Milky mushrooms

Use a validated preparation and inoculation procedure for your substrate. Keep treatment, cooling and spawning records separate enough to trace a failed batch. When comparing colonisation, observe bags of the same age and material batch. A white patch at one edge does not establish that the whole substrate is ready for casing.

Before opening the bags, check development and arrange the clean work area, casing material and labels. Record abnormalities before disturbing the crop. Do not use an arbitrary number of days as the sole release rule; strain, substrate and actual conditions influence development. Escalate stalled or abnormal bags rather than casing over a problem to keep to the schedule.

Casing is a distinct surface layer, with its own preparation, physical structure and hygiene requirements. Keep its source, treatment and application records. Apply using the crop-specific method taught for that material. Uneven depth or unintended compaction changes the surface environment and makes later comparisons difficult.

Room relative humidity and casing water content are not interchangeable. Examine the layer and the developing crop, not only the controller. Record watering timing, method and affected areas. If only part of a bed dries, compare distribution, air exposure and layer uniformity before adding more water everywhere. Avoid treating standing water as evidence of good moisture management.

Mark representative bags and compare where pins begin, how they develop and where losses occur. Photograph the same locations with a date and scale. When development is uneven, compare casing lot and application, watering, light and local air conditions. Several factors can produce similar visible symptoms, so preserve the observations and seek help with a specific question.

Harvest to the agreed buyer specification and keep grade weights separate. Review each batch using saleable kilograms, rejects, unsold quantity and payment records. If a new casing material is trialled, change it in a small labelled comparison under competent guidance while keeping other practices consistent. An uncontrolled whole-room change cannot show whether the material or another change caused the result.

Label two small comparable groups using the existing and proposed casing method. Record both application details and environmental differences. Compare crop development, losses, labour and buyer acceptance. This is a learning trial, not proof that the new material is generally superior.

Milky mushroom is Calocybe indica, called dudhiya because the young mushroom is milk white. ICAR-DMR says one milky crop can be taken in almost all the plains of the country, leaving out the hills, wherever temperature stays between 25 and 40 C for some months.

That sentence is the whole species argument. White button fruits at 15 to 17 C air, which on a plain in April means a refrigeration plant. Milky fruits at 30 to 35 C and, in DMR's words, keeps producing even at 30 to 40 C. It matches weather you already have.

The DMR seasonal folder gives months. On the north Indian plains a milky crop runs February to April and again July to September. In the mid hills it runs April to June. The high hills are not milky country.

The same folder places whole regions. In the coastal states oyster, paddy straw and milky grow in the natural climate all year, and central and western India can grow milky all year.

Read your district into that. A summer maximum near 35 C sits inside the band. Above 40 C for weeks you need shade, wet walls and early morning work.

Here the sources disagree, and you should know it before fixing a room temperature.

The DMR Hindi folder holds spawned bags in a dark room at 25 to 35 C with 80 to 90 percent humidity. TNAU Coimbatore specifies 22 to 25 C and 85 to 90 percent for the same stage. DMR's own species table gives 25 to 30 C.

Treat the wide DMR band as what the fungus tolerates and the narrow TNAU band as what it prefers. Note what catches button growers: in milky the fruiting temperature is higher than the spawn run temperature. In most cultivated mushrooms it is the other way round.

A milky crop is a chain of waits: 15 to 20 days of spawn run, 10 to 12 days of case run, then pinheads 3 to 5 days after mycelium reaches the casing top.

You need a dark room for the run and a lit room for cropping, clean chopped straw, a drum for hot water treatment, and casing soil prepared a week ahead. ICAR-DMR reports a biological efficiency near 100 percent, about one kilogram of fresh mushroom per kilogram of dry straw.

The last question is the buyer. Shelf life is 3 to 4 days without a cold chain.

ICAR-DMR lists wheat straw, paddy straw, sorghum, pearl millet and maize stalks and sugarcane bagasse as milky substrates. Cereal straw is what most growers use.

Condition matters more than choice. DMR is blunt: the material must be new, dry and not soaked by rain. Straw stacked through a monsoon already carries moulds, and pasteurisation kills only what it reaches.

Chop the straw. The 2011 manual works with pieces of 2 to 4 cm, which pack evenly and hold water without becoming a wet mat.

• New season straw, stored under cover and dry to the hand.

Soaking comes first. The farmer folder keeps chaffed straw in gunny bags under clean water for at least 6 hours; the 2011 manual gives 8 to 16 hours. The straw must be wet through, not wet outside.

Then kill the competitors. The folder method is hot water: the filled bag goes into boiling water for 40 minutes, and the water must keep boiling the whole time. The manual states the same 40 minutes at 80 to 90 C. On a larger unit, steam raises the substrate to 65 C for 5 to 6 hours.

DMR also describes chemical steeping. It uses fungicide and formalin, so check current label approval and state rules first.

Drain the treated straw on a clean floor and let it cool to hand temperature. Target moisture is 65 to 70 percent.

