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