How do you save a dying holly tree?

Prune the existing infected leaves from the bush with pruning shears. Remove all leaves with signs of insect infestation. Apply an insecticide soap containing carbaryl to the leaves. The carbaryl will rid the bush of both scales insects and leaf miners.

What does holly blight look like?

This disease begins as small, yellow spots on the leaves, which eventually become reddish brown to black in color and drop out, leaving holes in the foliage. Always remove and destroy infected foliage.

What do you spray holly bushes with?

One of the less toxic pesticides available for holly plants is horticultural oil. This pesticide, sprayed thoroughly with special attention to the undersides of the leaves, smothers insects on the holly. Horticultural oil — also called narrow-range, supreme or superior oil — is made from petroleum products.

How do you treat powdery mildew on holly bushes?

Spraying with neem or horticultural oil controls light-to-moderate powdery mildew outbreaks. These oils damage plants treated with sulfur during the previous two weeks and those sprayed when temperatures are above 90 F. Always apply these fungicides according to their label specifications.

How do you treat holly leaf blight?

Holly leaf spot diseases are usually more severe after wet springs, but they rarely warrant fungicide controls. Fungicide sprays protect the new green shoots and leaves. Begin sprays as the buds swell and reapply 2-3 more times at label intervals to maintain protection during vulnerable periods.

What is the black stuff on my holly bushes?

Sooty mold, a disease caused by the Capnodium fungus, looks like a black, powdery layer of soot on holly leaves and berries. The fungus grows on honeydew, a sweet, sticky substance excreted by soft scale insects after feeding on plant sap.

What is the white stuff on my holly?

White spots on holly leaves can almost always be chalked up to one of two things – scale or mites. Both are tiny pests that stab into the leaves of the plant and suck out its juices.

Do holly bushes get powdery mildew?

Powdery mildew is most common on holly bushes growing in areas of heavy shade, with poor air circulation. High humidity promotes disease development, but not when the leaves are wet. Powdery mildew fungi prefer to attack young succulent plant tissues, but will infect older leaves as well.

What is white stuff on underside of holly leaves?

Known as “cool weather mites” these pests typically become most active during spring and fall. Mites feed by sucking out plant tissue, primarily on the undersides of leaves. The white spots on the undersides of leaves are the cast skins of southern mites.

What is eating my holly leaves?

Deer, squirrels, and other small mammals will devour Ilex opaca (American holly) and the berries are an important source of food for as many as 18 species of birds. While there are a number of insect pests that may chew on hollies, that is unlikely at this time of year.

Why are the leaves falling off my holly tree?

Causes of Unhealthy Leaf Drop in Hollies

Watering problems: Lack of water, excessive water or poor drainage can cause leaves to yellow and fall off; this can happen at any time of year.

What is powdery mildew?

Powdery mildew is a common fungus that affects a wide variety of plants. It is easily identified and appears as light grey or white powdery spots usually found on infected leaves, but can also be found underneath, or on stems, flowers, fruit or vegetables.

Why are my holly bushes dying?

Large brown splotches on the leaves, especially around the edges, can be a sign that your holly plant has sustained weather damage, such as a sudden cold snap or a prolonged dry period. If rainfall drops below 1 inch per week, water your holly to ensure the roots are receiving enough moisture.

Why are my holly leaves turning black?

On hollies, these black, fuzzy leaves are indicative of an infestation of soft scale insects; the blackened leaves are covered in sooty mold colonies, which feed on the sticky, sweet honeydew these pests produce.

Will holly leaves grow back?

Holly shrubs normally shed some leaves each spring. They grow new leaves and discard the older leaves when they are no longer needed. Loss of older leaves to make room for the new season’s growth is common among many evergreens, including both broadleaf and coniferous trees and shrubs.

What is the best fertilizer for holly bushes?

Fertilizing Holly Bushes

Compost or well-rotted livestock manure makes excellent (and often free) slow-release fertilizers that continue to feed the plant throughout the season. A complete fertilizer that contains eight to ten percent nitrogen is another good choice.

How do you treat black mold on holly?

Spray your hollies with a botanical pesticide such as neem oil or horticultural oil. Saturate the entire plant to kill the bugs. Repeat treatment weekly or until the infestation is under control. The black mold will then disappear on its own.

When should you trim holly bushes?

It is best to prune holly while the plant is dormant – in winter. Always be sure the pruning cuts are clean and smooth to encourage rapid wound healing. And cut branches just above new leaf buds. Always remove any dead, damaged or diseased branches. to prevent entry points or build-up chambers for diseases and pests.

What time of year should holly bushes be trimmed?

So for best outcome and to ensure your hollies aren’t unduly stressed, wait until late winter or early spring — just as the plant breaks dormancy — before you do any major downsizing. By waiting till your hollies are about to begin active growth, you’ll also avoid several months of a skeleton appearance.

What fungus grows on holly bushes?

Tar Spot: This disease is caused by the fungus Macroderma curtisii (formerly named Phacidium curtisii and Rhytisma curtisii). Yellow spots appear on the leaves of American and English hollies in May.

What does black sooty mold look like?

As the fungi grow, they produce dark mycelial threads that look like soot. These can be small and blotchy or large, black masses that cover large areas of the foliage, stems, and in some cases, fruit and vegetable crops. Sooty mold fungus travels along with plant-attacking insects such as aphids.

How much can you cut back holly bushes?

Deciduous hollies are in a pruning category all their own. These vigorous growers should be thinned back every year in late winter to improve their shape and encourage new growth. Stems that are thicker than a thumb should be cut to the ground, but never remove more than one-third of the shrub.