Nematodes
An evidence-led guide to investigate compost and casing pathways with microscopic confirmation.
From symptom to cause
A first look, not a diagnosis. Source: ICAR-DMR manual and disease bulletin.
| What you see | Likely cause | First step |
|---|---|---|
| Long stems, small caps | CO₂ too high (above about 1,500 ppm) | More fresh air |
| Green patches on compost | Trichoderma; low pH or leftover ammonia | Isolate, remove; check next batch |
| No pins after casing | Room not aired and cooled | 16 to 18 °C, ventilate |
| Brown sunken spots on caps | Bacterial blotch; wet caps | Dry the surface, humidity under 85% |
| White wet lumps | Wet bubble from casing | Salt, remove; steam next casing |
| Small flies | Sciarid or phorid flies | Screens, light traps, hygiene |
Nematodes
Multiple nematode groups
Identification boundary
- Microscopic roundworms requiring appropriate magnification or laboratory examination
- Symptoms and substrate decline are not species identification
Lifecycle and intervention points
Target pathways and life stages instead of spraying indiscriminately.
Direct damage evidence
- Some groups may affect mushroom mycelium
- Others feed on bacteria or fungi and may be indicators rather than the primary cause
Vector potential
- Movement with casing, compost, water, tools or flies may occur depending on group
Only make a vector claim when the organism and pathway are supported.
Exclusion
- Control source materials
- Prevent dirty-water and tool transfer
- Maintain room separation
Pest trend, without a fake threshold
Use the same numbered trap, interval and room context. A trend triggers investigation, not an invented universal action point.
- Day A
- T-01, Demo room, count 3
- Day B
- T-01, Demo room, count 5
- Day C
- T-01, Demo room, count 4
- Day D
- T-01, Demo room, count 8
Integrated management hierarchy
Prevention and verified root-cause correction come before chemical action.
- 1
confirm presence and functional group
- 2
trace source material
- 3
correct water or hygiene pathway
- 4
seek specialist guidance
Quick recognition
Use nematodes to investigate compost and casing pathways with microscopic confirmation. Recognition begins the investigation; it does not confirm a cause.
- Identify the organism or group
- Separate adults from larvae and damage
- Use repeated trap counts
- Map entry and breeding routes
What to record
Capture crop stage, crop day, room, rack, layer, pattern, first observation, progression, compost and casing batches, watering, chemistry, pests and timestamped environmental readings.
Could it be something else?
Compare visual appearance with spatial pattern, progression, environmental history, process history and missing expected signs. Colour or one photograph is weak evidence.
Evidence still needed
State the unanswered questions and next measurement. Useful evidence can be visual, environmental, spatial, temporal, microscopic, laboratory, molecular, trap-based or process-history based.
Immediate safe direction
Document the affected area, avoid unnecessary disturbance or cross-room movement, isolate suspect tools, inspect adjacent areas and preserve representative evidence. Do not spray automatically.
Root-cause review
Trace the visible problem through water, evaporation, airflow, sensor placement, compost, casing, staff movement, flies, tools or room design where evidence supports the connection.
Chemical and regulatory boundary
Historical management literature is separated from current practice. No crop-protection dose is published unless the exact product, formulation, mushroom crop label, target, method, harvest interval, worker-safety information and current Indian status are verified.
When remote guidance is inadequate
Seek technical inspection or laboratory support for rapid unexplained loss, repeated outbreaks, suspected virus, unknown mould, severe pests, chemical injury, multiple affected rooms or unresolved contradictions.
Trace the claim and its limits.
Pathogen biology, dated advisories and current regulatory status are stored separately.
Diseases and Competitor Moulds of Mushrooms and their Management
Indian mushroom disease descriptions, symptoms, epidemiology, historical taxonomy and competitor-mould records.
Open sourceMushroom Pests and Diseases
Current extension descriptions of Button Mushroom pests, diseases, hygiene and integrated management.
Open sourceIntegrated disease and pest control in Irish mushroom tunnels
Fly, mite and nematode group distinctions, life cycles, monitoring and hygiene pathways.
Open sourceDirectorate of Plant Protection, Quarantine and Storage regulatory functions
Indian pesticide registration and regulatory-governance context under the Insecticides Act and Rules.
Open sourceChemical governance is a publication gate.
No operational pesticide, fungicide, insecticide, disinfectant or fumigant dose is published. Historical references are not current labels.
- Current operational dose
- Not published
- Mushroom crop label
- Not established by this record
- Review status
- Regulatory review required