S4T 
YOI.XXI 
MAY 2, 1921 
No, 3 
*■■* -JG$ f 
!?• V.?v : ' ; ' 
t«g;x; 
CONTENTS 
. - ' Cotton Rootrot in the San Antonio Rotations - 
v : ' C.-S. SCOFIELD 
(Contribution from Bureau of Plant Industry) 
Life History of Recurvaria milleri, the Lodgepole Pine 
Needle-Miner in the Ydsemite National Park, California - 127 
. V J« E. PATTERSON i '' ‘ 
. J (Contribution from Bureau of Entomology) ' -/ ' 
- A Bacterial Budrot of Cannas r 143 
. MARY K. BRYAN 
(Contribution from Bureau of Plant Industry) - 1. 
A Chlorosis of Conifers Corrected by Spraying with Fer¬ 
rous Sulphate - - ' _ ■ •_ _ 
; ; CLARENCE F. KORSTIAN, CARL HARTLEY, LYLE F. WATTS, 
and GLENN G. HAHN 
Rooting Stems in Timothy 
R. A. OAKLEY and MORGAN W. EVANS 
( Contribution from Bureau o! Plant Industry) 
Collar-Rot of Tomato - - _ _ 
F. J. PRITCHARD and W. S. PORTE 
( Contribution from Bureau of Plant Industry) 
Bacterial Leafspot Disease of Celery 
IVAN C. JAGGER 
(Contribution from Bureau of Plant Industry) 
173 
179 
185 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 
WITH THE COOPERATION OF THE ASSOCIATION OF 
LAND-GRANT COLLEGES 
WASHINGTON, D. C. 
"14 
WASHINGTON : GOVERNMENT PRJNTINO OFFICE : 102! ' 
