![]() Pleurotus ostreatus (winter), 10-15☌ (50-60☏) Pleurotus pulmonarius (summer), 10-24☌ to 30☌ (50-75☏) You may notice an initial drying out of early stage pinning, as you remove the plastic. If you can, regulate the temperature accordingly. To prevent excessive CO 2 levels, allow the growing area to flush with clean air before spraying. As our climate is very dry, we only managed 60% at best, dropping down to 40%, by spraying 5 litres of water 2 - 3 times a day (even at these humidity levels a good result can be achieved). You can also wet the floor and leave open containers of water in the room (95-100% humidity is recommended). Increase the growing room humidity by regularly spraying with a water sprayer (avoid spraying directly on the mushrooms). Pinning naturally occurs as humidity increases, low levels of light appear and temperature levels fall. Once pinning has started, it is time to remove the substrate from the bags. Finally, as the bags become fully colonised, the initial stages of fruiting (or pinning) may be seen. At this early stage, it is better to simply remove infected bags, as you want to prevent its spread. Up to a 10% loss due to contamination is generally regarded as acceptable. Green moulds are common and can be caused by contaminated spawn (ineffective grain sterilisation), high moisture / low spawn levels and ineffective straw sterilisation. You may also notice sprouting straw and the appearance of unwanted mushrooms such as the ink cap (see pictures). Black mould found within the straw may indicate ineffective sterilisation. Regularly check bags for any mould contamination and remove any infected bags from the growing area. You may want to spray some surfaces to deter flies and other insects from setting up home, mesh any windows and keep doors closed. However, the best policy for fighting both contamination and infestation, is prevention. While the straw is still in the bags, you shouldn't have a problem with insects or mice. It is important to monitor the bags for any sign of unwanted moulds and pests.
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