Cannabis root/crown, foliar, floral, and systemic disease patterns plus integrated diagnostics; explicitly notes that root browning can arise from pathogens or waterlogging and that confirmation matters.
Visual lesson 08
Root & crown: biotic vs abiotic clues
Compare discoloration, lesions, root loss, wilting, stunting, odor, saturation history, oxygen conditions, and pathogen evidence so root or crown decline is not assigned to disease or overwatering from appearance alone.
System study map
Root & crown: biotic vs abiotic clues
Root-and-crown biotic versus abiotic differential matrixStart with the highlighted plant system as the anatomical context. Then compare the lesson observations with the evidence sources and knowledge check below so structure, process, and whole-plant consequences stay connected.- Plant system
- Diagnostic Overlay
- Lesson focus
- Root-and-crown biotic versus abiotic differential matrix
- Study mode
- Whole-plant context
Knowledge check
PracticeCan you explain what the visual is showing?
Why is brown or declining Cannabis root tissue not enough by itself to diagnose a root pathogen?
Track this lesson
Mark the lesson complete when you are comfortable with the visual, observations, and system context.
Evidence & further reading
Sources connected to this lesson
These references support specific biological, diagnostic, environmental, or process concepts used in this lesson. They are not a substitute for crop-specific testing or local regulatory guidance.Cannabis photosynthetic and stomatal responses to water deficit, genotype-dependent drought response, biomass partitioning, and physiological interpretation under measured conditions.
Cannabis greenhouse disease diagnosis and integrated management, including powdery mildew, Botrytis, root disease, HLVd, sanitation, irrigation, airflow, and post-harvest microbial risk.
Cannabis leaf morphogenesis, phyllotaxy, plant architecture, reproductive transition, inflorescence development, trichome development, and senescence across a complete life cycle.
System context