Wetwood

Pest: Wetwood (includes various species of bacteria and some yeast)

Pest Type: Infectious disease, bacteria and yeast

Major Identifying Features: Discolored wood, water soaked, exuding sour or rancid, reddish or brown fluid from bark cracks or wounds

Life Cycle: Wetwood-causing microorganisms are common in soil and water and infect trees through wounds, other bacteria grow within the tree and use sap as a nutrient source and causing fluid to exude from the bark, only trees 10 years old and older show symptoms of wetwood

Pest Rating: Minor to moderate

Management Rating: Moderate

Host/Season/Outbreak Information: Wetwood is especially common in elm and poplar, but also in box elder, fruitless mulberry, hemlock, magnolia, maple, oak

Damage Information: Foliage wilt and branch dieback may occur on severely infected trees, but the disease rarely causes serious harm to trees

Management Options: avoid physical damage to bark and wood

Sources:

http://www.ipm.ucanr.edu

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