Yellows

Definition

A group of diseases in plants caused by phloem-colonizing bacteria, phloem-feeding insects, or certain fungal pathogens that lead to yellowing of leaves and stunted growth.

Etymology

From the Old English 'geolu', meaning 'yellow'.

Example

Aphids are vectors for various yellows diseases, transmitting the pathogens to healthy plants.

Related Terms

• Phytoplasma
• Aphid
• Leafhopper
• Chlorosis

Usage Notes

The term 'yellows' is often used in conjunction with specific plants, such as 'aster yellows' or 'peach yellows'.