EXPERIMENT STATION BULLETINS. 



321 



No. of 

 plat. 



No. of ap- 

 plication. 



I... . 

 II... 

 III.. 

 IV. . 

 V... 

 VI. . 

 VII. 

 VIII 

 IX.. 

 X... 

 XI.. 



6 

 6 

 6 

 6 

 None 

 6 

 6 

 6 

 6 

 6 

 6 



Fungicide u.sed. 



4-4-50 Bordeaux 



4-3-50 Bordeaux 



4-2-50 Bordeaux 



3-2-50 Bordeaux 



Check un.sprayed 



4-2-50 Bordeaux with 2 lbs. soap 



3-2-50 Bordeaux with 2 lbs. soap 



Copper Borate Mixture (2) with 1 lb. soap 



Neutral Copper Acetate 1-50 



Self- Boiled Lime and Sulphur (2) 



Com. Brand liime and Sulphur 1-50.... 



4-2-50 Bordeaux was used for the 6th application on all the plats. 



The percentages of rot were deterniiued by actual count- of the dis- 

 eased berries on 1,000 average bunches as in the previous cases. The 

 yiekl in <S-pound baskets is also given for each plat except the last, the 

 record of which is missing. The smallest percentage of rot, as indicated 

 above, was found on Plat II treated Avith 4-3-50 Bordeaux mixture. The 

 diffei-ence between this plat and Plat I, treated with 4-4-50 Bordeaux 

 mixture, is, however, vei'v light. A portion of a vine from Plat II, 

 showing the condition of the fruit, is shown in Plate III, Fig. 1, and a 

 portion of a vine from the unsprayed checks, showing the general ap- 

 pearance of the fruit, is shown in Plate III, Fig. 2. The lime sulphur 

 mixtures produced decidedly less satisfactory results than the Bor- 

 deaux. The self-boiled lime-sul])huu, which was prepared Avith hot 

 water, injured the foliage somewhat and the commercial concentrated 

 solution, at the rate of 1 gallon to 50 gallons of water, burned the 

 foliage still more seriously and therefore is unsafe to use in this 

 strength. The results of the treatment with lime-sulphur were so much 

 less satisfactory in this case than in New York experiments in 1908, 

 in which the first application was made Avith Bordeaux mixture, that it 

 throws considerable doubt upon the part played by lime-sulphur in con- 

 trolling the rot in that case. Further experiments are needed to de- 

 termine whether lime-sulphur solutions in any form or strength, in 

 Avhich they can be used, will proA-e a desirable substitute for Bordeaux 

 mixture. The neutral copper acetate solution, 1 lb. to 50 gallons of 

 water, gave better results than any other of the applications except 

 Bordeaux mixture. 



The folloAving account shoAVS the expense of spraying and the gain 

 from Plat II, one-third of an acre, sprayed six times Avith 4-3-50 Bor- 

 deauxj and the estimated gain per acre at the same rate : 



41 



