Acremonium Wilt

From Bugwoodwiki

bacterial leaf scorch Photo by Theodor D. Leininger, USDA Forest Service, Bugwood.org Taxonomy Kingdom: Monera Phylum: Proteobacteria Class: Gammaproteobacteria Order: Xanthomonadales Family: Xanthomonadaceae Genus: Xylella Species: fastidiosa Scientific Name Xylella fastidiosa Wells et al., 1987 Common Name Synonyms pecan bacterial leaf scorch; citrus variegated chlorosis

Contents 1 Fungus 2 Injury 3 Control 4 References

Fungus

Initial infections by conidia likely occur through bark wounds made by insects, animals, or storms.

Injury

Brown leaves appear on one to several branches in spring. The disease develops progressively causing twig dieback, defoliation, and pale-yellow, stunted foliar regrowth (fig. 26). Acremonium wilt is favored by hot weather (> 30º C). Wilted sycamores are susceptible to infection by B. rhodina.

Figure 26. - Sycamore tree with Acremonium wilt.

Control

Acremonium wilt is mainly a problem in urban areas of east Texas. It has been controlled experimentally by spraying leaves and trunks with fungicides.

References

Leininger, T.D; Solomon, J.D.; Wilson, A. Dan; Schiff, N.M. 1999. A Guide to Major Insects, Diseases, Air Pollution Injury, and Chemical Injury of Sycamore. Gen. Tech. Rep. SRS-28. Asheville, NC: USDA Forest Service, Southern Research Station. 44 p.