Fungiculture

Fungiculture is the cultivation of fungi such as mushrooms. Cultivating fungi can yield foods (which include mostly mushrooms), medicine, construction materials and other products. A mushroom farm is involved in the business of growing fungi.

The word is also commonly used to refer to the practice of cultivation of fungi by animals such as leafcutter ants, termites, ambrosia beetles, and marsh periwinkles.

Overview

Mushrooms are fungi and require different conditions than plants for optimal growth. Plants develop through photosynthesis, a process that converts atmospheric carbon dioxide into carbohydrates, especially cellulose. While sunlight provides an energy source for plants, mushrooms derive all of their energy and growth materials from their growth medium, through biochemical decomposition processes. This does not mean that light is an irrelevant requirement, since some fungi use light as a signal for fruiting.[1][2] However, all the materials for growth must already be present in the growth medium. Mushrooms grow well at relative humidity levels of around 95–100%, and substrate moisture levels of 50 to 75%.[1]

Instead of seeds, mushrooms reproduce through spores. Spores can be contaminated with airborne microorganisms, which will interfere with mushroom growth and prevent a healthy crop.

Mycelium, or actively growing mushroom culture, is placed on a substrate—usually sterilized grains such as rye or millet—and induced to grow into those grains. This is called inoculation. Inoculated grains (or plugs) are referred to as spawn. Spores are another inoculation option, but are less developed than established mycelium. Since they are also contaminated easily, they are only manipulated in laboratory conditions with a laminar flow cabinet.

Techniques

All mushroom growing techniques require the correct combination of humidity, temperature, substrate (growth medium) and inoculum (spawn or starter culture). Wild harvests, outdoor log inoculation and indoor trays all provide these elements.

Outdoor logs

Cultivated shiitake mushrooms

Mushrooms can be grown on logs placed outdoors in stacks or piles, as has been done for hundreds of years.[3] Sterilization is not performed in this method. Since production may be unpredictable and seasonal, less than 5% of commercially sold mushrooms are produced this way.[4] Here, tree logs are inoculated with spawn, then allowed to grow as they would in wild conditions. Fruiting, or pinning, is triggered by seasonal changes, or by briefly soaking the logs in cool water.[3] Shiitake and oyster mushrooms have traditionally been produced using the outdoor log technique, although controlled techniques such as indoor tray growing or artificial logs made of compressed substrate have been substituted.[4][5][6]

Shiitake mushrooms grown under a forested canopy are considered non-timber forest products.[7] In the Northeastern United States, shiitake mushrooms can be cultivated on a variety of hardwood logs including oak, American beech, sugar maple and hophornbeam. Softwood should not be used to cultivate shiitake mushrooms as the resin of softwoods will oftentimes inhibit the growth of the shiitake mushroom making it impractical as a growing substrate.[8]

In order to produce shiitake mushrooms, 1 metre (3-foot) hardwood logs with a diameter ranging between 10–15 cm (4–6 in) are inoculated with the mycelium of the shiitake fungus. Inoculation is completed by drilling holes in hardwood logs, filling the holes with cultured shiitake mycelium or inoculum, and then sealing the filled holes with hot wax. After inoculation, the logs are placed under the closed canopy of a coniferous stand and are left to incubate for 12 to 15 months. Once incubation is complete, the logs are soaked in water for 24 hours. 7 to 10 days after soaking, shiitake mushrooms will begin to fruit and can be harvested once fully ripe.[9]

Indoor trays

Indoor mushroom cultivation as a commercial crop was first developed in caves in France. The caves provided a stable environment (temperature, humidity) all year round. The technology for a controlled growth medium and fungal spawn was brought to the UK in the late 1800s in caves created by quarrying near areas such as Bath, Somerset.[10] Growing indoors provides the ability to control light, temperature and humidity while excluding contaminants and pests. This allows consistent production, regulated by spawning cycles.[11] By the mid-twentieth century this was typically accomplished in windowless, purpose-built buildings, for large-scale commercial production.

Indoor tray growing is the most common commercial technique, followed by containerized growing. The tray technique provides the advantages of scalability and easier harvesting.

There are a series of stages in mushroom farming of the most widely used commercial species Agaricus bisporus. These are composting, fertilizing, spawning, casing, pinning, and cropping."[12][13]

Six phases of mushroom cultivation

Phase Time span Temperature Process(procedure)
1. Phase I composting 6–14 days[12] Regulate water and NH3 content through microbial action.

