The boxwood is one of the most popular ornamental shrubs thanks to its cutting tolerance. Winter Burn The Problem. koreana, aka Korean boxwood, is a littleleaf variety that is suited to Zones 4-9, making it a good option for northern growers. Boxwood leafminer larvae feed on boxwood leaves, making obvious "blisters" on the leaf. 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 (Buxus) shrubs are a common sight in home gardens and commercial landscaping projects all over the world. Macrophoma candollei: Only leaves weakened by winter injury are infected. English boxwood's most common enemy is the boxwood psyllid, although all in the Buxus genus can be susceptible to this plant sap sucker. Here we explain the most common problems and what you can do about it. In some areas of Michigan, yearly feeding of this insect can seriously disfigure the shrubs, as damaged leaves are shed mid-summer. Here are some common causes of a boxwood turning yellow or brown: Winter Damage. 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 Leaf burn: Leaf tips and margins yellow and redden as leaves fall prematurely. Through the years, the boxwood has been associated with formal gardens. Boxwood leaves turns orange for two reasons, one seasonal and one disease-related, but the disturbing switch is limited to a handful of varieties. Gardeners use … Boxwood leafminer can be a serious pest of a favorite landscape plant, boxwood. Winter burn, or bronzing, commonly afflicts littleleaf and Japanese boxwoods (Buxus microphylla, Buxus microphylla var. Leaf spot: Straw-yellow leaves are dotted with small, black fungal fruiting structures. Facts on the Boxwood Shrub. Colonial Williamsburg, especially around the Governor's Mansion, offers wonderful examples of formal boxwood use. B. microphylla var. 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. the leaf axils and are barely noticeable to the eye, but they have a distinctive aroma that irritates some people. Brown or Yellowing Boxwood Shrubs. 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. Protect shrubs from drought and drying winds in the autumn and winter. 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. 2) Water stress and low temperature. Unfortunately, it is increasingly causing him pests and diseases. 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. japonica), hardy in USDA zones 6 through 9. Boxwood parterres and hedges can be seen in many of the great gardens of Europe and America. As leaves fall prematurely gardens and commercial landscaping projects all over the world some areas of Michigan yearly... And America, or bronzing, commonly afflicts littleleaf and Japanese boxwoods ( )! 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