DMR gives the field test in plain words: press a handful hard. If no water runs out and your palm is only slightly damp, the moisture is right. If water drips, the bag will sour and mycelium will not run.

Do not spread hot straw on bare earth. The folder washes and disinfects the cooling floor first. Work on a swept, washed surface with clean hands, and cover the straw if the yard is dusty.

Milky takes a heavy dose: 4 to 5 percent of the wet substrate weight, which is 40 to 50 g of spawn per kilogram of wet straw. Folder and manual agree here.

The folder fills a polythene bag about 15 to 16 inch wide and 20 to 21 inch high with 4 to 5 kg of treated substrate, spreading spawn in layers 3 to 4 inch apart. TNAU uses a 60 by 30 cm bag with five straw layers.

Then leave them alone. Dark room, 15 to 20 days, bags closed. The manual says about 20 days to full colonisation, after which the bag is ready for casing.

Casing is a layer of treated soil spread over colonised substrate. The 2011 manual states its three jobs plainly: physical support, moisture, and a path for gases to escape from the substrate below.

For milky it is not optional. Without casing the mycelium keeps growing sideways and never switches to making fruit bodies. The stage that follows is the case run, when mycelium climbs into the soil layer.

Think of casing as a change of instruction, not as feeding. It carries almost no nutrition. It changes what the fungus is being asked to do.

The DMR Hindi folder mixes three quarters loam soil with one quarter sand by volume, then adds chalk powder at 10 percent of the mixture weight. The 2011 manual prefers soil 75 percent plus sand 25 percent, and accepts coir pith with soil or farmyard manure with soil.

The chalk is not decoration. DMR sets milky casing pH at 7.8 to 7.9, adjusted with chalk. That is more alkaline than the 7.0 to 7.5 the same institute sets for button casing, so soil from the button shed is the wrong soil here.

Prepare the mixture about a week ahead, not on the morning of casing.

Casing soil is the main doorway for wet bubble disease. DMR records that its spores survive up to three years in casing soil, so last season's soil is a risk, not a saving.

The heat route is one every grower can check: steam treatment of casing soil at 54.4 C for 15 minutes. TNAU steams casing soil in a pressure cooker for 45 minutes. The manual also allows autoclaving at 15 psi for one hour.

DMR's folder describes a chemical route using formalin and a fungicide under a polythene sheet. Approvals change, so confirm current label approval and state rules before using any chemical.

Three Indian documents give three depths. The DMR farmer folder says 2 to 3 cm. The 2011 manual says 3 to 4 cm. TNAU says 1 cm, pressed gently.

Do not average them. Pick one, keep it the same across every bag, and write it down, because depth is one of the few things you fully control. An uneven layer gives early pins in the thin patches and nothing in the thick ones.

After casing, hold 30 to 35 C and 80 to 90 percent humidity. DMR reports 10 to 12 days for mycelium to spread through the casing, and pinheads 3 to 5 days after it reaches the top.

Once mycelium reaches the casing top, DMR reports pinheads within 3 to 5 days and about a week more to full size. TNAU, working in Tamil Nadu, reports buttons about 10 days after casing and harvest 7 days later.

Both are published Indian figures. What matters is your own count. If expected development is absent, investigate strain and stage, colonisation, casing preparation and moisture, room conditions and crop health. Timing alone does not identify the cause.

So write the casing date on the bag itself. Without that date the first pinning is a surprise you cannot repeat.

Milky mushroom fruits in light. The 2011 manual says light should be given for the maximum duration through the whole cropping period, but it gives no lux figure and no photoperiod.

TNAU is the only Indian source read here that puts a number on it: 2500 to 3000 lux for button formation, with cased beds kept inside a blue polythene tent. That is bright, roughly a shaded verandah, far more than a dim store room.

In a dark room pins either fail to form or come up on long thin stalks. Diffused window light or tube lights on a timer both work. Direct afternoon sun on the bags does not.

The 2011 manual asks for a minimum of 3 to 4 air changes per hour once fruiting starts. That is far less than a button room needs, but it is not zero, and a sealed room gives long stalks with small caps.

Hold 30 to 35 C. The folder keeps humidity at 80 to 90 percent; the manual's water management section narrows it to 80 to 85 percent during cropping.

Water the casing surface, not the mushrooms. Fine mist on walls and floor lifts humidity without leaving a film on caps, and a wet cap in warm air is where bacterial spotting starts.

DMR's two documents give two picking sizes. The farmer folder calls the cap mature at 5 to 6 cm; the 2011 manual harvests at 7 to 8 cm diameter. Pick by twisting with thumb and finger, then trim the soiled stem base with a clean knife.

ICAR-DMR reports a biological efficiency close to 100 percent, about one kilogram of fresh mushroom per kilogram of dry straw. That is a reported figure, not a promise.

Pack into polythene with at least four holes of 4 to 5 mm. Shelf life is 3 to 4 days without loss of colour, so plan the sale before the pick.