144 Kepout of the Botanist of thb 



remained green until the middle of October, but observation 

 showed that it was only the growth made between July 1 and 

 August 10 that survived the attacks of the rust until October 

 15; that is, a growth that was completed, hardened, and thor- 

 oughly sprayed before the rust struck the bed. All the new 

 sprouts which came up in the sprayed rows after the rust ap- 

 peared in the field were destroyed. There were two and possibly 

 three of these periods of late growth, namely, about August 15 

 and September 15. As in tests of 1898, the asparagus foliage 

 was not injured in the least by the resin-Bordeaux mixture. 

 Tests in laboratory showed that the solution of copper sulphate 

 could be neutralized by the use of the resin solution alone, but a 

 mixture of resin soap resulted which would have been impossi- 

 ble to spray. Possibly the excess of potash in the resin solu- 

 tion was the neutralizing agent and not the resin itself. Which- 

 ever it was, this is certain : that by first making the Bordeaux 

 mixture with lime in the usual way, and then adding the stock 

 resin solution at the rate of one gallon to twenty-four gallons 

 of Bordeaux mixture, a fungicide was' obtained which has not 

 injured the asparagus foliage in the least during three seasons' 

 trials, namely, 1898, 1899 and 1900; furthermore, the resin solu- 

 tion aids somewhat in making the mixture adhere to the smooth 

 surface of the asparagus. 



During 1900 the crop cut from all the rows of the test acre 

 was weighed as in 1899. As the fifteenth row showed a slight 

 advantage in yield (about 18 pounds) over the other rows pre- 

 vious to spraying, its yield is not included in the tables, although 

 it was sprayed, hence the sprayed portion was two-fifths of 

 an acre. 



RESULTS. 



The first cutting in 1900 was made May 14, and the last on 

 July 2, the total number of cuttings being thirty-eight. This 

 method gave us not only the yield of the sprayed rows before 

 and after spraying, but also the yield of the adjoining unsprayed 

 rows for two seasons. 



The preliminary cuttings made in the season of 1899 brought 



