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www.gardeningknowhow.com/.../yellow-or-brown-boxwoods.htm

Brown or Yellowing Boxwood Shrubs. Here are some common causes of a boxwood turning yellow or brown: Winter Damage. If you live in a place that experiences freezing temperatures in the winter, your boxwood may have been damaged by excessive snow, ice and cold – or even winter burn. The cold-nipped tissues can take many months to become ...

extension.umd.edu/hgic/topics/boxwood-culture-and-diseases...

Again in home landscapes proper pruning and thinning is the most effective way to manage this disease. Boxwood Blight (Calonectria pseudonaviculata, syn. (Cylindrocladium psedonaviculatum) A new disease called Box Blight or Boxwood Blight has been causing defoliation of boxwoods throughout Europe since the late 1990’s.

homeguides.sfgate.com/boxwood-shrubs-turning-brown-62433.html

Blight. Blight is a fungal disease that causes the leaves of boxwoods to become spotted and then turn brown. This fungal disease causes massive defoliation on infected specimens.

hgic.clemson.edu/factsheet/boxwood-diseases-insect-pests

Boxwood leafminer attacks result in irregularly shaped swellings on the leaf. There may be a slightly blistered appearance on the leaf’s undersurface. Blistering may not be obvious until late summer. Infested leaves typically turn yellow or brown in splotches, are smaller and drop sooner than healthy leaves.

www.bettyongardening.com/.../boxwood-blight-how-to-recognize-it-and...

Gardening Articles » Boxwood Blight: How to Recognize It and What to Do About It Boxwood Blight: How to Recognize It and What to Do About It . Our beautiful boxwoods are under attack by a new disease. First seen in England in the 1990’s, the blight was found in North Carolina and Connecticut in late 2011. ... Blight-affected boxwood leaves ...

www.gardeningknowhow.com/.../diseases-affecting-boxwoods.htm

Boxwood is a very popular evergreen shrub for decorative edges around gardens and homes. It’s at risk for a number of diseases, though. Keep reading to learn more about diseases affecting boxwoods and how to go about treating boxwood diseases. Identifying Diseases in Boxwood

www.virginiagreenlawncare.com/...boxwood-diseases-insect-pests.html

Boxwood Diseases & Insect Pests Diseases. Decline: Boxwood decline is a poorly understood complex involving the fungi Paecilomyces, Volutella, Macrophoma and Phytophthora, as well as cold injury, drought stress, and nematodes (microscopic round worms).This phenomenon is also closely related to cultural problems associated with boxwoods, such as improper pH and nutritional status, improper ...

homeguides.sfgate.com/yellowing-boxwood-bushes-indicate...

English boxwood (Buxus sempervirens) is subject to English boxwood decline, a slow disease that starts with bronzing leaves. Leaves eventually turn orange, green, pale yellow and then brown.

www.southernliving.com/.../whats-killing-my-boxwood

The Two Main Culprits Absent a hobo who lives in your bushes and regularly relieves himself on their foliage, the probable cause of brown boxwoods is one of two soil-borne diseases -- Phytophthora root rot or English boxwood decline.The first attacks American boxwood (Buxus sempervirens), English boxwood (B. sempervirens 'Suffruticosa'), and littleleaf boxwood (B. microphylla).

extension.psu.edu/boxwood-diseases

Prune dead branches well below cankered areas. Remove dead leaves accumulated among the branches. Blight: Leaves on the lower part of the shrub have brown spots. Leaves may turn straw-yellow or bronze and fall. Twigs have long brown lesions. Under wet conditions, white fungal growth is observed on the leaves and twig lesions.