1916] DISEASES OP PLANTS. 149 



authors herein give attention to R. napi and R. destruens, said to be of some 

 economic importance in India. They also give a further discussion of the host 

 relations as noted in India of R. solani, thouglit to be identical witli R. 

 medicaginis, and those of Rhizoctonia sp., said to have as its perfect stage 

 Corticiiim vagum. The experiments and views of several authors are cited as 

 regards the control of Rliizoctonia disease of economic plants. 



Tests of spraying compounds {Jour. Agr. INeio Zeal.], 10 {1915), No. 1, pp. 

 SS-J/O). — Besides reports on tests with insecticides, results are given of trials 

 made with several brands of fungicides by growers in cooperation with orchard 

 instructors and managers of experiment farms in different districts of New 

 Zealand. The discrepancies observed in the values are thought to be partly 

 accounted for by regional and seasonable differences. 



Tests of spraying' compounds: Lime sulphur, T. W. Kirk {Jour. Agr. [New 

 Zeal.'], 11 {1915), No. 2, pp. 129-134). — Reporting on a continuation of the spray- 

 ing tests noted above, the author states that as first used lime sulphur of 

 American brands was found to do immense damage by scorching. Subsequent 

 tests with modified strengths have shown its adaptability to local conditions, so 

 that by its adoption a considerable reduction may be effected in the employment 

 of Bordeaux mixture, which is found to produce a russeting effect on the fruit. 

 A formula is given for a homemade solution of lime sulphur which is claimed to 

 be as effective as the commercial preparation and less expensive. Results are 

 given following tests of several brands as carried out in the Hawke's Bay dis- 

 trict and reported by J. A. Campbell. Further tests are noted below. 



Tests of spraying compounds: Lim.e sulphur, G. Steatfoed {Jour. Agr. 

 [New Zeal.], 11 {1915), No. 3, pp. 2^3-2^7).— In continuation of the above re- 

 ports, an account is given of the work as carried out in the Nelson district. 

 The four brands of lime sulphur employed are regarded as effective fungicides, 

 and it is thought that this preparation may largely take the place of Bordeaux 

 mixture, which in this district also produces a russeting of the fruit. 



As regards powdery mildew, which is said to be gradually increasing in 

 almost all districts, lime sulphur is considered to be the only spray which can 

 combat it successfully. 



Disinfection of seed grain with hot water, H. M. Quanjee {Ontsmetting van 

 Zaaigranen met Meet Water. The Hague: Dir. Landhouw, 19 H, 2. rev. ed., pp. 

 18, pi. 1). — This is a discussion of several cereal diseases which may be intro- 

 duced with the seed grain, those diseases control of which is possible or practi- 

 cable, the suitability in particular of the hot-water treatment, its mode of appli- 

 cation, and the expense connected therewith. 



Review of measures taken in the Netherlands for ccaatrol of grain and 

 grass smut, and streak disease, H. M. Quanjer and J. O. Botjes {Meded. 

 Rijks Hoogere Land, Tuin en Boschbouivsch. [Wageningen], 8 {1915), No. 3, pp. 

 129-160, pis. 3). — This contribution, besides discussing the results of previous 

 tests by other investigators and referring to the work of Quanjer (E. S. R., 30, 

 p. 241 ) , gives results of work by Quanjer on smut control and by Botjes on the 

 sensitivity of various grains to copper sulphate and hot water. The latter 

 treatment appears to be generally preferable, both on account of its results and 

 because machinery for its cooperative employment is often already available in 

 the appliances of dairy and laundry plants, the latter offering especial advan- 

 tages as regards the drying of the grain after treatment so that it can be 

 quickly sown. 



The hastening of germination by both the hot water and the copper sulphate 

 treatment is to be made the subject of further study and report. 



Mildew of cereals in France, G. Gaudot {Jour. Agr. Prat., n. ser., 28 {1915), 

 No. 54, pp. 520-522, figs. 2). — This is a brief account of a report by Arnaud 



