Cascades of nearly neon , purple - disconsolate flower have made jacaranda trees ( Jacaranda mimosifolia , Jacaranda acutifolia ) garden fixtures in U.S. Department of Agricultureplant hardiness zones10 through 11 . Even when not bury in peak , jacarandas dazzle with endearing twisted branches and feathery greenish leaves . Only a few insect or ethnic problems and one fatal disease prevent caviuna wood from being yr - bout dazzlers .
Bean Aphids
In the mild - winter climates where jacarandas grow , bean aphids ( Aphis fabae ) may be year - round pests . In heavy numbers , flock of the black insects cover the leave ' stems and backs , debilitate sap and give parentage to as many as five live vernal a day . The plague also cover the trees and surrounding objects with gooey transparent waste , called honeydew .
Glassy-Winged Sharpshooters
Glassy - fly sharpshootersalso run out jacaranda leaf fluid . The fluid thriftlessness they excrete dry to form a white-hot layer on the branches and nearby control surface . Besides spend a penny a mess , the 1/2 - in , transparent - winged bug transmit the deadlyXylella fastidiosabacteria . Infected jacarandas develop oleander scorch disease , an incurable status .
Insect Control
constitutive insecticidal soap controls both these pests , but arrant control on large jacarandas requires patience . Choose an clouded twenty-four hour period when the temperature is look to stay below 90 arcdegree Fahrenheit to treat the Sir Herbert Beerbohm Tree .
Things Needed
Step 1
irrigate the tree well .
Step 2
Add 5 tablespoon , or the label ’s recommend amount , of the soap concentrate to the 1 - gallon container . Top up the container with water .
Step 3
Dress in the protective clothing and safety goggles and teem the max solution into the nebuliser .
Step 4
Spray the tree until the max drips from all the leaves — include their undersurface — and branches . didder the sprayer often to keep the soap suspend . Mix more solvent if it ’s needed to nail the line .
Step 5
Repeat the program every one to two weeks , or as often as the recording label suggests , until the louse are gone .
Warning
Oleander Leaf Scorch
kill the sharpshooter on a singe - infected Brazilian rosewood does nothing to block the disease ’s progression . It start with droop yellow , coloured - margined leaf dropping from a few branch . The bacteria move inward from the steer of the leave to their groundwork , and finally through all the branches . As they punch the water - transporting xylem pipe , the tree slowly dies of thirst .
Once infect with scorch , a jacaranda is doom . rationalize the yellowed leaves when you see them may better its looks for a while , but prolonging its life only lets sharpshooter spread the disease to other plants .
Cultural Problems
Water Stress
Jacarandas stressed from too little body of water have yellow , wilted prematurely drop leaves . Those pay off too much piss have undersized leaves ; their small branch die back and their big ones may drop . Excessive watering also leaches essential mineral from the soil .
From spring to fall , water jacarandas slowly and deeply once every two weeks . During their wintertime dormancy , water just once or doubly is enough . H2O around the dripline , where rain falls to the ground from the outermost branches . Keep the trunk dry to prevent fungal contagion .
Excessive Fertilizer
Excessive fertilizing may go todamaging grease levels of mineralsor salts , causing dead foliage tips and yellowing leaf edges . If a tree has these symptom , the good way to pinpoint the mineral responsible is with laboratory soil and tissue paper tryout .
Tip
A jacaranda never require fertilizer ; at the most , drug it once a twelvemonth in spring with slow - release , 10 - 10 - 10 grain fertilizer . Sprinkle 1 tablespoonful of granules per 1 square foot of soil beneath the canopy and water well .
