A practical guide to growing mushrooms in IndiaA joint educational initiative by MushroomWale & DMR Solan ↗
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Topics

Crop health / observation guide

Diagnose a Mushroom Crop Problem

Describe the crop and what changed. Compare explanations and prepare a useful record for your adviser—without guessing a disease from a picture.

Read this in the full guide: Investigate a crop problem without losing the evidence →

Explainable decision support

Describe what you see.

Choose the crop and observation first. Compare possible explanations, then record the evidence a crop adviser would need.

Start with what you can see. You do not need a meter to record an observation; leave unknown readings blank.

Question 1: identify the cultivated crop
What are you seeing?

Choose the crop above to begin. No crop problem is selected for you.

Choose your crop and observation

Possible causes to investigate

The number of completed fields does not establish diagnostic confidence. These are working hypotheses, not confirmed causes. The list uses only your crop and symptom selection. Written notes and readings are retained for review; they do not change or rank these causes.

AI teaching scene showing a grower recording the bed, nearby conditions and close-up photographs; not a disease example.
AI teaching illustration · How to document a problem, not how to identify a disease.

Begin with the crop, not a disease name.

No causes are shown until you choose a cultivated mushroom and an observation. This tool does not analyse uploaded photographs.

See how to photograph the problem →Compare the published Button mushroom photographs →

Diagnostic photo set

Capture technical evidence, not a beauty shot.

  1. Whole bed
  2. Affected area
  3. Close-up
  4. Side view
  5. Healthy comparison
  6. Room context

Image assistance is not active. Keep the photographs on your device and share them directly with a qualified adviser. This page does not upload or analyse them.

Button mushroom · Photo reference and management

See the symptom. Check the cause. Act carefully.

Real research photographs with practical, nonchemical first steps. These examples come from published studies, not MushroomWale farms. Resemblance is a clue, not confirmation of disease in your crop.

  1. 01Observe the crop and record the pattern
  2. 02Limit transfer to clean areas
  3. 03Check the diagnosis and follow a response plan
  4. 04Review the next crop for recurrence
Research reference: a malformed Button mushroom with a split stem, captioned as dry bubble in Gea et al. Figure 1a.
Published research photographPanel 1a, lower photograph. Display cropped; no symptom retouching.Gea, Navarro, Santos, Diánez & Carrasco (2021), Figure 1, Microorganisms 9:585CC BY 4.0The publication identifies crop symptoms in the lower row; the upper row contains cultures. Only the crop photograph is shown here.

Dry bubble

Look for malformed mushrooms, split stems or wart-like growths. Later infection can appear as grey-brown cap spots; the appearance changes with crop stage.

What to do first
Mark the patch and do not pick out or handle dry bubbles. Avoid splashing exposed affected tissue. Have a trained supervisor contain the patch using the linked extension procedure.
Reduce the chance of recurrence
Keep casing, casing equipment and clean tools protected from contaminated dust and debris. Check fly control and movement of people between rooms.
What can look similar?
Wet bubble and other causes of spotting can look similar. A photograph cannot identify the pathogen; ask for specialist examination when the pattern is unclear.
What to record
Record when the first affected mushrooms appeared, their bed positions, watering history and whether new spots developed nearby.
Read the full condition guide →AHDB: dry bubble recognition and containment ↗Undated archived guidance; accessed 17 September 2026. International guidance: adapt with a qualified adviser for your Indian farm.
Research reference: a large malformed white mass with amber droplets, captioned as wet bubble in Gea et al. Figure 1c.
Published research photographPanel 1c, lower photograph. Display cropped; no symptom retouching.Gea, Navarro, Santos, Diánez & Carrasco (2021), Figure 1, Microorganisms 9:585CC BY 4.0The publication identifies crop symptoms in the lower row; the upper row contains cultures. Only the crop photograph is shown here.

Wet bubble

Irregular swollen tissue, severely distorted mushrooms and amber droplets are useful clues. Decay can develop as affected tissue deteriorates.

