No. 4.] SPRAYING OF CROPS FOR PROFIT. 



263 



prevented by the use of Paris green, and the leaf blight 

 and cracking of the fruit by the use of the Bordeaux 

 mixture and copper sulphate solution. 



The Plum. 

 The fruit of the plum may be largely saved from injury 

 by the plum curculio by the use of Paris green, and the 

 injury to the tree by the black knot and the leaf blight and 

 to the fruit by the monilia or brown rot may be prevented 

 by the use of the Bordeaux 

 mixture and the copper sul- 

 phate solution. Plate I. illus- 

 trates a plum tree sprayed, and 

 Plate II. one of the same va- 

 riety unsprayed. The large 

 crops of plums that are borne 

 on the trees in the Hatch Ex- 

 p e r i m e n t Station orchards, 

 some trees of which are over 

 thirty years old, and their free- 

 dom from the black knot are 

 proofs of this assertion. The 

 aphides that have been so de- 

 structive to the plum in the past 

 two seasons can be destroyed by 

 the use of the kerosene emulsion 

 or kerosene and water. A pump 

 for the use of kerosene and 

 water is shown in fig. 1. The Japanese plum trees cannot 

 be sprayed with Paris green after the foliage has opened, 

 and, as an arsenate is necessary for the destruction of chew- 

 ing insects, arsenate of lead must be used. 



The Peach. 

 This fruit, while not so much benefited by spraying as 

 some of the other fruits, may be sprayed with the Bordeaux 

 mixture to prevent the leaf curl, the shot-hole fungus and 

 the rottino; of the fruit. Paris o-reen cannot be used on the 

 peach, but the arsenate of lead may be used for the destruc- 

 tion of the plum curculio. The peach aphis, which causes 



Fig. 1. 



