Cannabis nutrient-deficiency symptom onset and progression with upper/lower canopy tissue analysis; shows that visual onset and foliar elemental analysis do not always align simply.
Visual lesson 09
Senescence vs disorder
Separate expected age- and flowering-associated tissue senescence from atypical nutrient, root-zone, pathogen, or environmental decline by using developmental stage, distribution, rate of change, and healthy comparison plants.
System study map
Senescence vs disorder
Normal senescence versus disorder progression comparisonStart 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
- Normal senescence versus disorder progression comparison
- Study mode
- Whole-plant context
Knowledge check
PracticeCan you explain what the visual is showing?
What is the best way to separate expected senescence from a developing disorder?
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 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.
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