Common Strawberries pests

Spotted wing drosophila is a small vinegar fly whose females cut into ripening fruit to lay eggs, leaving soft, collapsing berries with tiny white maggots inside. Tarnished plant bug (Lygus) adults and nymphs feed on flowers and developing fruit, causing catfacing and hard, seedy, misshapen tips. The strawberry bud weevil, or clipper, is a small snouted beetle that punctures and clips flower buds so they dangle and dry up. Twospotted spider mites stipple and bronze the undersides of leaves in hot dry spells, aphids curl new growth and can spread viruses, and slugs, sap beetles, and birds chew ragged holes or hollows in ripe berries.

Common diseases

Gray mold (Botrytis) is the most common fruit disease, coating berries in fuzzy gray spores especially in wet weather and on fruit touching the soil. Powdery mildew shows as white patches and upward-curling leaf edges with purple blotches, while common leaf spot and leaf scorch produce purple-bordered spots that dry to tan or reddish blotches. Anthracnose causes sunken dark lesions on fruit, stems, and runners, and soilborne root diseases like red stele (a Phytophthora) and Verticillium wilt cause stunting, wilting, and collapse. Angular leaf spot is a bacterial disease seen as water-soaked, angular translucent spots between leaf veins, and aphid-spread viruses can cause mottling, yellowing, and declining vigor over several seasons.

Prevention

Start with certified disease-free, virus-indexed plants and choose resistant varieties, including red stele and Verticillium-resistant types where those diseases are a problem. Space plants for good airflow, keep matted rows narrow, and renovate June-bearing beds after harvest by mowing old foliage and thinning crowns. Mulch with clean straw to keep fruit off the soil, water at the base with drip or a soaker hose in the morning rather than overhead, and pick fruit promptly, removing rotten or overripe berries. Rotate to a fresh bed every three to four years, and avoid planting where tomatoes, potatoes, peppers, or eggplant recently grew, since they share Verticillium.

Organic control

Hand-pick slugs in the evening and use iron phosphate slug bait, and cover birds and early-season pests with floating row covers, removing them during bloom so pollinators can reach the flowers. For spotted wing drosophila, hang apple cider vinegar traps to track and reduce adults, harvest frequently, and chill or promptly remove culls. Encourage and release beneficials such as predatory mites for spider mites and lady beetles and lacewings for aphids, and treat soft-bodied pests with insecticidal soap or neem when populations build. Sulfur helps against powdery mildew and copper can suppress bacterial angular leaf spot, and spinosad is an option for fruit flies. Always read and follow the product label for timing, spray intervals, and pre-harvest limits.

Scouting & monitoring

Begin scouting at first bloom, tapping flower clusters over a white surface to catch tarnished plant bugs and watching for clipped, dangling buds from the bud weevil. As fruit colors up, check undersides of leaves weekly for spider mite stippling and aphid colonies, and inspect ripening and overripe berries for the soft spots and maggots of spotted wing drosophila. During warm, wet, or humid stretches, watch closely for gray mold and leaf spots, and note any wilting or stunted plants that could signal soilborne root disease. Keep a few vinegar traps out from the time the earliest berries begin to ripen through the end of harvest.

Tips

Straw mulch plus base watering is the single most effective step, keeping fruit clean and dry and cutting gray mold dramatically. Harvest often, every day or two in peak season, and remove every rotten or overripe berry, since clean, timely picking is your best defense against both fruit rots and spotted wing drosophila.

General home-garden IPM guidance, focused on prevention and least-toxic control. Always read and follow the product label for any pesticide, including organic products. Page updated Aug 4, 2026.