What diseases affect snapdragon?

Downy Mildew, Grey mould, White mould (Sclerotinia), Rust, Verticillium wilt

Snapdragon pests and diseases: how to recognise them

Q: Which snapdragon problems need quick action?

Downy Mildew: Badly affected leaves shrivel and turn brown or yellow and fall early; plants become stunted and some may die. Grey mould: Fuzzy grey-brown mould on decaying buds, flowers, leaves, stems or fruit in humid weather. White mould (Sclerotinia): A soft, wet rot on stems, often near soil level; plants suddenly turn yellow, wilt and collapse.

Antirrhinum majus

The pests, diseases and disorders recorded for snapdragon in our library, each with a photo and its first symptom. Every page has the full list of symptoms, organic and chemical treatment and prevention.

At a glance

Problems in total	6
Pests	1
Diseases	5
Need quick action	3

How to grow snapdragon · All pests and diseases

Pests

Broad miteNew leaves are twisted, hardened and distorted, with bronzed undersides; the mites are too small to see without magnification.Photo: David Riley, University of Georgia, Bugwood.org, CC BY 3.0, Wikimedia Commons

Diseases

Which snapdragon problems need quick action?

These spread or do lasting harm fast; check the plants and start treatment the day you see them.

Downy Mildew: Pale green, yellow, purple or brown blotches on the upper side of leaves, often angular where they are bordered by the veins.
Grey mould: Small, almost translucent spots that turn brown and water-soaked; affected tissue goes soft, dark and dies, and buds and flowers shrivel.
White mould (Sclerotinia): Masses of fluffy white, cotton-like mould on the affected parts, especially in cool, damp weather.

Plants with many of the same problems

Which plants each problem affects: sources

The links between these problems and the plant were checked against these pages.