46 EXPERIMENT STATION BULLETIN 354 



3-20-50 was applied to certain trees in the third and fourth cover sprays 

 on which Mike sulphur had been tested. Lead was added (3-100) plus 

 lime (3-100) to all spray applications, except that made during f^U bloom. 



Results of Spray Treatments for Scab Control 



Mike Fermate Bordeaux Mixture 



Number of scab spots per leaf 



Percentage apples showing scab 



Percentage apples showing slight 

 or severe russeting 



M. C. Richards 



Bacterial Ring Rot of Potatoes 



Green Mountain potato plants growing in soil previously infested 

 with the bacterial ring rot pathogen did not develop symptoms of ring rot. 

 I'ubers taken from these plants were further tested by planting them in 

 the greenhouse and again ring rot failed to develop. Infected check plants 

 growing nearby showed typical symptoms. Because infection did not occur 

 when the plants were grown in infected soil, it is believed that the ring rot 

 pathogen either does not overwinter in the soil or that infested soil does 

 not serve as a source of inoculum under field conditions in central New 

 Hampshire. 



M. C. Richards, H. R. Barratt 



POULTRY 



Protein Requirements of Chickens at 

 Various Stages of Growth and Development 



As a result of the war emergency and the shortage of animal and ma- 

 rine proteins, increased emphasis has been placed upon vegetable proteins 

 as protein supplements in poultry rations. While some experimental in- 

 formation on the value of all-vegetable-protein rations for growing chicks 

 is available, few experimental data have been obtained on the value of all- 

 vegetable-protein rations for laying pullets. In order to supplement the 

 data previously obtained on proteins for growing chicks, an experiment uti- 

 lizing an all-vegetable-protein ration for laying pullets has been conducted 

 during the year. 



Three pens, each containing 20 pullets of comparable age and sexual 

 development, were started. October 15, 1943. Records of body weight, 

 feed consumption, egg production and mortality were kept by 28-day pe- 

 riods for each type of ration. 



The rations used are presented in Table I. They were fed as mash 

 and grain. Scratch grain was fed in the litter twice daily. 



The mash fed in Pen VII, referred to as the meat-scrap ration, was 

 composed of approximately equal parts of protein from meat scrap and 

 soybean oil meal. This mash corresponds to the type mixed by many feed 



