The Bulletin. 27 



PART II. 

 ORCHARD SPRAYING. 



INTKODUCTION. 



In the first part of this Bulletin we have fully discussed the San 

 Jose Scale and the remedies for it. And that opens the way for a gen- 

 eral discussion of orchard spraying for the control of many other kinds 

 of insects and diseases which damage our trees and fruit every year. Any 

 person who has an orchard large enough to yield fruit to sell should cer- 

 tainly know the different mixtures used in spraying, how they are pre- 

 pared, when to use them, and why — for spraying means money profits to 

 such a person, whether there is any San Jose Scale in his orchard or not. 

 And the person who has San Jose Scale should have the same informa- 

 tion, because when he is once prepared to spray his trees for scale, it is 

 a simple matter to go a little further and give the other treatments for 

 the other pests. The only persons who are really justified in not spray- 

 ing are those who have only a few trees for home use and these not in- 

 fested with scale. 



The demand for information about the spraying of fruit trees is very 

 active and scores of our fruit growers are taking up spraying each year 

 who have not followed the practice before. 



'Tlease give me full directions for spraying my orchard." That is a 

 common form of inquiry, and while we give much of the information 

 needed in these pages, yet the grower must remember that there are many 

 small details that can be mastered only by experience and observation. 



Just at this time there is some uncertainty as to the relative merits 

 of the Bordeaux Mixture and the Lime-sulphur Wash for the control of 

 fungous diseases in the orchard; but the recommendations as given in 

 this Bulletin are based, not only on our own experiences and observa- 

 tions and the experience of growers in the State, but also on the recom- 

 mendations of the officials in the United States Department of Agricul- 

 ture. We feel sure, therefore, that they are as near correct as they can 

 be made from present knowledge. In this Bulletin we give preference 

 to Arsenate of Lead as the poison to use in spraying fruit trees, as results 

 from its use are much better than from Paris Green. 



Insect pests and diseases of various kinds make it necessary to spray 

 our fruit orchards. Examine our fruits in summer or fall and notice the 

 knotty, dwarfed, wormy and specked ones, and you will be convinced. 

 However, some of the diseases and insects which attack the apple are 

 quite different from those which attack the peach, so that the treatment 

 is different for these two fruits. Hence we discuss separately the spray- 

 ing of the apple orchard and the spraying of the peach orchard. Pears 



