The desert willow tree is a North American aboriginal that expand in dry , hot area . This multi - trunked tree is extremely drought - tolerant and can hand heights up to 25 feet , with an equal spread . The tree diagram build up a round crown with simple , dark green foliation . Its fragrant , showy blooms range in coloring from whites to lavenders . This brave tree is tolerant to most major diseases , but is susceptible to several minor fungal diseases .
Alternaria Leaf Blight
Alternaria folio blight infect the leaf and stems of the desert willow . This blight disease sprout during periods of moist , pie-eyed weather condition . The microscopic fungal spore are transport by lead and rain down onto the Sir Herbert Beerbohm Tree . The infected leaf of the desert willow tree arise small , water - soaked spots that reverse reddish - brown with age . Progression of the disease causes an increase of position , which eventually make necrosis , leafage death and defoliation . Alternaria foliage blight is easily insure by wipe out overweening wet on foliation . pig and chlorothalonil - base fungicide treatments are efficient in treating this disease .
Powdery Mildew
Powdery mildew is a foliage disease that begins as a cosmetic contagion . During periods of affectionate , wet weather , these microscopical fungal spores settle on the foliage of the desert willow . Infected leafage develops small , white spots . As these fungal spots begin to compile , they coalesce into a powdery blanched mildew that cover the surface of the leaves . Severely infect foliage develops brown topographic point and eventually dies . Heavy defoliation may also fall out . antifungal treatments are effectual in ensure and eliminating this disease .
Phytophthora Root Rot
Root guff is a prejudicial disease that infects the desert willow if it is subjected to menstruum of standing piss . This soil - borne fungal disease destroy the fine , hempen root of the tree diagram . As a result , the infected roots are unable to provide nutrients and H2O to the rest of the tree . Infected desert willow tree will display dieback , ontogenesis stunt , droop and brown foliage and drooping . Symptoms also mirror Fe insufficiency . Phytophthora rootage guff is easily avoided when the desert willow is kept in a well - drained location . antifungal treatments are usable to master the disease .
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