That like produces like even among molds

That like produces like even among molds

If you plant many other kinds of mold you will find that the molds come true to the kind that is planted; that like produces like even among molds.

You can prove, also, that the mold is caused only by other mold. To do this, put some wet bread in a wide-mouthed bottle and plug the mouth of the bottle with cotton. Kill all the spores that may be in this bottle by steaming it an hour in a cooking-steamer. This bread will not mold until you allow live mold from the outside to enter. If, however, at any time you open the bottle and allow spores to enter, or if you plant spores therein, and if there be moisture enough, mold will immediately set in.

Fig. 115. A Highly Magnified Section of Diseased Pear Leaf
Showing how spores are borne

Fonte: Agriculture for Beginners