/p/; 



BETTER FRUIT 



The Length of Ascospore Activity 



By Leroy Chllds, Entomologist and Plant Pathologist, Hood River Branch Experiment Station 



FROM investigations carried on dur- 

 ing the past three years relative to 

 the control of apple scab in the Hood 

 River Valley, Oregon, it has been found 

 that the so-called "pink application" or 

 cluster-bud application as used through- 

 out the Eastern States as the first scab 

 spray is not sufficiently early to obtain 

 complete control of the disease. Jack- 

 son and Winston (1) in their investi- 

 gations of 1914 at Hood River failed to 



control scab owing to the fact that 

 serious infection occurred before they 

 made their first or cluster-bud appli- 

 cation. 



In 1915 Mr. J. R. Winston and the 

 writer continued the investigations 

 relative to the control of this disease. 

 Mature ascosporcs were observed in the 

 field about the middle of March. In 

 order to determine whether a spray 

 earlier than the "pink application" was 



Page 75 



necessary all of the experimental plots 

 were divided in two parts; one-half re- 

 ceived the so-called "delayed-dormant" 

 application and in the other half the 

 first spray was applied in the "pink" 

 or cluster-bud stage. Subsequent appli- 

 cations were identical in both sections. 

 In every experiment much better con- 

 trol of the disease was obtained on the 

 trees which received the early spray. 

 In some of these a difference in the 

 control of scab of fully fifty per cent 

 occurred. 



In view of the fact that little is 

 known concerning the life history and 



1917 



1917 



SUN 



1917 februar; 



SUM aoii^^vw 



11 IZI^iSj 

 18 19 

 25 26 



APRIL I9I7 I9I7 MAY 



1917 



SUN MON TUE WEO THU fRJ SAT 



THU m SAT 



5 6 7 « K 1 2 3 4 5 



12 13 14 6 7 8 9 10 11 12 



19 20 21 13 14 15 16 17 18 19 



27 28 20 21 22 23 24 25 26 



a It 27 28 29 30 31 S "t 



1917 1917 flOVElVIBER 1917 



5 



12 13 14 



19 20 21 22T3 



26 27 28 29 30 



THU na sat 



4 5 6 



11 12 13 



7 18 19 20 



25 26 27 



ISth Urd 30th 



N.M. P.Q. r.M. 



SUN MON TUE WED THU fRt SAT 



•Ih Uth im ZSth 1 'Y '} 



LQ. N.M. F.Q. f.N. I L O 



4 5 6 7 8 9 10 

 11 12 13 14 15 16 17 

 18 19 20 21 22 23 24 

 25 26 27 28 29 30 



All the year around tractor 



THE SPRING RUSH is the busy 

 season for Yuba tractors — no 

 time for adjustments, not a 

 moment to be used in making 

 repairs. Tiie busy plowing season is a 

 test of the stamina and sturdiness of the 

 Yuba. 



But no matter how successfully a tractor 

 comes through this endurance test, it is 

 not necessarily a good investment. The 

 spring plowing season does not last long. 



If the tractor is to make good as a year 

 in and year out investment, it must do 

 more than the plowing. It must have the 

 power to pull a harvester, the steadiness 

 to drive a thresher or a pump, the speed 

 for light discing or harrowing and the 

 flexibility for road hauling. 



The Yuba meets these conditions. It 

 is an all-year-around tractor. It com- 

 bines sturdiness and versatility. It re- 

 places all your horses. 



EVSYA 

 nam 



Factories at Marys'ville and Benicia^ California 



Yuba Manulacturingr Company Dcpt.E-1 



433 California St., San Francisco. California 

 Gontli^nmn: Kindly send me catalog and ptici-s on 

 the Yuba Ball Tread Tractor. 



1 am intcrestud in Model I2-20_ 



Name 



Town 



P.O.Box 



Model 20-35l_ 



State. 



Size of farm_ 



Fruit 



Grapes 



( Check main crop raised 1 



Rice 



Hops 



_Grain 

 .Alfalfa 



and there have just been issued new Pump and Plow Catalogs 

 which we will be glad to send prospective buyers. 



Yuba Manufacturing Company, Office: 4.13 California Street, San Francisco 



{Femurly Tht Yuba Censlruclion Company — thtins* in namt tnij) 



