Although euonymus ( Euonymus spp . ) shrubs are adaptable plants and wide-eyed to care for , they are susceptible to a orbit of fungous and bacterial diseases that affect their visual aspect and increase . Hardy from U.S. Department of Agriculture plant hardiness geographical zone 4 through 9 , euonymus may be evergreen or deciduous , and are pop choice for hedge , delimitation and screens . Knowing the key characteristic of euonymus diseases can help you identify problems and successfully care for afflicted bush .
Powdery Mildew
The most common disease to afflict euonymus comes in fungal figure . Hard - to - ascendency powdery mould is distinguished by flat , gray to white growth that " pulverization " the upper farewell of your plant . If severe , it can scar and wither young growth . To forestall powdery mold , avoid overhead watering and give the bush great deal of sunshine and air . If mildew strikes , spray all the bush ’s leaves with a quick - to - use , copper - based fungicide to break off the spread . Spray until all surfaces are wet . The antimycotic agent will protect new leaves , but does not get free of powdery mildew from already infect parts of the plant life . Repeat the software program every seven day .
Anthracnose
Anthracnose is another type fungus that pretend the genus Euonymus bush . This leafage spot fungus , because of a number of differrent fungal specie , form brown maculation with gray-haired centers on leaves and twigs . The disease can result in dangerous defoliation of your shrub if entrust untreated . Prune and clean up morbid foliage and branches , using sharp bypass trimmer sterilized with household disinfectant before and after each excision . For severe cases , spray a copper fungicide in the same manner used for mold .
Cercospora Leaf Spot
Another leaf spot fungus Cercospora detructiva have distinctive spots to seem on healthy euonymus leaves . Cercospora leaf smudge is distinguishable by the comportment of varying size of dark-brown spots with the large spots bearing a grey center . While not life threatening , you may spray Cercospora leaf spot with a copper fungicide to keep the disease in check , as you would apply for treat powdery mildew . As with any disease , houseclean up fallen infected leaves to prevent further counterpane .
Scab
Some genus Euonymus species are afflicted by scab , from the fungus Sphaceloma or Elsinoe euonymi - japonici . Scab can disfigure the euonymus by causing modest gray spots encircle by orange margins to grow on leave and stems . If bequeath alone , the position farm larger , sometimes unify together . A copper - establish antimycotic agent like that for powdery mildew and leaf spot can forestall and dominance scab .
Crown Gall
The bacterium Agrobacterium tumefaciens inhabit soil and causes crest gall to form at the base of the plant . Identify crown insolence by the presence of large , knotted bile growing on the stems and root of your euonymus shrub . gall harm the water and nutritious flow to the rest of the industrial plant , causing leaves to yellow and overall growth to slow . Crown rancor is circulate by infected soil and has no remedy . However , your genus Euonymus bush can still last for several years even while infected . Prune off unsightly growth , always sterilizing your pruning cock .
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