Often plant for its alter , colorful foliage , red barberry ( Berberis thunbergii ) , also call Nipponese barberry , is a medium - size deciduous bush that grows 3 to 5 metrical unit high . Its leave are purple during saltation and summertime , then turn orangish , red and yellow in autumn . Tiny , fragrant yellow flowers in spring grow into diminished , ruby-red Charles Edward Berry that stay on the George H.W. Bush through the wintertime . Barberry has lilliputian thorn , or barbs , that are not readily seeable until you touch the branches . It is excellent embed as a boundary hedge to keep out small animals . Barberry mature best in full sun and well - drain filth .

Anthracnose

A common fungal disease that attacks evergreen and deciduous trees and shrubs , anthracnose can appear slightly different on different varieties . On barberry it appear as dark-brown orotund stain with reddish gross profit margin on the upper control surface of the leaves . It also infect young twigs and leave that are in the uncurling level of growth . Athracnose is well plow by removing affected parts of the bush and watering at grime level . Fungal infection are spread out chiefly when the foliage is wet . Anthracnose does not spread out during dry condition .

Powdery Mildew

Found in most gardens , powdery mold is a fungous infection that appears as a white-hot or gray powder - like emergence on leaves , flowers and root word . The leaves may curve and twist before the ashen powder is visible , with severe infections turning leaves yellow or brown with the new shoots and flowers disfigure . The salutary prevention is to space plants far enough apart that strain can circularize between them . Hitting the affected plants with a warm spray from a garden hose may help to reduce the infection . To effectively moderate powdery mildew , trace a even spray political program as soon as the first signs of the disease are unmistakable . Use fungicides that are design for manipulation on powdery mildew and follow the maker ’s instructions .

Rusts

Rusts consist of a social class of several varieties of fungi that infect trees and shrubs such as crimson barberry . Its symptoms are reddish - orangeness masses of spore that form on the lower leaf surfaces . The upper side of the foliage turn yellow or brown and usually prematurely drops off the barberry shrub . Control the spread of these fungi by prune off and destroy infected office of the plant as soon as they come along . Water from below as fungal diseases are easily spread when leaf is wet .

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