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Armillaria Crown and Root Rot

Armillaria mellea

36 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Trees decline gradually with cankers at base and white fungal fans visible under bark at crown. This root rot spreads through root contact. Remove infected trees and avoid replanting susceptible species.

When clearing a new site of forest trees and shrubs or when clearing a site with infected plants (infection centers) there are several precautions to take.Girdle large trees before removal to hasten decay of roots.After removing aboveground vegetation, clear soil of stumps and large roots. Deep-rip the soil in more than one direction to bring large roots to the soil surface.

Quick Reference

Causal Agent
Armillaria mellea
Host Plants
36

Management

Cultural Controls

  • When clearing a new site of forest trees and shrubs or when clearing a site with infected plants (infection centers) there are several precautions to take.Girdle large trees before removal to hasten decay of roots.After removing aboveground vegetation, clear soil of stumps and large roots.
  • Deep-rip the soil in more than one direction to bring large roots to the soil surface.
  • If possible, remove all roots greater than 1 inch in diameter from the soil.Burn all woody debris.Leave this ground fallow at least 1 year.
  • Trenches lined with plastic sheeting may help if inoculum is from an adjacent stand.
  • If using drip irrigation, move drip-line emitters away from the trunk and in between trees after first year of planting.
  • Permanently removing soil in a 3-ft radius around the crown and main trunk root area has been effective in citrus and other tree fruits grown in California and Australia and may be of benefit for managing infected trees in the Pacific Northwest.

Host Plants (36)

Prunus americana Wild Plum American (Red) Plum August Plum, Goose Plum Prunus armeniaca Apricot Prunus avium Sweet Cherry Prunus besseyi Sand Cherry, Western Sand Cherry Prunus blireiana Blireiana Plum Prunus caroliniana Carolina Cherrylaurel American Cherrylaurel Prunus cascade Prunus cascade Prunus cerasifera Cherry, Plum Prunus cistena Purpleleaf Sandcherry Redleaf Sandcherry Cistena Sandcherry Cistena Plum Prunus dream Prunus dream Prunus emarginata Bitter Cherry, Wild Cherry, Quinine Cherry Prunus first Prunus first Prunus fruticosa Steppe Cherry, European Dwarf Ground Cherry, Mongolian Cherry Prunus glandulosa Dwarf Flowering Almond Prunus ilicifolia Hollyleaf Cherry, Holly-leaved Cherry Prunus laurocerasus Cherry, Laurel Prunus lusitanica Portugal Laurel Prunus maackii Amur Chokecherry Amur Cherry, Manchurian Cherry Prunus mume Japanese Apricotc Japanese Flowering Apricot Japanese Flowering Plum Prunus newport Newport Flowering Plum Prunus okame Okame Flowering Cherry Prunus padus European Birdcherry Common Birdcherry Prunus prostrata Rock Cherry, Mountain Cherry Prunus sargentii Sargent Cherry, Sargent's Cherry Prunus serotina Black Cherry, Rum Cherry Prunus serrula Birchbark Cherry, Paperbark Cherry, Tibetan Cherry Prunus serrulata Japanese Flowering Cherry Prunus snow Prunus snow Prunus subcordata Klamath Plum, Sierra Plum, Pacific Plum Prunus subhirtella Higan Cherry Prunus subhirtella var. autumnalis Autumn Flowering Higan Cherry Prunus tai Prunus tai Prunus virginiana Prunus virginiana Prunus virginiana var. demissa Western Chokecherry Prunus virginiana var. virginiana Common Chokecherry, Eastern Chokecherry Prunus yedoensis Yoshino Cherry, Somei-yoshino Cherry, Tokyo Cherry