During the winter of 1891 and 1895 a trouble known as "Pimply potatoes," among potato growers, was brought to our attention. As the trouble appeared to be some skin disease, it was turned over to Mr. F. C. Stewart, the mycologist. At the time he came to no definite conclusion as to what the trouble might be. Early in the fall of 1895 Mr. Stewart obtained a quantity of "Pimply potatoes" for microscopic examination. It was found that the pimples covered what appeared to be a brown ''sliver" in the flesh of the potato. This ''sliver" proved to be a tube lined with broken starchless cells, the starch grains usually occurring free within the tube. Our natural conclusion was that the trouble was caused by the puncture of some insect and that the pimple resulted as an effort of the growing potato to heal the puncture.
Proceedings of the Iowa Academy of Sciences
©1896 Iowa Academy of Science, Inc.
Sirrine, F. A.
"Note on Probable Life History of Crepidodera (Epitrix) cucumeris, Ham.,"
Proceedings of the Iowa Academy of Science, 4(1), 170-172.
Available at: https://scholarworks.uni.edu/pias/vol4/iss1/30