Viburnum odoratissimum var . awabuki is an evergreen plant life with a spread habit . It produce 15 to 20 feet improbable and wide , and it can be pruned as a Sir Herbert Beerbohm Tree . The small fragrant bloom are come after by bright crimson Berry that turn black . Viburnum awabuki is hardy in zones 9 to 11 and grows good in well - drained soil in full Lord’s Day . Plants that are in the shade or site too close together are more prone to disease . Most diseases and pests on Viburnum awabuki do not cause serious damage , although a few diseases can kill septic plants .
Pests
Damage triggered by pestilence that tip on the leaf of Viburnum awabuki affects the show of the plant but normally does not harm it . curl up or seethe leaves are symptoms of aphid or thrips infestations . Thrips also cause purplish - red spots on the underside of the leaf , where they scratch up the cells and suck the sap . Spider mites are participating in the cool weather of spring and fall when they pierce the foliation and feed on the sap . The leaves wrench gray - brown , the folio tissue collapse and the leaf drops prematurely .
Adult root weevils only feed on the leaves , but the larvae chew on the roots . When the source are girdled , the leaf change by reversal pallid dark-green or yellow , the plant declines and it finally dies . you could launder aphids off the leafage with a potent nebuliser of water . insecticide O.K. for genus Viburnum can be used at the rate and schedule recommend by the manufacturer to manipulate or eliminate thripid , wanderer mites and root weevil .
Leaf Spots
Bacteria , fungi or algae can stimulate leaf spots on Viburnum awabuki . Bacterial leaf spots set about as water - soaked areas that rise into deep-set brownish area . septic farewell should be murder and destroy to prevent the spread of the disease . fungous leafage spots pass during warm moist summer months . Grayish to reddish brown , angular or unpredictable patches commonly appear on the older leaf first . Cercospora , Phoma and Phyllsticta are common fungal agents on viburnums . Remove and destruct septic foliation , and use a fungicide for viburnums pursue the manufacturer ’s directions . Algal leaf spots , triggered by Cephaleuros virescens , grow in nerveless moist condition . The little wan green spots change by reversal light or reddish brown with years . habituate a fuzz - based fungicide according to the maker ’s instruction , and remove and destroy infected leafage .
Other Diseases
The fungus Botryosphaeria infects punctuate plant and induce cankers , arm dieback , and rapid browning and wilt of leaf . Prune and demolish infected plant parts , and hold a fungicide for Viburnum to the pruning cut following the manufacturer ’s instructions . Erysiphe sparsa fungus causes powdery mildew during humid weather with warm sidereal day and nerveless nights . The white to grayish dusty growth is usually worse on young leafage and shoots . Another fungus , Plasmorpara vibumi , causes downy mildew during cool or ardent loaded conditions . scant green spots develop on the upper control surface of infected leave , and grayish fungal masses grow on the bottom . Both can be do by with a fungicide for genus Viburnum harmonise to the manufacturer ’s direction .
Bacterial tip galls develop on the lower stems of Viburnum awabuki . Remove and destroy the touched plant , and do not replant the sphere with a viburnum . Armillaria root decomposition is also called mushroom root hogwash or shoe lace source rot . White feltlike mats and inglorious strands of fungal growth develop under the barque on the crown and upper ascendant . The unnatural plant life has yellow leave and stunted growing , and it finally dies . Remove the plant , its roots and ring soil ; do not replant the septic surface area .
