box placed in one end that is just 

 large enough on the inside to hold 

 the container, with the lid being on 

 the top of the box. When the con- 

 tainer is removed from the freezing 

 compartment, the copper tubes are 

 filled with cold water for about 30 

 seconds to start the ice melting. The 

 vials holding the semen are placed 

 in the tubes and the container placed 

 in the insulated box. Since the vials 

 are in the copper tubes that are sur- 

 rounded by ice-water, the semen is 

 held at approxmiately the temper- 

 ature of an ice-water mixture as long 

 as there is any ice left in the can. 



Fourteen of the twenty-five cir- 

 cuits of the New Hampshire Breeding 

 Association are using the container. 

 The 60 to 90 day non-returns for the 

 three circuits that used the con- 

 tainer for ten months this year are 

 a slightly better percentage than that 

 of the non-returns for the whole 

 whole Association for the same per- 

 iod. The farmers are getting more 

 selection of bulls because with ther- 



Figure 3. A container developed for carry- 

 ing bull semen by the technician while in 

 the field. 



mos many technicians were carrying 

 only one bull of each breed, while 

 with the container, they can carry 

 semen from two or three bulls of each 

 breed with no particular inconven- 

 ience. 



H. C. Moore 



Entomology 



European Corn Borer Control 



Experiments conducted at Pitts- 

 f/eld, N. H., in the summer of 1949 

 indicate that parathion may be used 

 to replace DDT in late applications 

 for corn borer control on canning 

 corn, thus reducing the residue prob- 

 lem for growers who plan to feed 

 the crop remnants to dairy cattle. 



When a 1 per cent parathion dust 

 was substituted for the usual 3 per 

 cent DDT dust in the third and fourth 

 applications, harvested ears were 94 

 per cent borer free. Moreover, this 

 schedule allowed a lapse of six weeks 

 from the date of last DDT applica- 

 tions to the date of harvesting of can- 

 ning corn. 



The use of commercial DDT emul- 

 sion (Pestroy) in four applications 



at the rate of 1 lb. actual DDT per 

 acre per application, resulted in sat- 

 isfactory borer control, but the spray 

 material caused some chlorisis of the 

 plants. 



In tests on market sweet corn dur- 

 ing the summer of 1950 a 3 per cent 

 DDT dust gave better control of the 

 European corn borer than did a 5 

 per cent dust of organic phosphate. 



J. G. CONKLIN 



R. L. Buckle 



Control of the Plum Curculio on Apple 



In the spring of 1949 Rothane and 

 Compound No. 1189 were compared 

 in tests conducted for plum curculio 

 control. Best results were obtained 

 with Compound No. 1189 (25 per 

 cent wettable powder) at 4 lbs. per 



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