Common Shrub Diseases

Common Shrub Diseases

Rust


Plants affected: The most commonly affected are broad beans, roses, fuchsia and hollyhocks

Symptoms: Patches of irregular discoloration on the foliage and stems. On close inspection these are circular and tend to be dark orange, brown, yellow or red spots on the undersides of the leaves

Control: Remove infected material and burn or dispose of. Do not compost. Make regular check ups to catch it early. If you want to use a chemical, select one containing mancozeb, penconazole or flutriafol.

Coral Spot


Plants affected: Tends to affect broadleaf trees and shrubs, for example Acer, Fagus, and Carpinus. This fungus only attacks dead plant material.

Symptoms: Small coral orange/pink raised spots that form after the branch has died. Dieback occurs and if the infection spreads down to the crown the whole plant may die

Control: Prune out all the dead and dying branches cutting back into healthy stems, dispose of the rubbish to prevent the fungus from spreading. There is no chemical control

Mould


Plants affected: Most fruits and vegetables, ornamentals, shrubs and trees

Symptoms: Infects all top-growth parts of the plant which are usually stressed as a result of drought or nutrient deficiency. A common sign is grey mould on leaves, stems and flower buds. Before the mould appears there could be dead brown patches on the leaves and also rotting on some of the plant stems.

Control: Remove all dead and damaged plant material before it becomes infected. Begin a programme of watering and feeding and isolate infected plants if possible. You can use a chemical containing myclobutanil or penconazole

 

Black Spot


Plants affected: Can be found on shrubs and roses

Symptoms: Leaves are marked with purple or brownish black spots that turn yellow and cause premature leaf drop. Smaller spots can also discolour the stems and after a while the plant will weaken

Control: Affected leaves must be promptly destroyed along with any stems that show signs of infection. The best way to prevent black spot is to lay a thick mulch around the plants. This helps to lock the moisture in the ground and reducing evaporation of moisture from around the roots. Spray with a fungicide containing myclobutanil fortnightly from early Spring, just as the new foilage emerges

Canker


Plants affected: Can find it on apples, pears, rowan, beech and other broad leaved trees. Spread is by rain splash.

Symptoms: Leafless shoots or twigs with sparse, small foliage. Bark that is sunken or distorted. Stems can be cracked and swollen and bear small red or white pustules

Control: During dry conditions only, use clean, sharp secateurs to prune out the infected area to new healthy growth, making sure that you sterilise the secateurs after each cut to minimise spread. Thouroughly clean the secateurs when you have finished. Spraying fungicides containing myclobutanil and mancozeb during Spring and Summer.

Clematis Wilt


Plants affected: Found on clematis, usually the large flowered cultivars.

Symptoms: The top of a clematis plant suddenly wilts, collapses and dies back.The problem quickly spreads down through the plant. Wilt spreads from a leaf, the stalk turns black. It is caused by a fungus that enters through a wound on soft growth made by plant ties or insects.It spreads by water splash.

Control: Cut back affected stems to healthy growth, even if it means cutting below ground level. Clear away all infected parts and mulch around where the new shoots will appear. The clematis should send up fresh new shoots. If the problem returns, replant deeply in rich fertile, well drained soil, mulch the area with slate or gravel to keep it cool 

Leaf Miner Fly


Plants affected: Many shrubs, perennials, veg, fruit trees and bushes

Symptoms: A maze of beige or white trails appear and spread just below the upper surfaces of leaves

Control: Pinch off affected leaves as soon as the first wiggling trails are seen and dispose of them 

Mildew


Plants affected: Can be found on veg, shrubs

Symptoms: The fist sign of mildew is the powdery white coating on the leaf that if left alone can stunt the plants growth and even dieback

Control: Make sure that the plants are well spaced out with air in between, mulch the area to keep the moisture in the ground and water regularly. The moment mildew is spotted prune out any affected areas and destroy. There is an all purpose feed rather than one that is high in nitrogen that generates soft new growth that can be prone to infection. Spray with myclobutanil.

 

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