Agricultural Research in New Hampshire 51 



Spraying for Apple Scab 



Heavy and frequent rains during April and May, 1945, hastened the 

 discharge of the primary inocukim so that practically all ascospores had 

 been discharged by May 25 as contrasted to the previous year when viable 

 spores of the apple scab fungus were being discharged as late as June 23. 

 As a result of the very wet weather, 1945 promises to be one of the worst 

 scab years experienced by New Hampshire growers. From preliminary 

 tests, Puratized N5-E and Isothan (Ql5) seem to have promise for future 

 use as protective sprays for scab control. In spite of the favorable weather 

 for scab this year, Fermate and micronized sulphur have given good con- 

 trol on Mcintosh and Spy apples when applications were properly timed. 



M. C. Richards 



The Testing of New Pesticides 



This project has been recently set up to determine the fungicidal 

 value of some of the newly developed spray materials for plant disease 

 control under New Hampshire conditions. 



Two applications of Puratized N5-E at 1:10,000 were found to be 

 verv useful for the control of powdery mildew on sweet peas, but was 

 injurious to greenhouse-grown roses. The spray materials Isothan, Fer- 

 mate, Dithane, Spergon, Arasan, and others, are now being tested to de- 

 termine their effectiveness for control of root rots, defoliation diseases of 

 tomatoes, and apple scab. 



M. C. Richards, R. C. Jones 



POULTRY 



Protein Requirements of Chickens 

 At Various Stages of Growth 



The war emergency has limited the supply of animal and marine 

 proteins available. Therefore, emphasis has been placed on utilization 

 of the vegetable protein soybean oil meal as a protein supplement in 

 breeder rations containing no animal protein. 



Following a period of 224 days on test, 20 pullets on a meat scrap 

 ration averaged 69.2 pounds of feed consumed and 131.5 eggs per bird 

 which hatched 82 per cent. Twenty pullets on a soybean oil meal ration 

 averaged 70 pounds of feed consumed, and 132.8 eggs per bird which 

 hatched 76 per cent. There was no mortality in either group and body 

 weight maintenance was satisfactory. 



The results obtained this year with soybean oil meal are more favor- 

 able than those obtained in the past, particularly in regard to hatchability. 

 With increasing information on soybean oil meal, it appears that this pro- 

 tein supplement can be used with reasonably satisfactory results as the 

 only protein supplement in poultry laying and breeding rations. 



Choline has recently been shown to be important in the nutrition 

 of poultry and a relationship established between the amino acids cystine 

 and methionine and the compound choline. Choline can substitute in 



