DISEASES OF PLANTS. 351 



The destruction of troublesome cruciferous plants, A. YiLCfXi (Join-. Sac. 

 Ayr. Bruhant-Hamaut, 1899, jyp. 718, 719). 



Destruction of charlock by spraying with solutions of iron and copper 

 sulphate, C. Journee {Agronome, 1899, pp. 435, 4S6). 



The destruction of thistles and charlock by ammonium sulphate, G. 

 Castel-Deletrez (Jour. Roy. Soc. Agr. L' Est Bdg., 1899, p. 199). 



Charlock spraying {Ann. Rpt. Field E.t:pts. Irish Agr. Organization Soc, 1 {1899), 

 pp. 43-46) . — Results uf spraying experiments with iron and copper sulphate solutions 

 for the destruction of charlock in barley fields are given. A solution of copper sul- 

 phate, 3 or 4 per cent, at the rate of 40 gal. per acre gave the best results. Stronger 

 solutions injured the barley to some extent. Dock and thistles were injured, but 

 not killed by the spray. 



Recent experiments in combating charlock, L. Grandeau (/our, Agr. Prat., 

 1900, 1, No. 15, pp. 525-527). — A 12.5 per cent solution of iron sulphate sprayed over 

 weed-infested crops at the rate of about 200 liters per acre is said to destroy charlock, 

 mustard, wall flower, and ground ivy, without injury to cereals, clovers, colza, and 

 lupines. 



Combating field mustard, T. Ritter von Weinzierl (Ph?;. K. K. Samen-Control- 

 Sta. Wieii, No. 199, pp. 1-3). — Recommends spraying fields with a 15 per cent solution 

 of iron sulphate at the rate of 40 to 50 gal. per acre. 



DISEASES OF PLANTS. 



Report of the botanist, B. D. Halsted {N'ew Jersey Stas. Rpt. 

 1899., pp. 323-Ji,19, jigs. 16). — The principal lines of experimentation 

 reported npon are investigations on truck ci'ops, of which tnrnips, 

 potatoes, beans, tomatoes, and egg-plants have been foremost. The 

 soil treatments for club-rooted turnips and scabby potatoes and beets 

 have been continued, while the spra3^ing experiments of the station 

 were confined to Bordeaux mixture and soda-Bordeaux mixture. 



Soil fungicides for j)otato and turnij) diseases (pp. 326-367). — In 

 continuation of the experiments reported previousl}^ (E. S. R., 11, 

 p. 751), the author reviews 6 years' experiments with potatoes in which 

 was sought the means foi' the prevention of the potato scab. Differ- 

 ences are noted in the susceptibility of different \'arieties to this disease, 

 and in the experiments conducted the author states that sulphur gave 

 the best results, although the showing for this season was not very 

 striking. An investigation was conducted in this connection to deter- 

 mine the susceptibility of other plants to these diseases, in which 9 

 species of plants belonging to the same botanical order as the potato 

 and a number of other plants were grown on infested soil. With the 

 exception of the radishes, beets, and potatoes, no scab was noted. 

 Experiments on soil inoculation with the potato-scab fungus showed 

 that the steam heating of potatoes for 20 minutes destroyed the fungus 

 onl}' to a limited extent, while there was almost entire absence of scab 

 where the tubers were fed to cattle and the manure placed upon the 

 land where potatoes were grown. 



Experiments with soil rot of sweet potatoes (E. S. R., 11, p. 753) 

 indicate that 300 or 400 lbs. of sulphur and kainit per acre will give 



