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