. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. APPLE DISEASES 487 vicinity of stands of infected cedars and native pome fruits. The examination of the orchard men- tioned by Mr. Zepp in his letter as quoted revealed a very interesting situation. Not over 100 feet from the nearest pear tree stand half a dozen incense cedar trees of various ages, from those but a few years old to those probably
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. APPLE DISEASES 487 vicinity of stands of infected cedars and native pome fruits. The examination of the orchard men- tioned by Mr. Zepp in his letter as quoted revealed a very interesting situation. Not over 100 feet from the nearest pear tree stand half a dozen incense cedar trees of various ages, from those but a few years old to those probably 50 years old or more. A careful examination of these trees showed that practically the entire foliage was covered with the telial stage. The readiness with which the nearby cul- tivated pome fruits, as well as the cedars, were infected might easily be understood, since the heavy wind currents, moving up and down the small canyon in which the trees are growing, easily carried the spores. During the course of the writer's studies inoculation experiments were taken up and it was shown that practical- ly all pome fruits could be infected by this rust. Hosts The hosts upon which the fruiting stage of this rust have been produced by inocu- lation from the incense cedar, are as fol- lows: Apple, flowering crab, pear, mountain ash, native crab apple, quince, Japan quince, serviceberry, thorn apple or haw. P. J. O'Gara Scab Venturia pomi H. S. Jackson Apple scab is the most serious and most generally distributed fungous disease of the apple known, and in the Northwest during favorable seasons, west of the Cas- cade mountains, is particularly severe. Symptoms Apple scab attacks both foliage and fruit. On the foliage the spots are at first more or less circular in outline, olive green or brown in color, becoming darker and more irregular in shape as they be- come mature. The leaves are frequently more or less curled or wrinkled. When the spots are abundant, the leaves fall prematurely an
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Keywords: ., bookcentury1900, booksubjectfruitculture, booksubjectgardening
