100 PATHOLOGY [Bot. Absts., Vol. V, 



the results of the spraying tests for a period of six years and the rules governing seed certifi- 

 cation in several States are given. — Mel. T. