19^5 



BETTER FRUIT 



Page 3. 









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, W.Tsliiiigton 



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 it droi)s from 

 the trees in the middle of the growing 

 season. The <lamage to the twigs is 

 less apparent, if there is any distinct 

 damage, further than that of furnish- 



