Spraying for Black /Sj^o^ of the Apple. 



367 



material into the mixing- barrel, on the toj) of which is placed a 

 copper strainer. After thorough stirring the complete Bordeaux is 

 lifted by buckets into the spra}^ pumps. 



Bordeaux Mixture wnii ^^vl;l()u ; A])I>iti()ns. 



A series of experiments similar to those at Doncaster were carried 

 out, but on a different variety of apple. A number of Buncombes 

 were most conveniently situated for the purpose, and since they were 

 said to be fairly liable to black spot, they were selected, and each |)]ot 

 consisted of two trees. 



Only one spraying was given on Otli October, 19()2, and generally 

 the trees were at that stage when the blossom-buds were here and 

 there showing colour. The two formulas of Bordeaux mixture were 

 tried, 6" 4" 50, and G* 4' 40, and the resulting difference between the 

 two was very slight indeed. The addition of various ingredients to 

 the Bordeaux showed a slight advantage in every case, that of sal 

 ammoniac being the best, while in the Doncaster experiments 

 common salt had the advantage. However, the differences were 

 generally so small, that the results hardly justify a change from the 

 ordinary Bordeaux. 



The unsprayed plot showed only 10 per cent, of black spot, so that 

 the attack was not a very severe one, and the merits of the several 

 mixtures were not sutficiently tested to discriminate between them. 

 There was a good deal of variability in the bearing of the trees, but 

 that was due to other causes than the s})raying mixture. 



TABLE 11— RESULTS OF SPRAYING AT KILLARA. 



Two trees were sprayed on 22nd October with Bordeaux mixture 

 when in full bloom, and although the yield of absolutely clean fruit 

 was not so heavy as in any of the others, with the exception of the 

 check plot, yet the percentage of spot was the smallest, being only 

 1 per cent. In the various spraying experiments, Mr. Hutt, the 

 orchardist, took a lively interest, and intelligently carried out the 

 operations. 