What to do first
Mark the area and avoid splashing it. Once wet bubble is identified, trained staff can carefully enclose local affected material in a disposable bag, seal it and follow the farm's containment and disposal procedure.
Reduce the chance of recurrence
Protect casing and water supplies from soil, dust and crop debris. Keep clean equipment away from contaminated floors and spent material.
What can look similar?
Do not apply this removal approach to an unidentified bubble: dry bubble handling differs. Ask a crop-health specialist to distinguish them.
What to record
Record the casing lot, first affected location, water source, spread after watering and photographs before intervention.
Read the full condition guide →AHDB: wet bubble recognition and containment ↗Undated archived guidance; accessed 17 September 2026. International guidance: adapt with a qualified adviser for your Indian farm.
Research reference: white cottony growth spreading across mushrooms and casing, captioned as cobweb in Gea et al. Figure 1b.
Published research photographPanel 1b, lower photograph. Display cropped; no symptom retouching.Gea, Navarro, Santos, Diánez & Carrasco (2021), Figure 1, Microorganisms 9:585CC BY 4.0The publication identifies crop symptoms in the lower row; the upper row contains cultures. Only the crop photograph is shown here.

Cobweb disease

Watch for an expanding cottony surface growth across casing and mushrooms. Older growth may become powdery, with spotting or a pinkish tinge.

What to do first
Mark the patch before routine watering. Do not brush, blow or spray exposed growth. Arrange gentle containment by trained staff, following the extension procedure and the room's crop-management plan.
Reduce the chance of recurrence
Inspect before watering, control dust and crop debris, and clean equipment between rooms. Review how air movement and watering could carry material from an affected patch.
What can look similar?
Normal mushroom mycelium and other moulds may look white. Rate of spread, location and examination of samples matter more than colour alone.
What to record
Photograph the same marked area over time. Note nearby spotting, recent watering and which rooms shared tools or staff.
Read the full condition guide →AHDB: cobweb recognition and containment ↗Undated archived guidance; accessed 17 September 2026. International guidance: adapt with a qualified adviser for your Indian farm.
Research reference: green-sporulating growth in a Button mushroom crop, captioned as green mould in Gea et al. Figure 1d.
Published research photographPanel 1d, lower photograph. Display cropped; no symptom retouching.Gea, Navarro, Santos, Diánez & Carrasco (2021), Figure 1, Microorganisms 9:585CC BY 4.0The publication identifies crop symptoms in the lower row; the upper row contains cultures. Only the crop photograph is shown here.

Green mould observation

A dense white patch may later become green as spores form. Poor cropping can accompany the affected area, but colour does not identify a mould species.

What to do first
Flag the batch and restrict movement of affected material, tools and staff into clean areas. Do not shake bags or brush spores off beds. Obtain advice on containment and whether the crop should continue.
Reduce the chance of recurrence
Review compost preparation, spawning hygiene and batch history together. Check cleaning and the validated end-of-crop treatment before loading another crop.
What can look similar?
Several moulds can appear green. Laboratory identification may be needed to establish whether Trichoderma is involved and which species it is.
What to record
Record whether growth is in compost, casing or surface debris, which input lots are shared, and whether other rooms from the same batch are affected.
Read the full condition guide →Penn State Extension: green mold of mushrooms ↗Updated 23 December 2025; accessed 17 September 2026. International guidance: adapt with a qualified adviser for your Indian farm.
Research reference: brown surface blotching on a naturally affected mature Button mushroom, Huang et al. Figure 1b.
Published research photographPanel 1b, natural symptoms. Display cropped; no symptom retouching.Huang, Huang, Nie & Liu (2024), Figure 1b, Phytopathology Research 6:21CC BY 4.0Panel b shows naturally affected mature Button mushrooms from the study in Guangxi, China, not an Indian farm or an inoculation experiment.

Bacterial blotch

Yellow-brown to dark brown superficial patches may occur on caps, including places where mushrooms touch or surfaces remain wet.

What to do first
Check actual cap wetness after watering and look for condensation. Correct water timing and air distribution with the crop supervisor so surfaces can dry without desiccating the crop.
Reduce the chance of recurrence
Avoid persistent wet surfaces, uncontrolled temperature swings and splash transfer. Clean handling equipment and compare conditions across the room, not only at the wall sensor.
What can look similar?
Bruising, fungal spots and other bacteria can produce browning. The photographed study found more than one bacterial cause; matching a picture is not a species diagnosis.
What to record
Note when spotting appears relative to watering, picking and packing. Record wetness, condensation and affected positions before changing settings.
Read the full condition guide →Penn State Extension: bacterial blotch disease ↗Updated 23 December 2025; accessed 17 September 2026. International guidance: adapt with a qualified adviser for your Indian farm.
Make the observation useful

A useful photo set tells a story.

