hydrangea are a normally hardy works that may fall victim to some serious disease and plague problems . Some of these , include fungal , bacterial and environmental , may cause a discoloration of the leaf . These illnesses may turn the normally green leaves dark brown or disastrous , which is ordinarily a sign that handling is ask . Most problems with inglorious parting are treatable , especially in the former stages . Treatment methods and difficultness calculate largely on the cause and extent of the malady .
Step 1
discussion of black leaves can occur once you ’ve identified the illness . leafage with dim spots cause by bacterial infections need different treatment than those with a fungal infection , and treating the wrong illness will most probably be ineffective . Mildews and mold require more in - depth treatment than spot have by over sunning or watering the hydrangea .
Fungal Infections
Infections from the Alternaria , Coniothyrium and Rhytisma species of fungi are among the most common effort of black leaves in hydrangea . look on the specific case , these infections may produce black spots or turn whole leaf black . Most fungal problems require a multifaceted approach to rid the hydrangea and soil of trouble . First , remove all unnatural leaves , staunch and flowers to prevent further spreading . secondly , growers should hold an appropriate antimycotic according to the promotion instruction . This procedure will stop the fungi from spreading to other plants , and will clean the land so the bacteria do n’t devolve .
Step 2
Bacterial Infections
hydrangea suffer from fewer bacterial infections than fungal infections , though some will still change state leaves black . If growing conditions are not optimum , especially if too much water is present , bacteria can overwhelm soil and leaves , creating conditions where necrotic spots will begin to turn leaves ignominious . The most common bacterial infection is in the Pseudomonas family , though Xanthomonas and Corynebacterium are close behind . Each case can cause dark leaves on a hydrangea . Most of these bacterial problems will begin in the dirt and progress until the parting have died and fallen . Cure the problem by removing and supersede contaminated soil and removing infected part of the plant .
Over Watering
Over watering may be a serious problem for potted or outdoor grown hydrangeas . If urine is leave to sit down at the roots , radical decomposition may take keep . If pull up stakes untreated , roots reverse gray and drippy . As the disease build , foliage will turn dark brown or black at the edges before untimely falling off . Hydrangeas require watering once per week , anymore than that is too much . Soil should promote adept drain to prevent bacterial maturation and other problems .
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