Add fertilizer / additives

2. Phase II composting or pasteurization 7–18 days via composting method, ~2 hours for pasteurization (heat sterilization)[13] Reduce number of potentially harmful microbes through further composting, or apply heat sterilization.

Remove unwanted NH3.

3. Spawning and growth 14–21 days[13] 24 to 27 °C (75 to 80 °F); must be above 23 °C (74 °F); for rapid growth.[12]

Must be below 27 to 29 °C (80 to 85 °F) to avoid damaging mycelia[13]

Add starter culture.

Allow mycelium to grow through substrate and form a colony.

Depends on substrate dimensions and composition.

Finished when mycelium has propagated through entire substrate layer

4. Casing 13–20 days Promote the formation of primordia, or mushroom pins.

Add a top covering or dressing to the colonized substrate.

Fertilizing with nitrogen increases yields.

Induces pinning

5. Pinning 18–21 days[12] Earliest formation of recognizable mushrooms from mycelium.

Adjusting temperature, humidity and CO2 will also affect the number of pins, and mushroom size

6. Cropping Repeated over 7- to 10-day cycles[13] Harvest

Complete sterilization is not required or performed during composting. In most cases, a pasteurization step is included to allow some beneficial microorganisms to remain in the growth substrate.[12]

Specific time spans and temperatures required during stages 3–6 will vary respective to species and variety. Substrate composition and the geometry of growth substrate will also affect the ideal times and temperatures.

Pinning is the trickiest part for a mushroom grower, since a combination of carbon dioxide (CO2) concentration, temperature, light, and humidity triggers mushrooms towards fruiting.[1][2][12] Up until the point when rhizomorphs or mushroom "pins" appear, the mycelium is an amorphous mass spread throughout the growth substrate, unrecognizable as a mushroom.

Carbon dioxide concentration becomes elevated during the vegetative growth phase, when mycelium is sealed in a gas-resistant plastic barrier or bag which traps gases produced by the growing mycelium. To induce pinning, this barrier is opened or ruptured. CO2 concentration then decreases from about 0.08% to 0.04%, the ambient atmospheric level.[12]

Indoor oyster mushroom farming

A merchant selling oyster mushrooms grown indoors.

Oyster mushroom farming is rapidly expanding around many parts of the world. Increased consciousness of its nutritional value and increased market demand is making mushroom cultivation one of the most sought businesses among the farming communities. Oyster mushroom is grown in substrate that comprises sterilized wheat, paddy straw and even used coffee grounds[14] while it does not require much space compared to other crops. Its per unit production and profit extracted is comparatively higher than other crops.[15] Oyster mushrooms can also be grown indoors from kits, most commonly in the form of a box containing growing medium with spores.[16][17]

Substrates

Mushroom production converts the raw natural ingredients into mushroom tissue, most notably the carbohydrate chitin.[1]

An ideal substrate will contain enough nitrogen and carbohydrate for rapid mushroom growth. Common bulk substrates include several of the following ingredients:[11][13]

Mushrooms metabolize complex carbohydrates in their substrate into glucose, which is then transported through the mycelium as needed for growth and energy. While it is used as a main energy source, its concentration in the growth medium should not exceed 2%. For ideal fruiting, closer to 1% is ideal.[1]

Pests and diseases

Parasitic insects, bacteria and other fungi all pose risks to indoor production. Sciarid or phorid flies may lay eggs in the growth medium, which hatch into maggots and damage developing mushrooms during all growth stages. Bacterial blotch caused by Pseudomonas bacteria or patches of Trichoderma green mold also pose a risk during the fruiting stage. Pesticides and sanitizing agents are available to use against these infestations.[11][22] Biological controls for sciarid and phorid flies have also been proposed.[23]

Trichoderma green mold can affect mushroom production, for example in the mid-1990s in Pennsylvania leading to significant crop losses. The contaminating fungus originated from poor hygiene by workers and poorly prepared growth substrates.[24]

Mites in the genus Histiostoma have been found in mushroom farms. Histiostoma gracilipes feeds on mushrooms directly, while H. heinemanni is suspected to spread diseases.[25][26]

Commercially cultivated fungi

Home cultivated shiitake developing over approximately 24 hours.
Harvesting Pleurotus ostreatus cultivated using spawns embedded in sawdust mixture placed in plastic containers
Details of the gill structure of the edible oyster mushroom Pleurotus ostreatus.[27]

Production regions in North America

Pennsylvania is the top-producing mushroom state in the United States, and celebrates September as "Mushroom Month".[28]

