906 EXPERIMENT STATION RECORD. 



lime and sulphate of copper, each 5 lbs., and water 25 gal., the otlier 

 strengths being n)ade by increasing the amount of water so as to make 

 solutions of one half and one fourth strength. The ammoniacal copper 

 compound for lull strength consisted of 5 oz. of copper carbonate dis- 

 solved in 3 qt. of ammonia and 30 gal. of water. For the weaker solu- 

 tions water was added to secure the one half and one fourth strength. 

 The sprayings were begun on June 21, when the beets were 6 weeks old, 

 and were continued at intervals of 10 days until 10 sprayings had been 

 made. All the ammoniacal solutions were too strong, the foliage being 

 burned wherever they were used. 



The use of Bordeaux mixture caused so striking a difference in the 

 plants as to be readily observed in passing the field. The untreated 

 rows had small foliage, more uj)right and badly spotted leaves, while 

 the sprayed plants showed a rank growth of leaves, nearly green 

 throughout, with much less spot than the untreated plants. The useful- 

 ness of Bordeaux mixture as an insecticide was shown in one instance. 

 The insects, which had been feeding on turnips, invaded the beet field, 

 in some instances stripj)iug the foliage of the untreated rows; those 

 treated with Bordeaux mixture were left free. An increase of nearly 

 26 per cent in weight of plants was secured from the plants on which 

 the Bordeaux mixture had been used, showing that the leaf spot of beet 

 can in a large measure be controlled by the use of this fungicide. 



Beet rust (p. 11). — The beet rust ( Uromyces hetce) has not yet appeared 

 in New Jersey, but the author gives a brief description of it and advises 

 growers to be on the lookout for its appearance. 



White rust of beets (p. 11). — This disease, caused by Cystopus blitii,is 

 mentioned as a possible enemy. Probably the same fungus is not 

 uncommon upon various weeds, Amarantus and the Blitum, spp. ; and 

 such weeds should be destroyed lest they spread the disease to the beet. 



Downy mildeio (p. 13). — This disease, caused hj Peronospora scliaclitHj 

 is briefly described, but it has not yet appeared in this country. 



Further observations upon the effect of soil conditions upon 

 the development of the potato scab, H. J. Wheeler, J. D. To war, 

 and G. M. Tucker {Rhode Island Sta. Bui 30, pp. 66-85, Jigs. 22).— 

 In this bulletin is given a continuation of investigations of the authors, 

 reported in Bulletin 26 of the station (E. S. R., 5, p. 590), on the influ- 

 ence of air-slacked lime upon the development of potato scab. The 

 authors are strongly inclined to question whether the corrosive subli- 

 mate, or any other treatment which does not seriously impair the vitality 

 of the tuber, will destroy all germs on contaminated seed tubers. 



A series of plat experiments was conducted in 1894 to test the effect 

 of the use of lime on the acid soils of the station, the efficiency of the 

 corrosive sublimate treatment, the value of soda as a substitute for 

 potash, and pot experiments to determine the effect, if any, of using 

 other forms of lime than carbonate. 



