248 



stated in a previous publication * the insignificant quantity of leaf- 

 blight present offered no opportunity to test the fungicides in a satis- 

 factory manner. 



1892. The same row of cuttings as employed in 1891 was treated this 

 season, but one-half or more of each section had been budded the fall 

 previous, as noted below, p. 2GO. The treatments were identical with 

 those made upon the pear stock; see p. 262. As early as July 7 the 

 leaves on the untreated section left without budding showed the dis 

 ease plainly, while the foliage of those sections treated with Bordeaux 

 and arnmoniacal solution remained free from the disease. By August 

 30 two-thirds of the foliage of the unbudded, untreated portion had 

 fallen to the ground, while the treated sections standing in the same 

 row, as shown in the plan, p. 257, row V, remained intact. Plates xxiv 

 and xxv show the appearance of the treated and untreated sections. 



On September 29 the difference manifested by these stocks was not 

 one of foliage only. The twigs of the treated, upon close examina- 

 tion, were apparently a trifle more robust, and the caliper of the cut- 

 tings at the base showed a considerable increase not to be attributed 

 to differences in soil. Below are given the data secured from a careful 

 calipering of the unbudded stocks at the collar, made October 15. The 

 figures given are in thirty-seconds of an inch and represent the aver- 

 age diameter of stocks in each section: 



TABLE 6. Showing average caliper of treated and untreated unlndded quince stocks. 



* Unfortunately a section. Cb2, was not staked off in planning the experiment. 



The inference from the above table is that the stocks which held 

 their leaves through the season made a greater growth in diameter than 

 those from which the foliage dropped in July and August. Taking the 

 average of all stocks treated with ammoniacal solution, 94 in number, we 

 have 25.7 thirty-seconds of an inch, while the average of 81 stocks 

 treated with Bordeaux was 26.5 thirty-seconds. The better of these two 

 averages (2G.5) when compared with the untreated (20.6) gives an in- 

 crease in diameter of 5.9 thirty-seconds or nearly three-sixteenths of an 

 inch. 



* Bull. No. 3, op. cit., pp. 58-59. 



