IV. PREVENTION OP FUNGOUS DISEASES IN 

 CHERRY ORCHARDS. 



S. A. BEACH. 



r.oaf-spot. — Fruit rot. — Object of spraying. — Tests of 1895. — Fruit rot 

 cheolied. — Foliage injured. — Tests of 1896. — Foliage not injured. — Spray 

 mixture shows on tlie ripened fruit. — No definite line of treatment as yet 

 adopted. 



Leap-Spot. 



The fimgus which causes the leaf-spot on plum also does great 

 damage to the foliage of cherry trees in nursery and in orchard. 

 It frequently happens that cherry nursery stock loses so much 

 of its foliage from the leaf-spot that the growth of the trees is 

 checked and budding operations are seriously interfered with. 

 In the orchard the loss of foliage, as has already been explained 

 in speaking of the plum leaf -spot, lessens the power of producing 

 good fruit, of forming fruit buds for the next season and of prop- 

 erly ripening the new growth before winter. The disease makes 

 its first appearance and afterwards develops in a manner quite 

 similar to that described for plums, see page 389. Plate XXIX, 

 from a photograph, illustrates the appearance of this disease on 

 cherry leaves. 



Cherry nursery stock was treated for the leaf-spot at this Sta- 

 tion in 1891 and 1892 by Fairchild. He concludes that* it may 

 !>(• sl;i(('d conservatively that Bordeaux mixture, 1 to 10 formula, 

 is a specific for this disease, and that it is undoubtedly superior 

 to the ammonical solution of copper carbonate for this purpose. 



The treatment of cherry trees of bearing age is reported in 

 two or three instances, although in each case but few trees ap 



• Fail-child, D. G. Cherry Leaf Blight, Bull. U. S. Dir. V«e. Pathology 6: 38-39. Report of 

 this Station, 1892, 11: 654-659, pi. 2. 



