1 88 Lime-sulphur Wash for Use on Foliage, [june, 



reaction takes place, bringing about the solution of the lime 

 and sulphur. The best proportions of lime and sulphur to 

 use are believed to be those given above. 



After application to the leaves, the wash is acted upon at 

 once by the atmosphere, with the result that sulphur is almost 

 instantaneously deposited. The sulphur thus deposited is 

 in an excessively fine state of division — the particles being 

 many hundred times finer"* than those of "flowers of sulphur " 

 — and in consequence adheres, in the form of a whitish 

 powder, so intimately to the surface of the leaf that rain will 

 not wash it off. If sprayed leaves, when once the spray is 

 dry, are placed under running water from a tap, it will be 

 found that the whitish powder consisting of sulphur is not 

 washed off. 



The diluted lime-sulphur wash, which is a perfectly clear 

 liquid, should be applied with a nozzle throwing a very fine 

 "misty " spray. The same type of nozzle which is suitable 

 for the application of Bordeaux mixture (see this Journal 

 for January last) is suitable for the lime-sulphur wash. The 

 receptacle of the spraying machine must be wooden or iron 

 (galvanised iron or tin) ; a copper knapsack sprayer must not 

 be used, as the wash acts chemically on this metal. Knap- 

 sack sprayers which are tinned over can be obtained. Accord- 

 ing to the results of experiments recently carried out in the 

 United States, certain arsenical washes can be added to the 

 lime-sulphur wash. 



Summary. — A lime-sulphur wash, made as described above, 

 of the specific gravity roi is efficacious in combating the 

 hop-mildew, and can be recommended for trial against other 

 "powdery mildews," and also against "black spot" or 

 " scab " on those varieties of apples which are liable to be 

 injured by Bordeaux mixture. The lime-sulphur wash is 

 cheap, and as a spray against mildews possesses two great 

 advantages over the "liver of sulphur" solution, viz., (i) it 

 does not readily wash off, (2) the deposition of sulphur which 

 results makes it easy to see where the spray has reached, 

 and if any parts of the tree or bush have been missed. It 

 must be pointed out, however, that Bordeaux mixture is still 



;; The particles are so small that they will pass through filter-paper. 



