Bacteriology 



Studies on Bovine Mastitis. 



Studies on the diagnosis and control of staphylococcal mastitis have 

 been continued. A practical and efficient method for the diagnosis of this 

 infection has been developed. The staphylococci have been found to be an 

 important cause of mastitis in many New Hampshire dairy herds. Treatment 

 with 2 or 3 infusions of 400 mg. of Aureomycin in an ointment base at 48- 

 hour intervals eliminated the infection in about 65 per cent of the quarters 

 treated. Quarters not cured usually had a history of a long-standing chronic 

 infection. Such quarters were not cured when treated with Pendistrin (peni- 

 cillin and dihydrostreptomycin) or with Terramycin. Studies are being con- 

 tinued on the treatment and control of this type of bovine mastitis. 



L. W. Slanetz, F. E. Allen 



OTHER ACTIVE PROJECTS 



Diagnosis and Control of Vibriosis in New Hampshire Dairy Herds. 



E. Katz 



Botany 



Tomatoes Resistant to Late Blight. 



Late blight killed nearly every tomato plant in New Hampshire in 1951 

 and caused most of the tomatoes to rot. However, a few plants at the Horti- 

 cultural Farm remained green and healthy, and their fruits ripened normally. 

 These were from two small-fruited blight-resistant lines. Crosses between these 

 lines and large-fruited varieties have been made, most of which are sus- 

 ceptible to late blight. However, it is hoped that a large-fruited resistant 

 progeny with desirable horticultural characters will eventually be obtained. 



A. E. Rich 



New Organic Fungicides Give Good Control of Apple Scab 

 and Excellent Fruit Finish. 



Although sulfur is still the most widely used fungicide for the control 

 of apple scab, several new materials have been tested which give better scab 

 control under severe conditions. 



Experiments have shown that Phygon XL is an excellent protectant and 

 that Puratized Agricultural Spray is a very good eradicant. Other materials 

 which gave good protection from scab and which show promise, especially 

 from the standpoint of fruit finish, include Thiram, Crag, and Fungicide 406. 



A. E. Rich 



Composting Aided by Hen Manure and Green Vegetation. 



Plots were continuted, raising corn in four variables: (1) control • — 

 fertilizer only, (2) manure, (3) rotted sawdust. (4) fresh sawdust. The total 

 yield was greatest for the rotted sawdust, which was consistant with the 

 three previous years. However, the differences were not significantly greater. 

 Pot cultures of plants were continued, using various mixtures of hardwood 

 (birch) shavings. The mixtures had been composted in outdoor pits for 



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