid clusters kills on contact and breaks down quickly without systemic effects. Apply in the evening to reduce risk to beneficial insects and to slow drying.
Plants under stress — drought, poor nutrition, overcrowding — are more susceptible to heavy aphid pressure. Addressing underlying plant health (consistent watering, adequate spacing) tends to reduce recurring aphid problems over time. Avoid high-nitrogen fertilization during aphid season — the resulting flush of soft new growth is exactly what aphids prefer.
- TomatoThe warm-season anchor of the summer garden.
- PepperA tropical perennial grown as an annual — patient, slow, and particular about warmth.
- KaleThe cold-weather workhorse that improves when everything else quits.
- LettuceA cool-season leaf crop that thrives in spring and fall, sulks in summer heat.
- PeaA cool-season crop that rewards early sowing and quits when summer arrives.
- AphidSoft, clustered insects on new growth causing curled leaves and sticky honeydew.
- Blossom DropFlowers fall before setting fruit, often during temperature extremes or after weather stress.
- ClubrootBrassica plants wilt and yellow despite watering; roots show club-shaped swellings when dug.
- Corn Earworm / Tomato FruitwormCaterpillars eating corn kernels from the tip; same species bores into tomato and pepper fruit. Often called 'tomato fruitworm' when found on tomato.
- White-tailed DeerRagged, torn foliage and missing plants from the top down — hoof prints nearby confirm the cause.
- Something is stripping my tomato plants bare overnight — what is it?Tomato hornworms are the likely culprit — 3–4 inch green caterpillars that are nearly invisible against tomato foliage and can defoliate a plant in two or three nights.
- How do I deal with cabbage worms on my kale and other brassicas?Bt (Bacillus thuringiensis) spray applied to the leaf undersides is the most targeted control for cabbage worms — hand-picking and row cover are also effective without any spray at all.
- Why are my cucumber leaves puckered, crinkled, or distorted?Puckered or crinkled cucumber leaves usually mean a mosaic virus (spread by aphids) or severe aphid feeding itself — check the undersides of leaves for aphid colonies before concluding it's a virus.