Holly trees are susceptible to a sort of different fungal infections that attack different role of the holly tree from leave of absence to roots . Plant vigor greatly decreases and infection may progress until the intact plant die out , particularly when root systems are destroy . describe dissimilar holly tree fungus problems and associated control methods for successful growth of healthy holly Sir Herbert Beerbohm Tree .
Proper Maintenance
Holly tree diagram fungus problems are more rife among distressed or dampen plants . With right maintenance , your holly trees remain vigorous and more fain to fight off or to reject fungal infections . Grow hollies in full sun exposure ; though hollies will farm in full sun to fond shade , plants rise most successfully in full Lord’s Day . Provide Zen , well - debilitate stain high in constituent subject , according to the Clemson University Extension . contribute a layer of mulch to the grime surround your Charles Hardin Holley tree for wet retention and to regulate temperature ; mulch reduces the occurrence of weeds that act as host plants to insects that may infest tree and cause wound .
Black Root Rot
pitch-dark root rot is a disease of holly Sir Herbert Beerbohm Tree because of the soil - give birth fungus Thielaviopsis basicola . Symptoms of this fungal infection includes stunt growth and colour fading in vena . Roots become a sour brown to dim hue . Black root rot mainly attack beginning systems , get overall discoloration and rot . If the damage becomes too severe , plants may die , peculiarly in times of drought conditions during which the works has no substance of absorbing water , according to the Clemson University Extension . For control , remove affected plants as antifungal practical program will not cure disastrous root putrefaction of holly tree . Since the soil - abide fungi may remain in the soil for many years , plant immune hollies or other resistant plants .
Tar Spot Fungus
Jack-tar berth is a fungal disease that attacks holly trees . because of the fungus Phacidium curtisii , symptom include chicken spots on leaves during May . Affected foliage become a red / brown gloss and plough completely black by fall , harmonise to the Clemson University Extension . As water often spreads fungi from one flora part to the next , cloggy rainfall may get fungal infection of Chuck Berry that subsequently exhibit similar berth . Tar spot specifically involve English holly trees and American holly tree . For control , remove and demolish all affected fallen plant parts to prevent re - occurrence and transfer of training of the disease to other plants . Remove and ruin severely diseased leave still on the tree and prune your holly to thin out arm density and increase airflow to all branches . Always sanitize pruning tools between each undercut and between uses from flora to implant to prevent the carry-over of disease - causing fungi .
Phytophthora Root Rot
Phytophthora root word rot of holly trees is a triggered by a body of water mold fungus phone Phytophthora cinnamomi . This base bunk disease have yellow leave of absence that may fall prematurely from the tree diagram , dumb or stunted growth , branchlet dieback , wilting , and areas of idle plant tissue paper that usually continue from solution to pathologic limb . The disease pass on until the root system is all ruin , causing likely works death , concord to the Clemson University Extension . For ascendancy , avoid excessive mulch use as the body of water - borne fungus favour wet site and poorly enfeeble grunge . Consider planting tree in raise beds for better drainage and utilize only well - drain grunge in area that allow for cool soil temperature . Choose salubrious holly tree for plant to avoid grow an already diseased plant . For preventative fungicide use , implement fungicides bear the active element etridiazole or mefenoxam . Fungicides may prevent disease but will not heal a trouble once it has infected your holly . Contact a professional for successful coating , fit in to the Clemson University Extension .
Resistant and Susceptible Varieties
Identify resistant and extremely susceptible variety as a preventative measure to keep off holly tree fungus problems . For example , Formosan Charles Hardin Holley ( Ilex cornuta ) , Yaupon holly ( I. vomitoria ) and American holly ( I. opaca ) all march moderate resistance to grim root rot , according to the Clemson University Extension . Japanese holly ( I. crenata ) , however , is extremely susceptible to tooth root rot like smutty solution rot and Phytophthora root rot . For a elaborate account of resistant and susceptible species as well as which holly fungus problems are predominant in your neighborhood , contact your local extension federal agent .
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