Feb., 1926] 



PROGRESS OF AGRICULTURAL EXPERIMENTS 



15 



Table III — Effect of maturity of seed on the development of degeneration diseases and 

 -productivity of seed stock in southern New Hampshire 



A. Green Mountain 

 1923 



1924 



Age of stock 



Direct from grower: 

 Strain H 



First grown at East 

 Kingston in 1922: 

 Strain H 90-day . . 



First grown at East 

 Kingston in 1923: 

 Strain H 91-day . . 

 Strain H 103-day. 

 Strain H 127-day . 



Direct from grower: 

 Strain E 



First grown at East 

 Kingston in 1923: 

 Strain E 91-day . . 

 Strain E 103-day . 



Leaf-roll 



Per cent 

 0.50 



0.30 



0.00 



Mosaic 



Per cent 

 0.00 



0.00 



0.00 



Yield 

 per acre 



Bushels 

 378.50 



359.50 



370.90 



Leaf-roll 



Per cent 

 1.37 



7.27 



2.10 

 1.53 



2.77 



0.12 



0.86 

 1.18 



Mosaic 



Per cent 

 0.00 



0.00 



6.09 

 0.00 

 0.00 



0.17 



11.64 

 0.00 



Yield 

 per acre 



Bushels 

 271.7 



286.5 



392.7 

 449.5 

 358.1 



247.0 



395.2 

 368.0 



B. Irish Cobblers 



Spraying Potatoes (Hatch Fund) 



Continuing previous work, a study was made by O. Butler on the 

 effect of pressure and number of nozzles used on the control of late-bHght; 

 but only a slight and irregular infection of the malady had developed in 

 the plots at the time the plants were frosted, and there was not sufficient 

 tuber infection to mark any differences. 



An 8-4-50 Bordeaux mixture applied fortnightly was compared with 

 both a 4-4-50 mixture and a 4-4-50 mixture plus molasses applied weekly. 

 A heavy infection of early blight developed and killed the non-sprayed 

 plots early in September, while the sprayed plants remained green until 

 the close of the season. The mixtures used gave approximately the same 

 degree of control of early bhght as far as the appearance of the foliage 

 was concerned, but the yields obtained were as follows : 



Bushels 

 per acre 



&-4-50 Bordeaux mixture applied every two weeks 347 . 



4-4-50 Bordeaux mixture-molasses applied every week 342 . 4 



4^-50 Bordeaux mixture applied every week 316. 3 



Non-sprayed plants 270. 8 



