736 



EXPERIMENT STATION RECORD. 



1893 the experiments were repeated with the same results, and the 

 difference between tlie sprayed and unsprayed portions of the rows 

 was indistino'uisliable. A Niagara vine within the si)rayed portion 

 showed some blaclv rot, all others l)eing free from the disease. 

 Unsprayed Concord vines produced a full crop free from disease each 

 year. 



Leaf spot of heet (pj). 152, 153). — This disease, due to Cercospora heti- 

 eolaj was very noticeable. The author thinks spraying would j)robably 

 prevent it, also that the same result would be secured by a rotation of 

 crops, together with a thorough destruction l)y fire of all infected 

 leaves upon the ground whore grown in such a way as to burn the sur- 

 face of the ground slightly, destroying the weeds and accumulated 

 rubbish. The injury to the roots is said to be in a direct ratio to the 

 amount of spotting on the leaves. 



Wheat scab (p. 153). — This disease is reported as having been more 

 or less abundant, but no experiments were conducted for its repression. 



An infection experiment with club root of turnips (finger and 

 toe disease), W. Somerville {Jour. Roy. Agl. Soc. England., ser. 3, 

 5 {1S94), No. 20, pp. 808-811, fig. i).— The author reports on field 

 experiments with lime for the prevention of club root {riasmodiophora 

 hrassicw) of turnips. The turnips were grown in soil that was not 

 infected in small duplicate plats. The infection was secured by adding 

 to each plat 20 lbs. of soil taken from a field known to be badly infested. 

 Finely ground fresh lime was added to the inoculation soil in }, J, 1, 

 and 5 per cent amounts. The lime was ground to such a degree that 

 90 per cent i^assed through a number 100 sieve. The yields given were 

 as follows: 



Soil inoculation experiment with club root. 



The above experiments show the infectious nature of the disease and 

 that it may be greatly reduced by the application of lime to the soil. 

 The author considers an application of about 700 lbs. of finely ground 

 lime equal to an application of 5 tons per acre applied in the usual 

 way. The relative cost and the comparative value of quick and slaked 

 lime are to be subjects for further investigation. 



Attacks of Phoma on growing roots, E. Rostrup {Ztschr. Pffanz- 



enl-mnlc, 4 il8f>4), Xo. l>, pp. 322, 



-The author describes 2 species 



of Phoma that attack root crops of Denmark. The first attacks the 



