![]() ![]() Various species of nematodes (microscopic worms that feed on the roots) also appear to be involved (see Nematodes section below). Dead areas or cankers develop along branches or near the crown. Leaves often have pink eruptions of spores on black fruiting bodies. ![]() ![]() The older leaves drop prematurely, and the remaining foliage develops a yellow color. Dead or dying branches occur randomly in the bush. Symptoms consist of weak and spindly plants. More than one problem may exist on stressed boxwoods. Volutella buxi may cause a dieback or stem blight on English and American boxwoods and often follows winter injury (see the Canker section below). M acrophoma candollei can cause leaf blight, but it usually acts as a weak pathogen following root diseases or environmental stresses. Root rots by Phytophthora are usually more of a problem in wet soils (see Root Rot section below). However, Paecilomyces buxi has been consistently associated with roots of English boxwood exhibiting the syndrome of boxwood decline, and this decline often follows periods of drought stress. This phenomenon is also closely related to cultural problems associated with boxwoods, such as improper pH and nutritional status, improper irrigation, poor drainage, and improper mulch management. DiseasesÄecline: Boxwood decline is a poorly understood complex involving the fungi Paecilomyces, Volutella, Macrophoma, and Phytophthora, as well as cold injury, drought stress, and nematodes (microscopic round worms). Boxwood is susceptible to the following diseases and pest problems. For information on species, varieties, and culture, see HGIC 1061 Boxwood. Boxwoods ( Buxus spp.) are adapted to a wide range of light conditions and prefer fertile, moist, well-drained soil, which is amended with organic matter. ![]()
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