IN THE construction of a mushroom house, care 

 should be taken to make the building as tight as 

 possible, with outlets capable of being tightly 

 closed. All windows and ventilators should be 

 screened with fine wire gauze; this forms an excel- 

 lent prevention against the entrance of both fungus 

 gnats and the mites which they carry. 



Mushroom spawn should be purchased only from 

 reliable dealers. 



The preparation of the compost should be careful 

 and thorough, and the temperature of the house 

 should be kept as low as possible, preferably below 

 55° F., thus reducing to a minimum the multiplica- 

 tion of any insects which may be present. 



If the manure is carefully selected and properly 

 composted and the temperature and moisture con- 

 ditions are right, it should seldom be necessary to 

 resort to such radical measures as fumigation, steril- 

 ization, or the destruction of the beds. 



