What pests attack grape?

Broad mite, Scale insects, Two-spotted spider mite, Vine weevil

What diseases affect grape?

Downy Mildew, Grey mould, Honey fungus, White mould (Sclerotinia)

Grape pests and diseases: how to recognise them

Q: Which grape problems need quick action?

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: Fuzzy grey-brown mould on decaying buds, flowers, leaves, stems or fruit in humid weather. Honey fungus: Branches die back over several years, or the whole plant dies suddenly in hot dry weather; leaves are smaller and paler, autumn colour comes early, and a last unusually heavy flowering or crop may come just before death. White mould (Sclerotinia): A soft, wet rot on stems, often near soil level; plants suddenly turn yellow, wilt and collapse.

Vitis vinifera

The pests, diseases and disorders recorded for grape 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	8
Pests	4
Diseases	4
Need quick action	4

How to grow grape · 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
Scale insectsSmall round or oval bumps on stems and along leaf veins, mostly underneath, that do not move and look like shells or scabs.Photo: BARAKAT2011, CC BY-SA 3.0, Wikimedia Commons
Two-spotted spider miteFine pale stippling or mottling on the upper leaf surface; leaves may turn bronze.Also called: red spider mitePhoto: Gilles San Martin from Namur, Belgium, CC BY-SA 2.0, Wikimedia Commons
Vine weevilDull black, pear-shaped weevils about 9 mm long with dirty-yellow flecks, feeding at night; they cannot fly.Also called: black vine weevilPhoto: Opuntia, CC BY-SA 3.0, Wikimedia Commons

Diseases

Which grape problems need quick action?

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

Downy Mildew: A white, grey or purple mould on the underside of the leaf, directly below each blotch, in damp weather.
Grey mould: Small, almost translucent spots that turn brown and water-soaked; affected tissue goes soft, dark and dies, and buds and flowers shrivel.
Honey fungus: Peel back the bark at the base — a creamy-white, paper-thin sheet of fungus between bark and wood that smells strongly of mushrooms confirms it; the bark at the base may crack and bleed.
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.