ANNUAL REPORT, 1936 61 



Biology and Control of Carrot Rust Fly. (W. D. Whitcomb, Waltham.) 

 The field infestation of the carrot rust fly was again light throughout eastern 

 Massachusetts, and the only serious injury reported was in a planting of early 

 carrots where heavy overhead irrigation was used during the oviposition period 

 of the first generation. 



Protection from first-generation injury by seed treatment was again very 

 effectively accomplished at Waltham where the infestation was very light. 

 Pure calomel and calomel diluted 1:3 with clay both gave almost perfect pro- 

 tection, and there was no significant difference between the regular grade of 

 calomel and a special fine grade. 



The field infestation by the second generation at Waltham was about 11 per- 

 cent. One application of naphthalene flakes at the rate of 1 pound to each 100 

 feet of row gave no protection, but continued applications at weekly intervals 

 gave increasingly better protection. From these records, it appeared that three 

 applications at weekly intervals beginning about July 28 were advisable, but 

 that the additional protection from four to five applications was not necessary 



FEED CONTROL SERVICE 

 Philip H. Smith in Charge 



The Feed Control Service comprises not only feed inspection, but several 

 other activities, as listed below: 



Feed Control (General Laws, 1920 Chapter 94) 

 Seed Control (General Laws, 1927 Chapter 94) 

 Dairy Law (General Laws, 1920 Chapter 94) 

 Advanced Registry Testing 

 Miscellaneous Work 



Feed Control. (P. H. Smith, A. F. Spelman, J. W. Kuzmeski, F. A. 

 McLaughlin, J. T. Howard.) During the fiscal year 1,801 samples of feeding 

 stuffs were officially collected and examined in the control laboratories. The 

 gross receipts from the registration of feedings stuffs in 1936 (calendar year) 

 were $22,480, derived from 1,124 brands at $20 each. 



Seed Control. (P. H. Smith, F. A. McLaughlin, Olive M. Hoefle.) From 

 October 1, 1935, to October 1, 1936, the Seed Laboratory analyzed 1,642 samples 

 of seed, of which 850 were collected by the State Commissioner of Agriculture 

 and 589 sent in by dealers and farmers. Tests for viability were also made on 

 203 ingredients found in 43 Special Mixtures. 



