Citrus tristeza virus

Definition

Citrus tristeza virus (CTV) is a plant pathogenic virus that affects citrus trees, causing severe economic losses. It belongs to the Closteroviridae family and is transmitted by aphids.

5 Must Know Facts For Your Next Test

1. CTV causes several syndromes in citrus plants, including quick decline, stem pitting, and seedling yellows.
2. The virus has a single-stranded positive-sense RNA genome.
3. CTV is primarily spread through infected grafting material and by aphid vectors, particularly the brown citrus aphid (Toxoptera citricida).
4. Infected trees can exhibit symptoms such as leaf yellowing, tree stunting, and reduced fruit quality and yield.
5. Management strategies include using CTV-resistant rootstocks and controlling aphid populations.

Review Questions

• What are the primary transmission methods for Citrus tristeza virus?
• Which family does Citrus tristeza virus belong to?
• Name at least two symptoms of Citrus tristeza virus infection in citrus trees.

Related terms

Closteroviridae: A family of plant viruses known for having long filamentous virions.

Aphid Vector: Insects that transmit plant viruses by feeding on sap.

Positive-Sense RNA Virus: Viruses with genomes that can directly serve as mRNA for protein synthesis.