The Black-rot of Tiui Grape, and its Control. 



223 



TREATMENT 



PLAT 



1 Bordeaux, 5—5-50; resin sal-soda sticker. 



" 5-5-50; fish-oil soap sticker. . 



2 Same as Mr. Lansing's treatment in 15)06. 

 Same as Mr. Lansing's treatment in 1906. 



3 Bordeaux, 5-5-50; clusters bagged 



" 5-5-50; clusters not bagged.. 



5 

 6 



5-5-50 ; dingers burned 



5-5-50 ; dingers not burned . 



6-6-50 

 6-6-50, 



Total 



weight 



grapes 



5-5-50- 

 5-5-50. 



4-4-50 . 

 4-4-50 • 



8 Check 



Iron sulfate, 5-5-50. 



9 First application, lime and sulphur; others 



Bordeaux 



First application, Cu SO4, solution; others 



Bordeaux 



10 10 Check ro\vs==i Plat , 



lbs. 



2541 



1938 



2494 

 2494 



2298 

 2318 



2403 

 2306 



2543 

 2133 



2988 

 2275 



2853 

 2854 



2217 

 2181 



2416 



2540 

 4360 



Weight 



commercial 



grade 



lbs. 

 21 16 

 1566 



20 ;o 

 2070 



2186 

 1620 



2238 

 2034 



2218 

 2028 



2848 

 21 1 1 



2660 

 2660 



1554 

 1713 



2304 



2010 

 2890 



Weight 

 culls 



lbs. 



425 

 372 



424 

 424 



112 

 698 



165 

 272 



325 



105 



140 

 164 



193 



194 



663 

 470 



112 



530 

 I47I 



Per cent 

 commer- 

 cial 



% 



83 

 76 



83 

 83 



95 



70 



93 

 88 



87 

 95 



94 

 93 



93 

 93 



70 

 78 



95 



79 



66 



Cost and Returns. 



The yield of commercial grapes per acre from an average of four acres 



well sprayed 477o lbs. 



Check 3108 " 



Gain 1 662 lbs. 



at 2 J cents per pound $41.55 



Cost of material and labor for spraying 8 . 60 



Saved per acre $32 . 95 



The season of 1907 was comparatively dry, and not favorable to the 

 development of the disease. In spite of this fact, good results were 

 obtained which show that, when the rot is prevalent to a moderate degree, 

 spraying will completely control it. We see from this table that all 

 sprayed rows had very little rot, whereas the loss in the case of the check 

 rows was 34 per cent and in the case of the check plat 30 per cent to say 

 nothing of the extra labor of handling the poorer grades. Plats 4, 5, 6, 



