DETERMINING TIME OF APPLICATION 297 



Typical spray schedules are incorporated herewith. They 

 are not intended as guides but merely as illustrations. Sched- 

 ules vary for different regions and for the various fruits. They 

 vary also for the same regions in different years, depending 

 upon climatic conditions, the evidence of an epidemic of 

 disease or insect pests, and the acquirement of greater knowl- 

 edge with respect to control. 



In many schedules the proportions of lime-sulfur are given 

 as 1-30, 1-40, 1-50, etc. This means that 1 gallon of a stand- 

 ard solution is used to 30, 40, or 50 gallons of water. 



Proportions of lead arsenate are given in terms of the 

 powdered form, unless otherwise indicated. 



The term nicotine, unless otherwise defined, refers to 

 nicotine sulfate. 



SPRAYING SCHEDULES, NEW YORK STATE COLLEGE OF 

 AGRICULTURE, 1939 



Cornell Extension Bulletin 314 (revised, 1939) 



Spray Outline for Apples 



Dormant Spray. For the control of rosy aphis, tar-distillate emulsion 

 containing 21/^ percent of tar oil in the diluted mixture may be applied 

 while the buds are dormant. If the amount of tar oil is increased to 4% 

 percent, it will also control infestations of oyster-shell scale, bud moth, 

 and scurfy scale. 



The different brands of tar-distillate emulsions vary considerabl}^ in 

 composition. Tar-distillate emulsions should be applied in the spring 

 before the buds show green at the tip and should not be used on trees 

 that are winter-injured. 



For San Jose scale and red-mite eggs, a 3-percent lubricating-oil 

 emulsion may be used. Under certain conditions the oil emulsion may 

 be combined with a tar-distillate emulsion. 



For severe infestations of the fruit-tree leaf-roller, lubricating-oil 

 emulsion diluted to contain from 5 to 6 percent of actual oil in the 

 spray may be applied. Scurfy scale is held in check by the 6-percent 

 concentration. The treatment is made after the buds have begun to 

 swell but before they show green at the tip. 