Take photographs before changing conditions. Do not open suspect bags, brush growth or move affected material through clean work areas to get a better picture.

AI teaching illustration of a grower photographing a mushroom bed, with a notebook, meter and close-up framing example.

AI-generated illustration of documentation—not a diseased crop or diagnostic evidence.

  1. 01

    Whole bed

    Show which rack, shelf and bed are involved. Keep an unaffected area in view where possible.

  2. 02

    Same patch, closer

    Photograph the surface and a side view without disturbing suspect growth. Repeat from the same position.

  3. 03

    Healthy comparison

    Use the same crop, stage and lighting. Differences in crop age can otherwise mislead.

  4. 04

    Room and record

    Add the date, batch, first observation, watering history and readings with locations and units.

Evidence and review

Trace the claim and its limits.

Pathogen biology, dated advisories and current regulatory status are stored separately.

Institutional Reference

ICAR-DMR Technical Bulletin Library

Institutional publication index for disease, farm-design, post-harvest and spent-substrate references.

Open source
Current Advisory

ICAR-DMR Crop Advisory

Dated Indian seasonal crop-health, hygiene and pest observations.

Open source
Institutional Reference

Directorate of Plant Protection, Quarantine and Storage regulatory functions

Indian pesticide registration and regulatory-governance context under the Insecticides Act and Rules.

Open source

Historical management reference: old disease literature may describe treatments that are no longer authorised, labelled or appropriate. It is never an operational instruction here.

Chemical 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

Understand the topic

What you need to know.

Use this page together with the symptom tool above it. The tool helps you narrow possible causes. The Parts below show how to make your observation worth acting on: what to write down, how to read the pattern across the room, how to photograph a problem without spreading it, what an adviser needs from you, and when to stop and call an expert.

Teaching revised 2026-09-24. Source-linked editorial synthesis; this date does not imply independent technical review.

Part 01

Write five facts before you write a disease name

A disease name is a conclusion. A description is a fact, and it stays true even if the name later turns out to be wrong. For anything unusual, write these five facts in plain words.

What: the sign itself. Soft wet lumps with brown liquid on six bags is a useful description; the words wet bubble are only a guess.

Where: room, rack, shelf height, bag or bed number, and the distance from the door and the air inlet.

How many: a count, not some. Count again two days later and write both numbers side by side.

Since when: the date and the crop day, meaning days after spawning or casing.

What changed: watering, ventilation, a power cut, a new compost or casing lot, or a visitor in the previous three days.

The ICAR-DMR manual itself describes problems this way, by what can be seen: wet bubble by a golden brown liquid and a foul smell, bacterial blotch by dark brown spots that are slimy. A record written like this lets an adviser test your crop against those descriptions instead of guessing from a name.

Source: ICAR-DMR manual, 2011

The five facts in every record

  1. WhatThe sign in plain words, not a disease name.
  2. WhereRoom, rack, shelf height, bag number, and distance from the door and inlet.
  3. How manyA count now, and another two days later.
  4. Since whenThe date and the crop day after spawning or casing.
  5. What changedWatering, air, power, new lots or visitors in the previous three days.
Part 02

Read the pattern across the room and over time

Pattern is the shape of a problem across the room; speed is how fast it changes. Put one pattern word in every record, because each word points to a different next check.

  • Uniform: every bag or bed looks the same. Check the climate of the whole room, or a compost or casing lot used everywhere.
  • Spreading: a few bags on the first day and their neighbours a few days later. This is how infections and moving pests behave.
  • Localised: only under a drip, by the door or near the air inlet. Look for a physical cause at that spot.
  • Batch-linked: every bag from one compost or casing lot and none from the others. Compare the lot records.
  • One odd bag: often a filling or spawn fault in that bag alone.
  • Fast: the ICAR-DMR manual warns that dry bubble left uncontrolled can destroy a crop in 2 to 3 weeks, so a count that rises at every check needs action, not waiting.

Source: ICAR-DMR manual, 2011

Part 03

Photograph a problem without spreading it

A photograph helps only if someone who has never seen your farm can find the spot and compare it with healthy crop. Take the pictures before you water, pick or change the room.

Common mistakeSending one close-up of the worst mushroom.

