EXPERIMENT STATION BULLETINS. 



313 



different plats, counts of the sound and diseased grapes were made be- 

 tween September 23 and October 2; 1,000 bunches from each of the 

 spraj^ed plats and 100 from the check being taken. 

 The following tables show the treatment of each plat : 



PLAT NO. 1. 



PLAT NO. 2. 



Fungicide used. 



3 lbs. CuS04 to 50 gals, water 



4-4-50 Bordeaux 



4-4-50 Bordeaux 



4-4-50 Bordeaux 



4-4-50 Bordeaux with 2 lbs. soap 



Burgundy mixture (2) 



Burgundy mixture (2) 



Stage of growth. 



Dormant. ' 



Just beginning to blossom. 

 Just after blossoming. 

 Grapes about size of peas. 

 Grapes about one-third grown. 

 Grapes about one-half grown. 

 Grapes three-fourths grown. 



PLAT NO. 3. 



1907. 



Check. — Unsprayed except dormant appHcation of copper sulphate solution. 



PLAT NO. 4. 



The amount of rot on the plats at the close of the season was deter- 

 mined by actual count of the numbei' of sound and affected berries on 

 1,000 average bunches from each plat, as stated above. 



Just across a roadway at the south end of this vineyard was another 

 which was very severely injured by black rot, in fact most of the crop 

 was destroyed before the fruit was much over half grown. In order to 

 get some idea of the effect of this apparently serious source of infection 

 upon the portions of our plats closest to this vineyard, counts were 

 made of the affected grapes at both ends of the rows, those adjoining 

 the neglected vineyard and those fartherest from it. 



The following table shows the percentage of rot at both ends of each 

 plat and also the difference. 



*CuSO* is copper sulphate. 

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