Winter burn, or bronzing, commonly afflicts littleleaf and Japanese boxwoods (Buxus microphylla, Buxus microphylla var. Brown or Yellowing Boxwood Shrubs. Through the years, the boxwood has been associated with formal gardens. With a smaller overall stature as well as smaller leaves than the common species, you’ll see a few variants of this type, and breeders may choose to write these on plant labels in a variety of ways. koreana, aka Korean boxwood, is a littleleaf variety that is suited to Zones 4-9, making it a good option for northern growers. Leaf spot: Straw-yellow leaves are dotted with small, black fungal fruiting structures. B. microphylla var. japonica), hardy in USDA zones 6 through 9. Here are some common causes of a boxwood turning yellow or brown: Winter Damage. Boxwood (Buxus) shrubs are a common sight in home gardens and commercial landscaping projects all over the world. Boxwood leaves turns orange for two reasons, one seasonal and one disease-related, but the disturbing switch is limited to a handful of varieties. In some areas of Michigan, yearly feeding of this insect can seriously disfigure the shrubs, as damaged leaves are shed mid-summer. Leaf burn: Leaf tips and margins yellow and redden as leaves fall prematurely. Colonial Williamsburg, especially around the Governor's Mansion, offers wonderful examples of formal boxwood use. Boxwood leafminer can be a serious pest of a favorite landscape plant, boxwood. Cultivars / Varieties: 'Arborescens' Lustrous dark green leaves 'Aureovariegata' Variegated leaves 'Elegantissima' White leaf margins 'Fastigiata' 'Suffruticosa' Dense, compact, slow growing, leaves fragrant, considered to be least tolerant to box leaf miners. boxwood psyllid, boxwood leaf minor, boxwood mite , nematodes and phytophthora root rot can be problems as well as other insects and diseases foliar burn in exposed sites or during harsh winters foliage produces a distinct fragrance some dislike Boxwood leafminer larvae feed on boxwood leaves, making obvious "blisters" on the leaf. Boxwood parterres and hedges can be seen in many of the great gardens of Europe and America. Winter Burn The Problem. Macrophoma candollei: Only leaves weakened by winter injury are infected. Unfortunately, it is increasingly causing him pests and diseases. Here we explain the most common problems and what you can do about it. Protect shrubs from drought and drying winds in the autumn and winter. Boxwood leafminer (Monarthropalpusi flavus) is a common and destructive pest that causes significant damage to boxwoods here in the Dayton area, although the symptoms are often mistaken for winter injury rather than insect infestation.Since boxwoods are such a popular shrub, it’s important to control leafminers so they don’t spread to neighboring plants and properties. All photos by Rebecca Finneran, MSU Extension. General Information Scientific name: Buxus sempervirens Pronunciation: BUCK-sus sem-pur-VYE-renz Common name(s): common boxwood, common box, American boxwood Family: Buxaceae Plant type: shrub USDA hardiness zones: 6 through 8 (Fig. The boxwood is one of the most popular ornamental shrubs thanks to its cutting tolerance. 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. 2) Water stress and low temperature. 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