Aster yellows is a chronic, systemic plant disease caused by a bacterium-like organism called a phytoplasma. The aster yellows phytoplasma (AYP) affects 300 species in 38 families of broad-leaf herbaceous plants, primarily in the aster family, as well as important cereal crops such as wheat and barley.

a microscopic, bacteria-like organism that lacks a cell wall and therefore appears filamentous

Any very small bacteria that lack a cell wall and are obligate parasites of plant cells. They cause many plant diseases and are tranmitted by vectors such as sucking insects like leafhoppers. Similar [..]

A microscopic, bacteria-like organism that lacks a cell wall. Previously called mycoplasma.

A genus of minute Bacteria in the Family Acholeplasmataceae that inhabit Phloem sieve Elements of infected Plants and cause symptoms such as yellowing, phyllody, and witches' Brooms. Organisms la [..]

A genus of minute bacteria in the family ACHOLEPLASMATACEAE that inhabit phloem sieve elements of infected PLANTS and cause symptoms such as yellowing, phyllody, and witches' brooms. Organisms la [..]

Microorganisms found in phloem tissue that resemble mycoplasmas in all respects except that they cannot yet be grown on artificial nutrient media. Formerly known as mycoplasmalike organism (MLO).

A microscopic, bacteria-like organism that lacks a cell wall. Previously called mycoplasma.