112 DECIDUOUS FKUIT INSECTS AND INSECTICIDES. 



utility of the one-spray method under eastern conditions is greatly 

 lessened on account of the necessity in most regions of giving orchards 

 additional applications of fungicides for the prevention of such dis- 

 eases as apple scab, bitter rot, apple blotch, sooty blotch, etc. In 

 regions where bitter rot and apple blotch are not troublesome and in 

 the case of varieties little susceptible to apple scab, the single appli- 

 cation would be most likely to have value, and orchardists thus situ- 

 ated should determine the applicability of the method under their 

 respective conditions. Where additional sprayings are necessary for 

 fungous diseases, an arsenical should be added, as the additional cost 

 is slight. 



One very important fact has been developed as a result of these 

 studies, namely, the importance of great thoroughness in spraying 

 after the falling of the petals. While this has been insisted on by 

 entomologists for many years, yet the great extent to which the cod- 

 ling moth may be controlled by this one treatment has not been appre- 

 ciated. The aim should be to poison the calyx cup of each and every 

 apple on the tree, irrespective of whether subsequent treatments are 

 to be given. Imperfect spraying at this time can not be remedied by 

 any number of later applications. 



ADDITIONAL COPIES of this publication 

 -ii- may be procured from the Superintend- 

 ent of Documents, Government Printing 

 Office, Washington, D. C. , at 5 cents per copy 



