June 1941] Agricultural Research in New Hampshire 29 



The Effects of Mulching on the Development of Bitter-Pit in Apples 

 (O. Butler) 



The mulched trees produced fewer apples over 2^ inches than 

 the non-mulched trees, and the total yield of the former was only 92 

 per cent that of the latter. The tabulation below indicates the re- 

 lationship between mulching and bitter-pit, as recorded in this study. 



PER CENT OF BITTER-PIT 



Size of At harvest After 83 days storage 



apples Mulched Non-mulched Mulched Non-mulched 



Over 2Y-z inches 5.05 3.72 ~\ 



[ 29.2 10.4 



Under 2^ inches 1.24 1.03 ) 



(Purnett Fund) 



Effects of Place on Mosaic and Leaf-Roll of the Potato Plant (O. 



Butler) 



A number of cultures were set up in a fertile loam and treated as 

 follows: (1) fertilized with dry cow dung and bone meal; (2) cow 

 dung, bone meal, and acid phosphate; (3) 14 grams 8-16-16 commer- 

 cial fertilizer per pot; (4) same as (3) plus acid phosphate; (5) 21 

 grams 8-16-16 fertilizer per pot; (6) same as (5) plus acid phosphate; 

 (7) acid phosphate alone ; and (8) no treatment. Cultures were also 

 grown in sand with 8-16-16 fertilizer added. 



Masking of mosaic was more complete in the commercial fertil- 

 izer cultures than in the non-fertilized series, or in the series treated 

 with cow dung and bone meal. The addition of acid phosphate, or 

 its use alone, produced no noticeable effects on the masking of symp- 

 toms. No relation was found between rate of growth of plants and 

 masking of symptoms. 



(Purnett Fund) 



Relative Resistance of Peony Varieties to Blight and Control of the 

 Malady (O. Butler) 



In setting out the plot for the study of peony blights and methods 

 of control, varieties have been chosen which, according to Winter's 

 list, show different degrees of susceptibility. The moderately re- 

 sistant varieties are planted in juxtaposition to the susceptible va- 

 riety. Examination of the plants during the season showed that 

 peony blight was present throughout the plot, though irregularly 

 distributed. 



Soil treatments for the control of peony blight were begun dur- 

 ing the year. No conclusions are yet warranted. 



(Hatch Fund) 

 Spraying for Apple Scab (O. Butler and Stuart Dunn) 



During 1940 experiments were continued with flotation sulphur 

 which was used at the rate of 16 pounds of the paste per 100 gallons 

 of water, for the purpose of securing additional data on the control 

 obtained when 3- and 2-cover sprays are used. The trees sprayed with 



