Overview of Plant Diseases

What has been documented in cannabis so far is mostly viral, plus one viroid: HLVd, the best-studied case of them all. Each entry covers symptoms, how the pathogen travels, what testing is available, and which measures actually pay off in a home grow.

Nutrient deficiencies are not listed here. They have their own category under plant nutrition, and the split matters in practice: pale leaves and stunted growth look much the same whether a nutrient is missing or a virus is at work, and telling them apart decides what you do next.

  • Cannabis Viruses

    How hobby growers can identify and prevent viral infections in cannabis – symptoms, tests & protection at a glance.

  • Viruses and Viroids

  • Viroids

  • Hop latent viroid (HLVd)

    HLVd is the best-documented pathogen in cannabis cultivation – a viroid, not a virus. Symptoms, host range, transmission (including seeds and pollen), diagnostics, and management.

  • Viruses That Cause Damage

  • Cucumber Mosaic Virus (CMV)

    Early detection of Cucumber Mosaic Virus (CMV) in cannabis: symptoms, transmission, and effective prevention and management strategies.

  • Alfalfa mosaic virus (AMV)

    How does Alfalfa mosaic virus (AMV) affect cannabis? Learn more about symptoms, transmission routes, prevention, and the current implications for hobby growers.

  • Arabis mosaic virus (ArMV)

    How Arabis mosaic virus (ArMV) infects cannabis, what symptoms appear, and what hobby growers can do to prevent its spread – explained in detail with sources.

  • Potato virus Y (PVY)

    Potato virus Y (PVY) causes mild, often overlooked symptoms in cannabis. Learn about transmission routes, diagnostics and preventive measures – especially for home growers.

  • Beet curly top virus (BCTV)

    Beet curly top virus (BCTV) causes serious damage to outdoor-grown cannabis. Learn about symptoms, leafhopper transmission, and effective protection strategies for home growers.

  • Lettuce Chlorosis Virus (LCV)

    Lettuce chlorosis virus (LCV) is an emerging threat to cannabis. Learn about symptoms, transmission routes, diagnostics, and prevention—especially for hobby growers.

  • Tomato spotted wilt virus (TSWV)

    Tomato spotted wilt virus (TSWV) infects numerous plant species and poses a risk to cannabis. Learn all about symptoms, thrips transmission, and effective protective strategies for home growers.

  • Viruses Without Documented Damage

  • Tobacco Mosaic Virus (TMV)

    What does a TMV infection mean for cannabis? Learn how Tobacco Mosaic Virus (TMV) spreads, what symptoms might appear, and how hobby growers can protect their plants.

  • Cannabis Cryptic Virus (CanCV)

    Cannabis Cryptic Virus (CanCV) is widespread but asymptomatic. What hobby growers should know about the distribution, detection, and significance of this mysterious virus.

  • Cannabis Mitovirus 1 (CasaMV1)

    Cannabis Mitovirus 1 (CasaMV1) is an unusual virus found in hemp mitochondria. Learn what it is, how it’s inherited, and why it poses no threat to hobby growers.

  • Fungal Diseases

  • Grey Mould

    Grey mould caused by Botrytis cinerea rots ripe cannabis buds from the inside when water condenses in the dense tissue.