316 



STATE BOARD OF AGRICULTURE. 



The small amoinit of rot on the check plat was, we believe, largely due 

 to the fact that this plat was sprayed in the season of 1907. It would 

 have been better, perhaps, for purposes of comparison, to have used the 

 same check as in 1907. As the amount of rot on a neglected vineyard 

 near by was as great in 1908 as the previous year, there seems to be no 

 reason to suppose that the rot on this unsprayed plat would not have 

 been about as great also, except for the treatment given it in 1907. 



It will be noted that in this experiment the plats sprayed with 4-3-50 

 Bordeaux mixture showed the least amount of rot. The very small pre- 

 centage of rot on all the plats illustrated very clearly what may per- 

 haps be called the cumulative effect of spraying. The disease having 

 been largely brought under control the first season, can generally be 

 much more easily handled succeeding seasons. 



The following is an itemized account of the work showing the gain on 

 plat 3. 



SEVEN SPRAYINGS WITH 4-3-50 BORDEAUX AND ONE WITH 4-2-50, 500 GALLONS IN 



ALL ON .46 ACRE. 



Cost of Labor: 



Man and team to spray 10 hrs. at 35 cents per hour $3 50 



Man and horse to havil Bordeaux mixture 10 hours at 25 cents per hour 2 50 



Two men to carry trailers in last 4 sprayings, 6 hours at 15 cents per hour each 1 80 



Co.sT OF Materials: 



Copper Sulphate, 40 lbs. at 6? cents 2 70 



Stone lime. 30 lbs. at two-thirds cents 20 



Fiye-sevenths tube of gas at ?2.35 per 50 lbs. tube 1 67 



Total cost per .46 acre «12 37 



Cost of spraying one acre 26 90 



Returns: 



Yield on sprayed plat 660 8-lb. baskets at $0.1166 per basket $76 95 



Receipts per acre at same rate $167 29 



Yield on check plat 1,134.75 lbs. at $20.64 per ton $11 71 



Returns per acre at same rate 101 71 



Gain per acre from sprajing ". $65 58 



Cost per acre for spraying 26 90 



Net gain per acre $38 08 



Grapes in same vineyard sprayed 5 times sliowed no appreciable difference in amount of -rot. 

 Difference in net gain this year was duelto extra_sprayings, and less loss on check as result of previous 

 treatment (1907). 



In 1908 spraying experiments were again started in Mr. J. M. Tower's 

 vineyard, near Paw PaAv. This vineyard consisted of Concord vines 

 about 8 years old, with the rows running north and south. Nine plats, 

 .488 of an acre each as nearly uniform in character and condition as 

 possible, were selected. The work was done with the geared traction 

 sprayer shown in Plate IT, Fig. 2. The mixing platform is also shown 

 in the same figure. 



The following mixtures were used: Bordeaux 4-4-50, 4-3-50, 4-2-50, 

 5-5-50, 5-4-50 and 5-3-50, also Sodium Benzoate Bordeaux (1) and (2). 

 Six applications were made as shown in the accompanying tables, the 

 last one consisting of 4-2-50 Bordeaux. 



PLAT I. 



