358 Report op the Horticulturist of the 



its appearance, as it forms dull white powdery patches on the young 

 shoots and on the upper surface of the leaves. When the fung;us is 

 abundant it seriously checks the g^rowth of the vines, by absorbing 

 the nourishment that should have gone to their development. The 

 berries may be attacked at any stage of growth and they are injured 

 or destroyed in the same way as are the shoots or leaves. 



Treatment. — It may be successfully treated in the manner just 

 described for the Black Rot. 



Summary. — The use of strong solutions of copper sulphate or 

 iron sulphate is not recommended except in case of severe attacks of 

 anthracnose as previously stated. Fortunately, Bordeaux mixture 

 has been found to be almost a specific and with the exception just 

 named, the various prominent vineyard diseases are controlled with 

 the one line of treatment advocated for Black Rot. See p. 356. 



Peach. 



Note. — Before discussing the diseases and insect enemies of the 

 peach, attention should be called to the fact that the foliage of 

 stone fruits and especially of the peach is peculiarly liable to injury 

 from Paris green, London purple or copper in solution. For this 

 reason the former should not be used stronger than one pound to 

 about three hundred gallons of water and at least two or three times 

 as much fresh slaked lime as poison should be used. It is doubtful 

 whether more than two sprayings with Paris green or London pur- 

 ple should be given even if diluted to the strength just stated. If 

 Bordeaux mixture is used especial care should be taken to have an 

 excess of lime in the mixture as directed in article IV on Fungi- 

 cides and Insecticides. 



Fruit Rot. — This disease is more fully discussed under the sub- 

 ject of "Cherry Fruit Rot" on p. 351. It is caused by the same 

 fungus that causes ripe rot in cherries, plums and some other 

 fruits. 



Remedies. — Chester^ reports encouraging results in spraying 

 with a solution of copper sulphate, one pound to twenty-five gal- 

 lons of water, applied as a heavy spraying in spring " before the 

 buds began to swell." Previous to this the mummy fruits, relics of 

 last year's diseased peaches and still capable of spreading the dis- 

 ease, were removed. A second spraying using, in one instance, 



4 Annual Report Del. Expt- Sta. 1893 ; 10&-109. 



