. Better fruit. Fruit-culture. AD tractor! The Yuba Ball Tread Tractor is designed and built for use on some type of work every day in the year. Directly in rear of the radiator is a cross-shaft connected to the motor by beveled gears running in oil. The starting crank is on one end of this shaft; on the other end is a stationary pulley. This shaft is not an after-thought, nor is it ornamental. Every Yuba Ball Tread Trac- tor has one and when the operator needs it, he uses it BALL TREAD The stationary pulley is supplied with every machine. When so de- sired, a clutch pulley is furnished as an
. Better fruit. Fruit-culture. AD tractor! The Yuba Ball Tread Tractor is designed and built for use on some type of work every day in the year. Directly in rear of the radiator is a cross-shaft connected to the motor by beveled gears running in oil. The starting crank is on one end of this shaft; on the other end is a stationary pulley. This shaft is not an after-thought, nor is it ornamental. Every Yuba Ball Tread Trac- tor has one and when the operator needs it, he uses it BALL TREAD The stationary pulley is supplied with every machine. When so de- sired, a clutch pulley is furnished as an extra. When there is nothing else to do, The Yuba Ball Tread Tractor will pump water, generate electricity, mix concrete, saw wood, cut feed or furnish power to a sta- tionary thresher. There is a booklet describing it. THE YUBA CONSTRUCTION CO. 433 California Street, San Francisco Dept. G-22 it. Works, Marysville, California Apple Scab—Where Most Prevalent By Professor O. M. Morris, State Agrii-ullural College, Pllllni:ui, THIS disease is too well known to iX'iUiire a eareful description. It is distributed over every district tliMt i>rows apples and has sufTicient rainl'iill to grow the crop without irri- «;Uion. The districts that have the most cloudy, damp, rainy days duriiiij the growing season ordinarily are the ones that have tlie greatest amount of scab-infested fruit. In the Northwest this disease is most prevalent in the Coast regions, in the highland districts of the Rocky Mountain region and in the highland on the east side of the Cascades. The disease works on tlie fniil, foliage and twigs, and is <listinctly de- structive to the connnercial value of the fruit. The amount of damage done to the foliage and to the vigor of the trees in general by reason of the at- tacks on the foliage cannot be so easily and distinctly measured. That great damage is fieiiuently done cannot be (lotii)ted from (he fact that the foliage is so l)a(lly damaged that i
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