36 PATHOLOGY [Bot. Absts., Vol. IV, 



253. Sanders, J. G., and D. M. DeLong. Dust versus spray for control of some cherry 

 pests in Pennsylvania. Jour. Econ. Entomol. 13: 208-210. 1920. — Pests under consideration 

 were curculio, slug and leaf spot. Materials used were sulphur-arsenate-of-lead dust (90-10), 

 lime-sulphur spray (1-40), lime-sulphur-arsenate-of-lead dust (50-45-5), Bordeaux spray 

 (3-3-50 to 1 pound arsenate of lead). Short discussions with results are given. — A. B. Massey. 



254. Spragg, F. A., and E. E. Down. Rust resisting sunflowers. Michigan Agric. Exp. 

 Sta. Quart. Bull. 2: 128-129. 1 fig. 1920. — Of four varieties of sunflower (Helianthus annuus) 

 cultivated in 1918 for a variety test, a South American variety, Kaeurpher, was nearly rust- 

 resistant, the other three being killed before the close of the season. — E. A. Bessey. 



255. Stevens, H. E. The potato wart disease. Florida State Plant Bd. Quart. Bull. 3: 

 116-120. 1919. 



256. Stirling, Frank. Citrus canker eradication. Florida State Plant Bd. Quart Bull. 

 3:122-123,134-135. 1919. Ibid. 4: 14-15, 35-36. 1920.— Tabular statement of progress of 

 the work of eradicating citrus canker (Pseudomonas citri). — C. D. Sherbakoff. 



257. Strampelli, Nazareno. Esperienze intorno alia carie (Tilletia Caries) del fru- 

 mento. [Experiments with stinking smut in wheat.] Atti R. Accad. Lincei [Roma) Rend. 

 (CI. Sci. Fis. Mat. e Nat.) 28 2 : 151-153. 1919. — Having noticed that different varieties of 

 wheat were differently affected by stinking smut, the author tested the susceptibility of a 

 number of varieties by planting the seed in furrows thoroughly sprinkled with smut spores. 

 The percentage of healthy plants in the different varieties ranged from to 45. The influence 

 of the position of the spores in the soil with relation to the wheat seed was also tested. Only 

 when the spores were in the same soil layer with the wheat did any considerable infection 

 occur. — F. M. Blodgett. 



258. Traverso, G. B. Gelate tardive ed infezione di rogna degli olivi nel 1919. [Late 

 frosts and infection of olives by scab in 1919.] Staz. Sper. Agr. Ital. 52: 463^184. Fig. 1-7. 

 1919. — The author describes the condition of olive plantings of various ages and in various 

 localities in Italy, after a season characterized by late frosts. The organism responsible for 

 the diseased condition is the well-known Bacillus oleae (B. savastanoi), but the extremely 

 severe attacks of the season must be ascribed to the effects of freezing in affording avenues 

 of entrance. The author recommends heavy pruning and treatment with Lotrionte's ferro- 

 calcic mixture (ferrous sulphate 5 kgm., hydrated lime 10 kgm., water 100 1.). Bordeaux mix- 

 ture with the addition of some disinfecting substance such as lysoform, phenol or formalin 

 (1.5-2 per cent) is also recommended. — A. Bonazzi. 



259. Van der Bijl, Paul A. Preliminary studies on some fungi and bacteria responsible 

 for the deterioration of South African sugars. Union of South Africa Dept. Agric. Sci. Bull. 

 12: 1-32. Fig. 1-14. 1920. — A brief characterization is given of fungi isolated from sugar 

 samples; all are able to invert sucrose to some extent, and with one exception grew in solu- 

 tions of 63 Brix concentrations. The resistance of the fungi to disinfectants was also tested. 

 A similar series of experiments was also carried out with a number of bacteria isolated from 

 sugar samples. The ability of these organisms to grow on sugar is largely dependent on the 

 moisture content and temperature of the store-houses and mills. Formalin, chloride of lime 

 and milk of lime appear to be the most suitable disinfectants. — E. M. Doidge. 



260. Weston, William H., Jr. Philippine downy mildew of maize. Jour. Agric. Res. 19: 

 97-122. PI. A and B (col.) and 16-25. 1920. — Disease is prevalent and often very destructive 

 throughout Philippine Islands. Teosinte (Euchlaena luxurians) and sorghum (Andropogon) 

 as well as maize (Zea) are affected, but sorghum is highly resistant. Native, wild grasses 

 have not been found affected — "Symptoms of the disease may appear from the time the plants 

 are seedlings with three or four leaves to the time the tassels and silk are developed. In gen- 

 eral, infected plants show a yellowing of the leaves in more or less restricted striped areas, a 