The borough of Kennett Square is a historical and present leader in mushroom production. It currently leads production of Agaricus-type mushrooms,[29] followed by California, Florida and Michigan.[30]

Other mushroom-producing states:[31]

  • East: Connecticut, Delaware, Florida, Maryland, New York, Pennsylvania, Tennessee, Maine, and Vermont
  • Central: Illinois, Oklahoma, Texas, and Wisconsin
  • West: California, Colorado, Montana, Oregon, Utah and Washington

Vancouver, British Columbia has a significant number of producers  about 60 as of 1998  mostly located in the lower Fraser Valley.[32]


Production in Europe

Oyster mushroom cultivation has taken off in Europe as of late. Many entrepreneurs nowadays find it as a quite profitable business, a start-up with a small investment and good profit. Italy with 785,000 tonnes and Netherlands with 307,000 tonnes are between the top ten mushroom producing countries in the world. The world's biggest producer of mushroom spawn[33] is also situated in France.

According to a research carried out on Production and Marketing of Mushrooms: Global and National Scenario[34] Poland, Netherlands, Belgium, Lithuania are the major exporting mushrooms countries in Europe and countries like UK, Germany, France, Russia are considered to be the major importing countries.

Education and training

Oyster mushroom cultivation is a sustainable business where different natural resources can be used as a substrate. The number of people becoming interested in this field is rapidly increasing. The possibility of creating a viable business in urban environments by using coffee grounds is appealing for many entrepreneurs.

Since mushroom cultivation is not a subject available at school, most urban farmers learned it by doing. The time to master mushroom cultivation is time consuming and costly in missed revenue. For this reason there are numerous companies in Europe specialized in mushroom cultivation that are offering training for entrepreneurs and organizing events to build community and share knowledge. They also show the potential positive impact of this business on the environment.[35][36]

Courses about mushroom cultivation can be attended in many countries around Europe. There is education available for growing mushrooms on coffee grounds,[37][38] more advanced training for larger scale farming,[39] spawn production and lab work[40] and growing facilities.[41]

Events are organised with different intervals. The Mushroom Learning Network gathers once a year in Europe. The International Society for Mushroom Science gathers once every five-years somewhere in the world.

