Holly Diseases & Insect Pests
Prepared by Marjan Kluepfel HGIC Horticulture Information Specialist; J. McLeod Scott, HGIC Horticulture Extension Agent; James H. Blake, Extension Plant Pathologist; and Clyde S. Gorsuch, Extension Entomologist, Clemson University. Revised by Joey Williamson, HGIC Horticulture Extension Agent, Clemson University. (New 04/01. Revised 11/09. Images added 11/09.)
HGIC 2055
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Diseases
Black Root Rot: Black root rot is caused by the fungus Thielaviopsis basicola. This fungus primarily affects the root system and reduces plant vigor. Aboveground symptoms may include stunting of terminal growth, shortening of internodes and interveinal chlorosis. Infected roots are dark brown to black, usually starting at the root tips. Plants with extensive root rot damage will usually decline and die during dry periods.
Damaged Japanese holly roots infected with black root rot.
Division of Plant Industry Archive, Florida Department of Agriculture and consumer Services, www.forestryimages.org
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