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GROWING GOURMET - Anto2ni.it

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320 GROWTH PARAMETERS<br />

similar effect to that seen under elevated carbon dioxide cond<strong>it</strong>ions is induced. When exposed to high<br />

light levels, pigmentation of the cap is usually enhanced. Blue strains become bluer. Brown capped<br />

strains become a richer brown. Similar results are also seen at lower end temperatures given constant<br />

light cond<strong>it</strong>ions.<br />

Thorn and Barron (1984) first noted that P ostreatus exudes a metabol<strong>it</strong>e toxic to nematodes. As<br />

the nematode lies stunned, the mycelium soon invades through one of <strong>it</strong>s orifices, quickly consuming<br />

the internal organs. From an evolutionary viewpoint, this is remarkable that a saprophytic mushroom<br />

can become predatory to an animal in <strong>it</strong>s quest for new sources of n<strong>it</strong>rogen. This may well explain<br />

why nematodes have never been reported as a pathogen in Oyster mushroom cultivation whereas<br />

their occurrence in the cultivation of the Button mushroom (Agaricus brunnescens) is economically<br />

devastating and commonplace.<br />

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