Pest and Disease Index

Last revised by localroot - 7 Jun 2026, 19:50

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Pest and Disease Index

Use this index to connect symptoms with likely causes, better photos, and reputable references. It is not a substitute for a diagnostic lab, especially when a plant may need removal or pesticide treatment.

Fast triage

Whole-plant wilting can indicate water stress, root damage, crown issues, heat, herbicide injury, or severe disease.
Dark leaf spots with yellowing and leaf drop often suggest Black Spot, but downy mildew, anthracnose, spray injury, and nutrient stress can confuse the picture.
White powder on leaves, buds, or stems points toward Powdery Mildew.
Orange or dark pustules on leaf undersides and stems suggest Rust.
Distorted new growth can come from Rose Rosette Disease, RRD Look-Alikes, herbicide injury, aphids, thrips, mites, or environmental stress.
Skeletonised or windowpane leaf damage often points to Sawfly Larvae.

Treatment standard

Start with cultural controls: resistant cultivars, spacing, pruning for air, watering method, sanitation, and plant stress reduction.
Treat only the likely problem. Broad spraying can kill beneficial insects and make mite or aphid problems worse.
Use the current local label, HSE/UK product authorisation, EU/member-state rules, and local extension guidance before any pesticide use.
For serious or unclear cases, ask a diagnostic lab or plant health authority rather than guessing from one photo.

Good diagnosis photos

Whole plant in daylight.
Close symptom photos plus leaf undersides, buds, canes, crown, soil or pot.
Nearby roses and the affected cane over time for possible RRD.
Watering, recent sprays, fertiliser, weather, region, zone, and cultivar if known.

Key pages

Use controls lawfully: Current local product label/register wins for any pesticide, fertiliser, or soil amendment use.

Sources

Discussion log

Use comments for sourcing notes, corrections, and disputed details.

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