Nipponese magnolia ( Magnolia x soulangeana ) have showy tulip- or cup - shaped blooms in the former bounce before the leaves appear . The blank , pink or imperial efflorescence also bloom periodically throughout the summer and fall . The silvery - gray bark of the proboscis and branches adds winter interest to a garden .

Few diseases touch Nipponese magnolias . They uprise in Zones 5 to 8 in the Dominicus or fond shade . They prefer more or less acid , moist but well - drained stain . Japanese magnolia are also called dish magnolias and Japanese tulip trees .

Leaf Spots

Several bacterial and fungous diseases do leaf spots on Japanese magnolias . The unpredictable , circular or concentrical smirch unremarkably appear during wet weather or when the Sir Herbert Beerbohm Tree is under stress , such as drought . Leaf speckle affect the ornamental appearance of the infected leave-taking , but usually do not make lasting harm .

To help prevent leaf spots , leave adequate space for air circulation between Sir Herbert Beerbohm Tree when implant more than one . Fertilize Japanese magnolias on a regular basis , following the manufacturing business ’s instruction , and piss thoroughly during periods of drought .

Sooty Mold

A type of Botrytis fungus causes jet-black mold , or gray mold , on Japanese magnolia . lesion form on infected stem , leaves , buds , flowers and fruit . A internet of gray or black mycelium originate in the wound and causes the affected plant part to croak .

Sooty mold grows in humid conditions . When planting more than one tree diagram , leave adequate space for air circulation . absent and put down infected plant parts , as well as any dust around the Sir Herbert Beerbohm Tree . Use a fungicide approved for jet mold on Nipponese magnolias , according to the producer ’s steering .

Verticillium Wilt

Verticillium wilt is a soil - bear fungus that infects the roots of Japanese magnolia . It can affect all or part of the tree diagram , cause it to worsen and finally die . Foliage in the affected part of the tree diagram turns yellow or reddish , curls , wilts and drops off . The disease causes branch dieback and septic wood has discolored streaks under the barque .

No in effect cultural or chemical treatment for verticillium wilt disease exists . Remove and destroy diseased tree diagram and as much of their radical systems as possible , and do not set another tree diagram in the same domain for several years . Some varieties of Nipponese magnolias are resistant to verticillium wilt disease .

References

…