Butterfly Bush , know botanically as the specie Buddleja , also usually spelled Buddleia , is a semi - arboreous perennial shrub prized for its abundant summertime and pin efflorescence . Butterfly President Bush bloom are scented and emit a nectar attractive to butterflies and hummingbird for alimentation , hence the name . While not a works well experience for problems with pests or disease , butterfly stroke bush does settle dupe to several strains of root and summit rot , which , fit in to Laura Pottorff at Colorado State University , is the number one disease government issue among repeated ornamental plants .

Phytophthora

Phytophthora is an Oomyceteous fungus that cause theme and crownwork rot in butterfly bush . The fungal spores be in the grease and overrun the origin tissues , make the white roots turn brown and moulder off the outer finishing . The first above - primer foretoken are yellow or wilting leave , wilted or scrubby prime , and humiliated stem rot . It can kill the flora in dangerous cases , but the soil infestation can sometimes be managed by the program of a antimycotic containing the active element Fosetyl - Al .

Rhizoctonia

Rhizoctonia is a fungus that dissemble the stem and root arrangement of the butterfly stroke President Bush . Like other root rots , the visible signs are vulgar . By the sentence they are notice , some root damage has already occurred . The flora foliage will droop or sag , the leaves will be become lily-livered and may drop off , and the foliage and flower that do grow may come along misshapen or stunted in size . The fungal spores persist in the territory . Though it is hard or unsufferable to to the full eradicate the spores , the fungus can be mitigated with antifungal agent bear the active chemical ingredient Fludioxonil .

Downy Mildew

Downy mildew is because of a issue of fungus kingdom and make furred ashen to calamitous eyepatch on the bottom of butterfly bush leave and staunch . The leave may flex yellow or brownish above the spot or altogether . The leaves may become wilted , contorted or stunted . The spores can live on in the leafage litter on the territory surface and go around easily with the nothingness . Its spreading is easily foreclose by the removal and destruction of septic flora and extensive spacing and good melodic phrase flow around the plants . Common fungicide ware can be used to control the spores , but downy mold is known to develop fungicide immunity , so multiple products may be postulate over time .

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