1. Improper selection on strain: it is proper to choose varieties of mid-temperature, low temperature and precocious in autumn cultivation of Shiitake, choose varieties of low temperature and late- mature. If people choose late-mature variety in autumn cultivation, strains can reach the physiological mature in 3 or 4 months after inoculation and will not get fruited in current autumn and winter. If people choose mid-temperature or precocious varieties in spring cultivation, spawn-running will happen in 60 to 70 days after inoculation. When fruiting, the temperature rises, which is not fit for the formation of sporocarps and fruiting may not be realized. If fungus tubes are in good conditions, people can keep them through the summer and realize fruiting after cool autumn days. Control method: people should choose suitable varieties in accordance with local climate condition and cultivation season.
2. Immature growth in spawn: during the inoculation from spawn to substrate, sporocarps can be formed when the growth get matured. The age of spawn is affected by strain characteristic and the environment. What’s more, temperature plays a key role in the growth of spawn. The suitable growth temperature of mid-temperature and low temperature is from 20 to 27 degrees, if the temperature of spawn is always in below 20 degrees, especially below 10 degrees, fruiting cannot happen for the reason of immature growth on spawn, inadequate accumulated temperature. Control method: people should put mushroom bags in 20 to 25 degrees, or pile fungus tubes up, cover thin film to increase the temperature of piles and stimulate the growth of spawn.
2. Unsuitable sowing time: people should choose the most suitable sowing time in all cultivation, the sowing time of general mushroom is in spring and autumn. Too early sowing will cause high temperature and easy to infect sundry fungus. Too late sowing will cause low temperature and fruiting cannot be realized. The suitable sowing time of spring cultivation is from January to March. Control method: people should choose suitable sowing time in accordance with local climate character.
3. Degeneration on age of strain or nonstandard strain-making: due to frequent passage, improper preservation, too high temperature of strain-making or too long preservation time on strain, which will cause degeneration. If people use degenerated strain, some phenomenon such as late germination, slow spawn-running, unsuccessful fruiting or few fruiting will happen. Another reason is nonstandard on spawn-making, in order to save time, some strain factories reduce cost and expansively make protospecies into protospecies again, or expansively make cultispecies into cultispecies. This kind of strain will not get fruited in cultivation. Control method: people should strictly control the passage time and generally control within 4 times. Strain factories should have basic facilities for producing strain and conditions for preserving strains. It is forbidden to conduct expansively-making. For purchasers, when buying strains, they should understand name, character and select those with neat and robust growth strains. When making strains by themselves, they should calculate the growing time of strain in accordance with cultivation time to avoid too long period preservation period of strains.
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