Site Logo
ARS Home About Us Helptop nav spacerContact Us En Espanoltop nav spacer
   return home


glossary symptoms

Welcome to the
Phytoplasma Resource Center
hosted by the
Molecular Plant Pathology Laboratory (MPPL)

Glossary; symptoms

Plants infected by phytoplasmas may exhibit one or more of the following symptoms:

Phyllody - development of leaf-like growths in place of normal flower parts (image 1) (image 2)

Virescence - development of green color in place of normal flower color (image 1)

Witches broom - abnormal, excessive proliferation of axillary shoots resulting in a broom-like growth (image 1)

Yellowing - leaves loose normal green color, becoming yellow (image 1)

Little leaf - development of abnormally small leaves (image 1)

Proliferation - abnormal growth of numerous stems (shoots) (image 1)

Necrosis - death of cells and/or tissues

Dieback - generally refers to death of branches on woody plants, shrubs, trees; typically, young shoots, twigs, and distal portions of branches die progressively toward older plant parts

Stunting - overall reduction of plant height due to shortening of internod

Bunchy top - shortening of internodes at and near the tip of a branch, resulting in bunched growth at the end of the branch

Dr. Robert E. Davis, Research Leader
United States Department of Agriculture Building 004, BARC-West
10300 Baltimore Ave. Beltsville, MD. 20705

Designed and created by Jonathan Shao, shaoj@ba.ars.usda.gov


 Phytoplasma Classification Database
ARS Home | USDA.gov | Site Map | Policies and Links 
FOIA | Accessibility Statement | Privacy Policy | Nondiscrimination Statement | Information Quality | FirstGov | White House