Pieris (plant) in the context of "Sudden oak death"

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⭐ Core Definition: Pieris (plant)

Pieris (/ˈp.ərɪs/ or /ˈpɪərɪs/) is a genus of seven species of shrubs in the flowering plant family Ericaceae, native to mountain regions of eastern and southern Asia, eastern North America and Cuba. Known commonly in North America as andromedas or fetterbushes, they are broad-leaved evergreen shrubs growing to 1–6 metres (3–20 ft) tall and 0.9–3.0 m (3–10 ft) wide. The leaves are spirally arranged, often appearing to be in whorls at the end of each shoot with bare stretches of shoot below; they are lanceolate-ovate, 2–10 cm (1–4 in) long and 1.0–3.5 cm (121+12 in) broad, leathery textured, and with an entire or serrated margin. The young leaves in spring are typically brightly coloured. The flowers, which may have a very appealing honey scent, are bell-shaped, 5–15 mm (316916 in) long, white or pink, and arranged in racemes 5–12 cm (2–4+12 in) long. The fruit is a woody capsule which splits into five sections to release the numerous small seeds.

Pieris species are used as food plants by the larvae of some Lepidoptera species including the engrailed.

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👉 Pieris (plant) in the context of Sudden oak death

Phytophthora ramorum is the oomycete known to cause the disease sudden oak death (SOD). The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe. Symptoms include bleeding cankers on the tree's trunk and dieback of the foliage, in many cases leading to the death of the tree.

P. ramorum also infects a great number of other plant species, significantly woody ornamentals such as Rhododendron, Viburnum, and Pieris, causing foliar symptoms known as ramorum dieback or ramorum blight. Such plants can act as a source of inoculum for new infections, with the pathogen producing spores that can be transmitted by rainsplash and rainwater.

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