This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Prof. Burrill, of the Industrial University of Illinois, and one of the most conscientious investigators of minute fungi, has the following attributed to him, going the "rounds" in the agricultural papers:"There is good evidence that the theory of the fungus origin of the fire-blight of the pear, and the common twig-blight of the apple, is well founded, but, though particular species, or what have been regarded as species, are known to accompany the disease, proof has not yet been obtained as to their causing the death of the limbs, nor as to the real action of any fungi upon these limbs. In the meantime, besides every attention to secure vigor and healthfillness of development with little pruning, carefully washing in winter time with a strong alkaline substance in solution is recommended for trial, and as careful removal and burning of every dead limb or twig as soon as observed, winter or summer." If the origin of apple and pear blight is, "on good evidence," fungoid, and it thus becomes an advantage to "burn every diseased twig," to keep the spores from settling on healthy wood, and spreading disease, what is meant by the statement that "proof has not yet been obtained as to their causing death ? "What is the difference between "good evidence "and "proof? "Prof. Burrill has no doubt been incorrectly reported.