Not get the edible cranberry associate with Thanksgiving , the highbush cranberry ( Viburnum opulus var . americanum ) does produce attractive clusters of diminutive berry worthwhile for an autumn - theme landscape . Best arise in U.S. Department of Agriculture Plant Hardiness Zones 3 through 7 , this North American deciduous shrub is in general disease and pest loose . Many compendious varieties exist today , yield gardener extensive pick for fledged bush sizes or fruit colouration . The former botanical name for this plant is Viburnum trilobum .

Bacterial Leaf Spot

Michael Dirr , author of " Viburnums , " remark that bacterial foliage spot occasionally inflicts ocular black spots on the oldest of shrub folio . stomach the minimum leafage drop that occurs in later summer before the leaf turn color and drop away in autumn .

Botryosphaeria Canker

Highbush cranberry appreciates moist to even sloughy grime conditions . If suffering under prolonged drought conditions , the bush may lose foliage on branch infest with Botryospaeria pestilence . leafage first wilt and drop away and the offset become laced with a brown to smutty pimple - like fungal fruiting bodies . The underbark of branches sprain dark brown . The spoiled - case scenario is these folio untimely drop off . Prune away diseased branches and water sick plants .

Downy Mildew

too wet leaping weather can lead to downy mildew on foliage because of the fungus Plasmopara viburni . lean spot that are confined by the foliage veins modernize into blotch that wilt and break . Severely harm leaves physically discharge - off . A light - colourise downy mold sparsely cloaks the spots on leaf undersides . Avoid wet foliation in springtime with overhead irrigation and rake up fallen leaves each fall and destory them – do not compost these fungus - infect leave .

Powdery Mildew

Little damage results from the bearing of powdery mildew on highbush cranberry leaves , although the ashen fungal growth may see rather shocking . Michael Dirr recommends only digest powdery mildew if it does rear itself since it does n’t really injure the plant .

Occasional Disease Concerns

Even though highbush cranberry originate without much risk of disease problem , regional soils or other factors may find plant visit with disease other than the four aforementioned . Other possible diseases on this shrub include crown gall , rust , post anthracnose and verticillium wilt . If you’re able to not indentify the disease job , take a sample distribution of the affected leaf or branch to your local cooperative extension office or plant disease professional for help .

References

…