^ THE JOURNAL 



OF THE 



BOARD OF AGRICULTURE. 



Vol. XVII. No. \% 



FEBRUARY, 1911. 



SPRAYING EXPERIMENTS WITH A LIME- 

 SULPHUR SUMMER WASH. 



E. S. Salmon, F.L.S., 



Mycologist to the South-Eastern Agricultural College, Wye, Kent. 



In this journal for June last (p. 184) an account was given 

 of a method of making a lime-sulphur wash for use on foliage, 

 and of some results obtained on using this wash against the 

 hop "mildew" or "mould." During the past summer 

 further spraying experiments with this wash were carried 

 out on the foliage of apples and gooseberries in the planta- 

 tions at the South-Eastern Agricultural College, Wye, and 

 on two farms in Kent. 



Before giving the details of these experiments, a few 

 remarks may be made on the subject of lime-sulphur 

 summer-washes and their properties. In England, as in 

 other fruit-growing countries, a good fungicide is required 

 for use on those varieties of apples which are injured when 

 sprayed with Bordeaux mixture. It is now generally recog- 

 nised by apple-growers in this country that— with respect 

 to the greater number of the varieties cultivated commercially 

 — it is impossible to grow a perfectly clean crop of apples 

 (free from all trace of "black spot" or "scab") unless the 

 foliage* of the trees is kept clean by spraying it with Bor- 

 deaux mixture. On some varieties of apple, however, e.g. 

 on "Cox's Orange Pippin" and "Duchess' Favourite," 

 the use of Bordeaux mixture is liable to be attended by such 

 marked injury to the leaves (resulting in a more or less com- 

 plete defoliation of the tree) or to the fruit (which becomes 



* See the article on Apple " Scab " or » Black Spot," in Ms Journal for June, 

 1908. 



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