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The Royal Horticultural Society

Mould, stickiness, rotting
or wilting

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Which part of the plant is affected?

Fruits, seeds

Fruits, seeds

General

Blossom end rot
Brown rot on fruits
Grey mould (Botrytis cinerea)

Specific plants

Apple scab
Grape shanking
Pear fruitlet gall midge
Pocket plum
Pyracantha scab
Raspberry beetle

Flower

Flowers

General

Blossom wilt
Grey mould (Botrytis cinerea)
Lupin aphids
Tulip fire

Buds

Buds

General

Capsid bug
Peony wilt
Rhododendron bud blast

Leaves

Leaves

General

Bacterial canker
Fireblight
Grey mould (Botrytis cinerea)
Honey fungus
Mealybugs
Phytophthora
Powdery mildews
Scale insects
Sclerotinia diseases
Thrips
Verticillium wilt
Vine weevil

Specific plants

Acer leaf scorch
Apple scab
Bay sucker
Brassica downy mildew
Cabbage whitefly
Cherry blackfly
Cherry leaf scorch
Clematis wilt
Cornus anthracnose
Cotoneaster - webber moth
Cyclamen grey mould
Glasshouse red spider mite
Glasshouse whitefly
Lawns - slime moulds
Lupin aphid
Narcissus leaf scorch
Peony wilt
Pansy downy mildew
Peach leaf curl
Plum leaf-curling aphid
Phormium mealybug
Potato blight
Potato cyst eelworm
Prunus: bacterial canker
Rose mildew
Snowdrops: grey mould
Tomato blight
Tomato leaf mould
Tulip fire
Viburnum whitefly

Stem

Stem

General

Bacterial canker
Damping off of seedling
Grey mould (Botrytis cinerea)
Honey fungus
Lichens on trees and shrubs
Mealybugs
Phytophthora
Saprophytic fungi
Scale insects
Sclerotinia diseases
Verticillium wilt

Specific plants

Apple canker
Clematis slime flux
Clematis wilt
Peony wilt
Potato blight

Roots, bulbs

Roots, bulbs

General

Specific plants

Carrot fly
Narcissus basal rot
Onion rot
Potato blight
Potato powdery scab
Potato rots