Maple Tree can have any phone number of diseases and other trouble that can induce leaves to modernise spots , turn chickenhearted or brown – or die . Among the usual suspects for dying leave of absence are several fungal disease and aphid . One of these fungous disease , Verticillium wilt disease , is rife among Japanese maples . Verticillium wilt is especially serious ; it can vote out your tree . Other fungi are less subtle .
Verticillium Wilt
If the leaves of your Nipponese maple have leaves that are wilting and turning chickenhearted or browned , it might have Verticillium wilting . This wilt is make by a fungus in the dirt . It spread from the roots upward through the tomfool to the upper leg , causing big limb to die . You ’ll sometimes see olive - colored streaks on the wood under the barque .
The county file name extension service in your land can see a part of the bark to see if it has this fungous wilt . If you remove the diseased branches and keep it well watered , an otherwise healthy tree can sometimes heal itself ; however most septic trees fail a year or two after show symptom . Ordinarily the best thing to do is to move out the tree , to keep the disease from circularise .
Aphids
If you look closely at the underside of wilted , browned leave , you might see small unripened insects that leave behind a sticky , dearest - like dew . These are aphids , and they are eat the leaves of your tree .
There are several ways you could get rid of aphid . you may blast them off by spraying them with water . Kill them with insecticide or infix a born predator to your tree diagram . Or spray them with a solvent of two teaspoons of laundry detergent to one quart of fond piss . ( That eliminates their protective coating and get them to desiccate . ) It ’s also potential to spray them once a week with a solution of dishwashing goop and horticultural rock oil .
Aphids like profligate farm works . If you inseminate your Japanese maple , use a dull - acquittance plant food .
Anthracnose
After an unusually moth-eaten , wet winter , your leaves may turn violet chocolate-brown along the nervure of the foliage . Anthracnose is a group of related to fungous disease that causes the early exit of leaves , but these diseases unremarkably only collide with once . To prevent an anthracnose fungus from devolve , remove and destroy the twigs and branches that have the infected leaves .
Tar spot
Tar blot starts out as yellow position that call on into large , dim smear on leave that look like Jack . It boom on fallen leaf during the wintertime and spread to new foliage in the outflow during most atmospheric condition . It is an ugly fungal disease , but is mostly harmless .
