Cucurbit yellow vine disease

Definition

A lethal vascular disease of cucurbit crops (cucumbers, melons, squash, pumpkins) caused by the bacterium Serratia marcescens, transmitted primarily by the squash bug Anasa tristis. The disease produces progressive yellowing and collapse of vines, often with a distinctive orange discoloration of vascular tissues. The pathogen persists in the squash bug's digestive tract and is introduced during feeding; nymphs and adults both transmit, with no transovarial passage. Management relies heavily on vector control, as no resistant cultivars are available.

Etymology

From 'cucurbit' (the gourd family Cucurbitaceae) + 'yellow vine' (diagnostic symptom) + 'disease'.

Example

In Oklahoma pumpkin fields, heavy squash bug infestations in early summer often presage cucurbit yellow vine disease outbreaks by mid-July, with vines collapsing two to three weeks after initial yellowing of leaf margins.

Synonyms

• CYVD

Related Terms

• Squash bug
• Anasa tristis
• Serratia marcescens
• vector-borne disease
• phloem-limited pathogen
• cucurbit pest complex
• vascular wilt

Usage Notes

Distinguished from other cucurbit yellowing disorders (such as those caused by cucurbit aphid-borne yellows virus or fusarium wilt) by the orange vascular staining and association with squash bug presence. The disease emerged as a major economic problem in the southern and central United States in the 1980s–1990s. Some literature uses 'cucurbit yellow vine' without 'disease', but the full phrase is preferred in formal contexts.