Winter burn, or bronzing, commonly afflicts littleleaf and Japanese boxwoods (Buxus microphylla, Buxus microphylla var. In some areas of Michigan, yearly feeding of this insect can seriously disfigure the shrubs, as damaged leaves are shed mid-summer. B. microphylla var. Colonial Williamsburg, especially around the Governor's Mansion, offers wonderful examples of formal boxwood use. 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. 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. Gardeners use … 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 boxwood is one of the most popular ornamental shrubs thanks to its cutting tolerance. Unfortunately, it is increasingly causing him pests and diseases. English boxwood's most common enemy is the boxwood psyllid, although all in the Buxus genus can be susceptible to this plant sap sucker. Through the years, the boxwood has been associated with formal gardens. 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. Protect shrubs from drought and drying winds in the autumn and winter. Boxwood leaves turns orange for two reasons, one seasonal and one disease-related, but the disturbing switch is limited to a handful of varieties. Boxwood leafminer larvae feed on boxwood leaves, making obvious "blisters" on the leaf. Winter Burn The Problem. Leaf spot: Straw-yellow leaves are dotted with small, black fungal fruiting structures. Boxwood parterres and hedges can be seen in many of the great gardens of Europe and America. Boxwood leafminer can be a serious pest of a favorite landscape plant, boxwood. Leaf burn: Leaf tips and margins yellow and redden as leaves fall prematurely. the leaf axils and are barely noticeable to the eye, but they have a distinctive aroma that irritates some people. 2) Macrophoma candollei: Only leaves weakened by winter injury are infected. 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 (Buxus) shrubs are a common sight in home gardens and commercial landscaping projects all over the world. Brown or Yellowing Boxwood Shrubs. japonica), hardy in USDA zones 6 through 9. Water stress and low temperature. 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