38 PATHOLOGY [BoT. Absts., Vol. X, 



dust. Cultural characters of the organism are given. Tests reported show considerable 

 differences in varietal susceptibility. Spraying, seed treatment, and seed selection seemed 

 valueless or impractical as control measures. Three-year old seed gave blight-free plants, 

 as did pod-selected seed. Selection for resistance is considered the most practical method of 

 control. — John A, Elliott. 



222. RoBBiNs, W, W. Mosaic of sugar beets. [Abstract.] Phytopathology 11: 48. 1921. 



223. Slagg, C. M. a new seedling disease of tobacco. [Abstract.] Phytopathology 

 11:49. 1921. 



224. Smith, Erwin F., and G. H. Godfrey. Bacterial wilt of castor bean (Ricinus com- 

 munis L.). Jour. Agric. Res. 21 : 255-261. PL 55-67. 1921. — The disease is caused by Bac- 

 terium solanacearum. It seems to be more prevalent on the alkaline soil of central and west 

 Florida than on the acid soil of the East coast; it is also more prevalent on "new" land than 

 on old. The organism was cultured and infection produced in various known hosts by needle- 

 prick inoculations. Additional hosts are cotton {Gossypium), Vanilla planifolia, sunflower 

 (Helianthus annuus), and Fuchsia sp. [See also Bot. Absts. 1, Entry 362.] — D. Reddick. 



225. TiSDALE, W. B., AND Maud Miller Williamson. Bacterial leaf spot of lima 

 bean. [Abstract.] Phytopathology 11: 52, 1921. 



226. TiSDALE, W. B. Two sclerotium diseases of rice. [Abstract.] Phytopathology 

 11:42. 1921. 



227. Walker, J, C. A Macrosporium rot of onion. [Abstract.] Phytopathology 11: 53. 

 1921. 



ERADICATION AND CONTROL MEASURES 



228. BiSBY, G. R. The cooperative potato spraying project. [Abstract.] Phytopathology 

 11: 60. 1921. 



229. Brock, W. S, Spraying versus dusting in Illinois. Proc. Amer, Soc. Hort. Sci. 

 17: 108-110, 1920 [1921]. — The author states that only 1 orchard was dusted in Illinois in 

 1920 and that none will be dusted in 1921. During the four years of experimental work in 

 Illinois curculio was uniformly controlled in all cases, dusting being superior to spraying. 

 With an average infestation of codling moth for 3 years of 33 per cent on the checks, the 

 average infestation on liquid- and dust-treated trees was 6 and 12 per cent respectively. 

 Dusting has failed to control scab satisfactorily. With a 4-year average of 82 per cent scabby 

 fruit on check trees there was an average infestation of 12 and 41 per cent respectively on 

 sprayed and dusted trees. The author concludes that "there is no experimental evidence 

 to show that dusting with sulphur-arsenate of lead powder will be advisable in Illinois." 

 Extracts were read from communications received from 8 commercial growers in various sec- 

 tions of the state; each grower had discontinued the use of dust. One, however, found it 

 entirely satisfactory for control of curculio, scab, and rot on peaches; another found it effec- 

 tive for the bloom spray on apples, provided the weather was calm ; while a third was interested 

 in having further experimental work done with dusting. — H. W. Richey. 



230. DuDDLESTON, B. H., AND G. N. Hopfer. The improved rag-doll germinator as an 

 aid in controlling root, stalk and ear-rots of corn. [Abstract.] Phj'topathology 11: 33. 

 1921. 



231. GiLMAN, J. C., AND A, T. Erwin. Greenhouse propagation of cabbage resistant 

 to yellows. [Abstract.] Phytopathology 11: 54, 1921. 



232. Hamblin, C. O. Treatment of scab in seed potatoes. Agric, Gaz. New South Wales 

 32:417-419. 2 fig. 1921. 



