New York Agricultural Experiment Station. 



359 



CHKONOLOGICAL RECORD OF THE FIELD. 



July 13. First Sprai/ivf/. The plants were well up, the majority 

 of them having- two loawi^ besides the seed-leaves. Plats I. 

 Ill and \- were sprayed witli .ISordeaux mixture (l-to-7 for- 

 mula). Thirty-six gallons of Bordeaux mixture were used 

 and the time consumed in making and applying it was about 

 three hours. Plats II and IV not sprayed. 

 July 24. Second Spniyiny. The plants had been growing very 

 rapidly and appeared to be in perfect health. Plats I, III 

 and V sprayed again (l-to-7 formula). Bordeaux mixture 

 used, 58 gallons. Tinif. .-, hours. Plats II and TV not 

 sprayed. 

 July 30. On the plants in Plats I, II! and \' many leaves were 

 yellow around the mar^ns, while the plants in Plats II and 

 IV were in perfect health and showed none of the yellow 

 leaves. Thus it appeared that the iujui-y was due to the 

 Bordeaux mixture applied on July 24. Two questions now 

 arose, viz. : Had the Bordeaux mixture been improperly pre- 

 pared? or, Had it been used in a too concentrated form? 

 August 3. Third Sprayiinj. The plants on Plats I, III and \' still 

 showed decided injury. l>]ats II and I\^ were perfectly 

 healthy. Plats I, III and V sprayed again. Fearing that 

 the Boideaux mixture had been (oo strong iu the first two 

 sprayings, the 1-to-ll formula was used this time. Bor- 

 deaux mixture used, 75 gallons. Time, hours. In order 

 to determine whether the injury from Bordeaux mixture in 

 the second spraying was due to a too concentrated mixture, 

 the center two rows in Plat IV (^vhich ui. to this time had 

 not been sprayed at all) were treated as follows: One row 

 was sprayed with carefully prepared Bordeaux mixture of 

 the l-to-7 formula and the other row with Bordeaux mixture 

 of the 1-to-ll formula. Hereafter, these two rows will be 

 referred to as " test rows.'' 

 August 7. The first appearance of the yellow spots of the downy 

 mildew. 



