Garden Plant diseases symptoms and remedies.




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  Page 18
Garden Plant Symptons - Shoots Dis-coloured
Wooly aphids
(Shoots discoloured)
Plants affected:
Apples, cotoneaster, pyracanthas, crataegus and sorbus.
Woody swellings and tufts of white wool on trunks and branches.
Wooly aphids- Image of affected plant.
Where possible, brush a spray-strength solution of malathion or BHC on to affected areas when wool first appears or to apply one of these as a spray. Systemic insecticide such as dimethoate or formothion may also be used.
Mealy bugs
(Shoots discoloured)
Plants affected: Greenhouse and house plants, especially cacti, other succulents and climbers.
Symptoms: Colonies of mealy bugs covered with mealy or waxy wool usually concentrated around buds and leaf axils.
Mealy Bugs Image of infected plant.
Treatment: Spray thoroughly with systemic insecticides such as dimethoate or formothion or with non-systemic insecticides such as malathion or nicotine.
Bacterial canker
(Shoots discoloured)
Plants affected: Cherries, plums, gages, damsons and ornamental prunus species.
Symptoms:  Elongated, flattened, canker-bearing exudations of gum on shoots that are dying back; leaves yellow and wither prematurely.
Bacterial canker-image of infected plant
Treatment:  Cut out infected branches and paint all wounds with a wound-sealing compound. Spray the foliage in mid-October with Bordeaux mixture. Prune during the summer only.
Powdery mildew
(Shoots discoloured)
Plants affected: Euonymus michaelmas daises, roses, gooseberries, apples and many other types.
Symptoms:  White, powdery coating on shots.
Plant disease symptons -Powdery mildew
Treatment: Cutout severely affected shoots on trees and shrubs in the autumn. Spray regularly with benomyl,dinocap or thiophanate-methyl. Lime sulphur can be used on some types of apples and copper and sulphur sprays can be used on herbaceous plants and shrubs in hedges. In the greenhouse, fumigate with dinocap smokes.
Moths on garden plants
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