. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Pr:Acii LicAK CuuL. 283 in the development and opening of the bud in the spring. This is proved by the fact that spraying before the buds swell will prevent the disease, while if the application is made after the tifjs of the leaves show, the disease is seldom well controlled. Circumstantial evidence indicates that spores of the fungus are har- bore
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Pr:Acii LicAK CuuL. 283 in the development and opening of the bud in the spring. This is proved by the fact that spraying before the buds swell will prevent the disease, while if the application is made after the tifjs of the leaves show, the disease is seldom well controlled. Circumstantial evidence indicates that spores of the fungus are har- bored through the winter most probably on or between the bud scales. When the buds swell the tender leaves wathin are thus exposed and if rains come at this time the spores probably germinate, sending forth (^hore 6c>or/hG. ^r/nimotarc shore '\ Sac myce/ii/m of^/iofu/iqas c/row/nq //7 t/^e //'ssi/e Fio. 81.—Cross section of a diseased portion of a leaf, showing the fungus and its relation to the leaf tissue. Highly magnified. a germ tube which penetrates the young leaves within, thus establish- ing the fungus. Evidence of the presence of the parasite, even before the protruding leaves unfold, is often to be found in the reddish puffs or spots on the young leaves. Thin cross-sections through a diseased leaf will show an abundance of the root-like mycelium of the fungus. (Fig. 81.) This mycelium irritates the growing cells of the young leaf, causing an evident increase in the number and size of the cells, as well as marked changes in their form and structure (Fig. 82). These changes are apparently very favorable to the growth and development of the parasite, but are most. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State College of Agriculture; Cornell University. Agricultural Experiment Station.
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