Witches broom of broom

Witches broom of broom is a serious pathological condition caused by phytoplasmas, which are wall-less bacteria that colonize the plant's vascular system. By disrupting the plant's hormonal balance, the pathogen triggers the uncontrolled growth of dormant buds, resulting in the typical broom-like appearance.

This disease specifically impacts members of the legume family, most notably the common broom (Sarothamnus scoparius). It is a significant concern for nursery owners and gardeners, as it renders the affected shrubs aesthetically ruined and biologically weakened, often leading to premature plant death.

The primary clinical symptoms include the development of numerous thin, stunted, and clustered shoots arising from a single point. These growths are typically accompanied by leaf chlorosis, smaller leaf size, and a complete cessation of flowering, which is the most prominent feature for diagnostic purposes.

Transmission occurs predominantly through sap-sucking insects, such as leafhoppers, which act as vectors. As they feed on infected sap, they acquire the phytoplasma and introduce it into healthy tissues during subsequent feeding events. Human activity, specifically propagation using infected wood, is another common pathway for disease spread.

Management of witches broom relies heavily on sanitation, as there is no chemical cure for infected shrubs. Once identified, plants should be removed immediately to prevent further spread. Preventive strategies focus on insect control within the growing area and strict quarantine of incoming plant materials to ensure they are pathogen-free.