245 



6 treatments ; Bordeaux, 5 treatments; ammouiacal solution, 6 treat- 

 ments; ammouiacal solution, 5 treatments. Five treatments with the 

 ammoniacal solution proved almost entirely ineffectual. Plate xxin 

 shows the average of stocks treated times with aiuuioniaeal solution. 



JAPAN PEAR STOCKS. 



1891. One row of 466 stocks was planted in a manner precisely sim- 

 ilar to that described for the French stocks. The dates of treatment 

 were as above given, one half the treated portion receiving three treat- 

 ments and the other seven, one-half being treated with Bordeaux, the 

 other with ammoniacal solution. The results obtained were striking, 

 as illustrated by the following notes on the re-leaved stocks : 



TABLE 3. Showing number of Japan stocks forced to put out neiv leaves. 



The average diameter of the stocks near the collar was not percepti- 

 bly greater in the treated than in the untreated, the average differ- 

 ence amounting to less than one thirty-second of an inch. The un- 

 treated Japan stocks suffered more from the disease than the untreated 

 French stocks. 



1892. The same row of stocks as that employed the previous season 

 was treated, but one-haff or more of the stocks were budded in 1891, 

 as described subsequently on pp. 259, 261. The treatments given were 

 as described on pp. 262-263. As early as June 24 the unbudded stocks, 

 which had not been treated, showed the disease plainly, every stock 

 being affected. At this date it Avas evident that the Japan stocks, as 

 introduced from the south, were more susceptible to leaf-blight than the 

 imported French or the native-grown American stocks. The latter were 

 at this date scarcely affected by the disease. From the two years' ex- 

 periments upon Japan stocks from Franklin Davis & Co.'s nurseries it 

 seems probable that these when imported from the South will not show 

 any greater immunity from leaf-blight than the French or American 

 stocks. A more extended experiment, however, is needed to settle this 

 point. The result of treatments with fungicides was as striking as that 

 gained from the French stocks. The foliage on the budded stocks re- 

 mained reasonably free from the disease until quite late in September 

 when the stocks in the untreated portions began to drop their leaves 

 badly; those treated 6 times with Bordeaux held their leaves almost 

 intact. The Bordeaux proved in general more efficacious than the am- 

 moniacal solution in the treatment of both budded and unbudded stocks, 



