. The cultivated mushroom ... Mushroom culture. [from old catalog]. INJURIOUS INSECTS 73 one knows that the nitrates have the greatest influence on the development of plants. It is thus probable that they have an influence on the development of mush- rooms and it is doubtless for that reason that long ago the influence of salt- peter on walls, the addition of plaster to manure, etc., has been recognized by- some mushroom growers to give good results. In conclusion, it is well to call attention once more to the absolute ne- cessity of bringing modifications to the medium in which fermentations
. The cultivated mushroom ... Mushroom culture. [from old catalog]. INJURIOUS INSECTS 73 one knows that the nitrates have the greatest influence on the development of plants. It is thus probable that they have an influence on the development of mush- rooms and it is doubtless for that reason that long ago the influence of salt- peter on walls, the addition of plaster to manure, etc., has been recognized by- some mushroom growers to give good results. In conclusion, it is well to call attention once more to the absolute ne- cessity of bringing modifications to the medium in which fermentations or chemical reactions take place. We must never forget that these fermenta- tions or chemical reactions give rise to residuary products, the presence of which is in opposition with the good continuation and with the development of the fermentations and principal reactions. It is only by stirring, sprinkling, aerating, heating or cooling the mass that we can come to transform it in a regular shape; to render it homogeneous. That is the chief end in working the manure for the production of the special state of humus favorable to the mushroom culture. INSECTS INJURIOUS TO MUSHROOMS' Cultivated mushrooms, especially during vi^ann weather, are at- tacked by several species of insect pests which frequently destroy an entire crop, or so curtail the production as to make the industry unprofitable. Although this injury is at times serious, little interest has been taken by entomologists in the matter of its control, so that there is practi- cally no available economic literature on the subject. This circular is of a preliminary nature, as the investi- gation of all insects injurious to mush- rooms may not be completed for some time. The insects which usually attack cultivated mushrooms, and those of which complaints are most frequently made, may be di\-ided roughly into four classes, namely, mushroom tnag- gots, mites, springtails, and sowbugs. Of these the maggots are the most generall
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