References

  1. Chang, Shu-Ting; Chang, S.; Miles, P.G. (2004). Mushrooms, Cultivation, Nutritional Value, Medicinal Effect, and Environmental Impact. CRC Press. pp. 15, 17, 69, 73, 139. ISBN 0-8493-1043-1.
  2. Bratkovich, Stephen M. "Shiitake Mushroom Production: Fruiting, Harvesting and Crop Storage". Archived from the original on 20 March 2001.
  3. "Cultivating mushrooms in natural logs". Global Village Institute. 2001 [1998]. Archived from the original on 25 December 2007.
  4. Hill, Deborah B. "Introduction to Shiitake: The "Forest" Mushroom. Kentucky Shiitake Production Workbook" (PDF).
  5. Davis, Jeanine M. "Producing Shiitake Mushrooms: A Guide For Small-Scale Outdoor Cultivation on Logs" (PDF). North Carolina Cooperative Extension Service.
  6. "Shiitake and Oyster Mushrooms" (PDF). University of Kentucky College of Agriculture New Crop Opportunities Center.
  7. Mudge, Kenneth. "Forest Farming". The Magazine of the Arnold Arboretum. 67: 26–35.
  8. Bruhn, J.N.; Mihail J.D. (2009). "Forest farming of shiitake mushrooms: Aspects of forced fruiting". Bioresource Technology. 100 (23): 5973–5978. doi:10.1016/j.biortech.2009.01.079. PMID 19608411.
  9. Leatham, G.F. (1981). "Cultivation of shiitake, the japanese forest mushroom, on logs: A potential industry for the united states". Forest Products Laboratory.
  10. "Mushroom cultivation underground". Bradford on Avon Museum. Retrieved 31 March 2022.
  11. "Crop Profile for Mushrooms in Pennsylvania". January 1999. Archived from the original on 27 December 2007.
  12. Daniel J. Royse; Robert B. Beelman. "Six Steps to Mushroom Farming".
  13. "Basic Procedures for Agaricus Mushroom Growing" (PDF). College of Agricultural Sciences, Agricultural Research and Cooperative Extension. Archived from the original (PDF) on 21 September 2007.
  14. "Handleiding oesterzwammen kweken op koffiedik - Zaailingen".
  15. "Indoor Oyster Mushroom farming, a livelihood diversification option for flood affected families". answers.practicalaction.org. Retrieved 17 April 2019.
  16. "Kit and caboodle — Gardening kits make for great gifts as we huddle indoors". Arkansas Online. 19 December 2020. Retrieved 20 January 2021.
  17. "Oakland's Back to the Roots bets big on indoor gardening". SFChronicle.com. 24 April 2018. Retrieved 20 January 2021.
  18. "Mushroom Cultivation Using Rice Straw As a Culture Media". Archived from the original on 31 March 2019. Retrieved 31 March 2019.
  19. Ergün Baysal; Hüseyin Peker; Mustafa Kemal Yalınkılıç; Ali Temiz (10 March 2003). "Cultivation of oyster mushroom on waste paper with some added supplementary materials". Bioresource Technology. 89 (1): 95–97. doi:10.1016/S0960-8524(03)00028-2. PMID 12676506.
  20. Salmones, D; Salmones D; Mata G; Waliszewski KN (March 2005). "Comparative culturing of Pleurotus spp. on coffee pulp and wheat straw: biomass production and substrate biodegradation". Bioresour Technol. 96 (5): 537–44. doi:10.1016/j.biortech.2004.06.019. PMID 15501659.
  21. Job D., D. (December 2004). "Use of coffee grounds for production of Pleurotus ostreatus". Revista iberoamericana de micologia. 21 (4): 195–7. PMID 15709800.
  22. "The Mushroom Growers' Information Site". 27 June 2007.
  23. Jess, S; Jess S; Bingham JF. (April 2004). "Biological control of sciarid and phorid pests of mushroom with predatory mites from the genus Hypoaspis". Bull Entomol Res. 94 (2): 159–67. doi:10.1079/ber2003286. PMID 15153298. S2CID 11318946.
  24. Beyer, D.M.; Wuest, P.J; Anderson, M.G. "Green mold of Mushrooms".
  25. Compton, C. C. (1 April 1935). "Factors Relating to the Control of the Mushroom Mite, Histiostoma Gracilipes Banks". Journal of Economic Entomology. 28 (2): 465–468. doi:10.1093/jee/28.2.465. ISSN 1938-291X.
  26. Hill, A.; Deahl, K. L. (1978). "Description And Life cycle Of A New Species Of Histiostoma (Acari Histiostomidae) Associated With Commercial Mushroom Production". Proceedings of the Entomological Society of Washington. 80: 317–329. ISSN 0013-8797.
  27. Phillips, Roger (2006), Mushrooms. Pub. McMilan, ISBN 0-330-44237-6. P. 266.
  28. "September is mushroom month in Pennsylvania".
  29. Shepphard, Tenopra M. "Mushroom Summary" (PDF).
  30. "Mushroom Industry Report (94003)".
  31. "Mushrooms" (PDF). Agricultural Statistics Board. NASS, USDA. August 2007.
  32. "Mushroom Waste Management Project Liquid Waste Management" (PDF). March 1998.
  33. "Sylvan Inc. – World's Largest Mushroom Spawn Producer – Spawn". www.sylvaninc.com. Retrieved 27 November 2016.
  34. Wakchaure, G C (1 February 2011). "Production and Marketing of Mushrooms: Global and National Scenario". ResearchGate. doi:10.13140/RG.2.1.5012.3682.
  35. "RotterZwam". www.rotterzwam.com. Archived from the original on 20 December 2016. Retrieved 15 December 2016.
  36. "PermaFungi | Eat – Grow – Learn". www.permafungi.be. Retrieved 15 December 2016.
  37. "Mushroom Master Program – Mushroom-cultivation". Retrieved 15 December 2016.
  38. "Grow Mushrooms on Coffee | Learn How To Grow Mushrooms on Coffee". www.growmushroomsoncoffee.com. Retrieved 15 December 2016.
  39. "Ekofungi School – The smart start to your sustainable mushroom business". www.ekofungischool.com. Retrieved 15 December 2016.
  40. "Mycelia – Cleanroom technology training – Mycelia BVBA". www.mycelia.be. Archived from the original on 21 December 2016. Retrieved 15 December 2016.
  41. www.netfinitiva.com, NETFINITIVA S.L. "Cursos cultivo de hongos o setas. Capacitación en producción de sustratos para hongos y micelio". www.hongosbiofactory.com. Retrieved 15 December 2016.
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