62 MASS. EXPERIMENT STATION BULLETIN 293 



in the amount of rot showed a direct relation to the number of applications of the 

 spray. The two mercurial sprays used gave as good control of fungous rots as 

 the Bordeaux. 



Storage Test of Cranberries. (H. F. Bergman, W. E. Truran, and Jos. L. 

 Keiley.) Berries were stored in the basement of the State Bog building, at air 

 temperature, which on November 1 was about 15° C, and later dropped to about 

 5° C. Cranberries from sprayed plots showed less loss from fungous rots than 

 those from unsprayed plots. In the berries from two of the bogs this difference 

 did not become apparent until about January. 



COOPERATIVE TOBACCO INVESTIGATIONS 



Conducted by the Bureau of Plant Industry, United States Department 

 of Agriculture, in Cooperation with the Massachusetts Agricultural 

 Experiment Station. 



C. V. Kightlinger, U. S. D. A., in Charge 

 Black Root -Rot. (C. V. Kightlinger.) In continuation experiments numer- 

 ous strains of Havana Seed tobacco were grown in the field during 1931 in a further 

 attempt to find strains that will be satisfactory under Connecticut Valley condi- 

 tions for resistance to black root-rot, type of plant, type and quality of leaf, and 

 producing capacity. One strain was Havana Seed of the sort that is grown more 

 commonly in the Connecticut Valley, known to be susceptible to black root-rot, 

 but acceptable for type of plant and type and quality of leaf. This strain was 

 used as a standard of comparison for types. One strain was Havana Seed 142A3, 

 known to be satisfactorily resistant to black root-rot, and was used as a standard 

 of comparison for resistance. Of the new strains being tested, eight had been 

 grown in 1930, and seven were grown for the first time in 1931. These strains 

 were all grown on land which in one case was free or nearly free of Thielavia 

 basicola, and in another case was heavily infested with Thielavia basicola. Of the 

 fifteen new strains tested in 1931 under these circumstances, eight were selected 

 as apparently deserving further testing. 



The production of these eight strains when grown on soil free or nearly free 

 of Thielavia basicola, was as follows: 



The production of these same eight strains when grown on soil heavily infested 

 with Thielavia basicola, with each strain having its own check of common Havana 

 grown in adjacent rows, was as follows: 



