A Container for Carrying Bull Semen. 



All the circuits of the New Hampshire-Vermont Breeding Association are 

 now using the container developed as a result of this project. 



In the near future the New Hampshire-Vermont Breeding Association 

 will be offering service to eight breeds of cattle. Since the semen container 

 holds 12 tubes of semen I later model holds 16 tubes) it means the tech- 

 nicians can carry these 8 breeds and still offer a selection of two series in 

 the major dairy breeds. 



There is no indication that the technicians are doing a better job with 

 the semen container but it does make their job much easier to carry out, is 

 less time consuming, and costs less than any other semen container that is 

 now available. 



H. C. Moore 



OTHER ACTIVE PROJECTS 



The Relation of Seminal Fluid Fructose Levels to 

 Factors Affecting Breeding Efficiency. 



C. H. BOYNTON 



Entomology 



Search for Synergists Continues. 



The increasing resistance of insects to the newer chlorinated insecticides 

 focuses attention on the desirability to attempting to improve some of the 

 older well-known insecticides. Efforts have been continued to increase the 

 insecticidal performance of pyrethrum, rotenone, and nicotine, through the 

 use of synergists. Combinations of pyrethrins and rotenone are known to show 

 synergistic activity when used against the housefly. However, when certain 

 known synergists were used in conjunction with combinations of rotenone 

 and pyrethrins, no increase in insecticidal activity was observed, beyond that 

 which might be expected from the combination of a synergist and these ma- 

 terials, individually. Several additional chemicals were tested for synergistic 

 activity with pyrethrins, but none showed promise in that respect. 



R. L. Blickle, W. J. Morse 



Field Tests with Newer Insecticides. • 



For the second successive year marlate, alone and in combination with 

 lead arsenate, was usually effective and definitely superior to lead arsenate 

 alone or in combination with DDT, for the control of plum curculio. Para- 

 thion with and without safener was slightly inferior to marlate. 



In the control of the European corn borer on canning corn, a 3 percent 

 DDT dust was superior to an activated Ryania dust (Ryanexcel). Best re- 

 sults were obtained when four applications were made at intervals of five 

 to seven days. Under conditions of known infestation, fairly satisfactory re- 

 sults were obtained with a single application, applied when egg hatching was 

 in progress. 



In preliminary cage tests, Aramite dust, Lindane dust, and Genite-EM- 

 923 emulsion controlled the red mite of poultry two weeks after time of 

 application. Caged birds showed no deleterious effects after four weeks ex- 

 posure to the materials used. 



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