Do this insteadSend a set: a room view from the door, the whole bed or bag with its number, a close view with a coin beside the sign for scale, and a healthy mushroom of the same age under the same light.

Common mistakeBrushing growth off, opening suspect bags or carrying them outside for better light.

Do this insteadPhotograph it where it is. The manual lists hands, tools, clothing and water splash among the ways the bubble diseases and cobweb spread.

Common mistakePhotographing only after the crop has been watered or picked.

Do this insteadPhotograph first and note the time since the last watering. Blotch in the manual depends on how long water stays on the caps.

Common mistakeTaking each day's picture from a new angle.

Do this insteadMark where you stood and repeat the same frames two days later. The change between the two sets is the evidence.

Common mistakeShowing only the outside of a damaged stem.

Do this insteadCut one affected stem lengthwise and photograph the inside. Sciarid and phorid larvae tunnel inside the stem, and a hand lens helps you see them.

Source: ICAR-DMR manual, 2011

A few button mushrooms and pinheads emerging from black casing soil in compost bags, Tamil Nadu (uploaded by a TNAU student); dim and slightly soft.
A close flash photograph of button mushrooms on casing in a bag. On its own, a picture like this shows no rack position, no scale and no healthy comparison, so it cannot show a pattern. Photo: Pavimps, CC BY-SA 4.0. Source
Part 04

Build a record an adviser can act on

Send this record with the photographs, before you buy anything. It lets a KVK scientist or the ICAR-DMR team test causes instead of guessing from a picture.

  1. Crop and batchSpecies and strain, compost and casing lot numbers, and the spawning and casing dates.
  2. Readings where the crop isTemperature and humidity at bed level beside the affected spot and beside a healthy one, with where each reading was taken. A wall sensor alone can hide a difference across the room.
  3. Counts over timeAffected bags or beds now and two days later, and the weekly fly-trap count with the flush number. ICAR-DMR's sciarid action level from the second flush is counted per trap per week.
  4. TimelineEvery change in the previous three days: watering, ventilation, a power cut, a new delivery or a visitor.
  5. What you already didAny removal, cleaning or product used, with the date, so the adviser does not mistake your action for a symptom.
  6. Your questionAsk what evidence would confirm the cause and how to collect and send a sample. Do not ask for a medicine to match a photograph.

Source: ICAR-DMR manual, 2011

Part 05

When to stop and call an expert

The tool above and remote advice are enough when the cause is clearly in the room and correcting it stops the problem. These situations need a person on site or a laboratory.

IfThe number of affected bags rises at every check, or a second room shows the same sign.
ThenContain it and call ICAR-DMR, a KVK or an agricultural university the same day.
IfPinning is late, mushrooms open early, come up in dense clusters or as drumsticks, and you cannot find a room cause.
ThenAsk for a virus investigation. The manual calls die-back symptoms highly variable, and several of them also come from carbon dioxide trouble, so symptoms alone cannot settle it.
IfMycelium thins in patches, the compost surface sinks and flushes come late and poor.
ThenAsk for a nematode test. Nematodes are microscopic and the manual lists no cure during cropping, so the answer mainly changes how you prepare the next crop.
IfA mould appears that you cannot place, or its colour changes as it ages.
ThenKeep it contained and ask a laboratory. Green mould in the manual starts as white growth that looks like mushroom mycelium, so colour on one day is weak evidence.
IfAnyone suggests a chemical treatment.
ThenAsk the adviser to confirm a current label for mushrooms in India for that problem before you buy it.

Sources: ICAR-DMR manual, 2011 · Directorate of Plant Protection, Quarantine and Storage: Directorate of Plant Protection, Quarantine and Storage regulatory functions

Read the evidence

Sources & review.

Editorial update: 2026-08-23. Independent technical review is not recorded for this entry.

  1. ICAR-DMR Technical Bulletin Library ↗

    ICAR-Directorate of Mushroom Research

  2. ICAR-DMR Crop Advisory ↗

    ICAR-Directorate of Mushroom Research · 2026

  3. Directorate of Plant Protection, Quarantine and Storage regulatory functions ↗

    Directorate of Plant Protection, Quarantine and Storage · 2024

Reading a source is not the same as applying its instructions to every farm. Confirm species, strain, crop stage, system, region and publication date. Old chemical recommendations are not current-use instructions.

See something that needs correcting? Tell us →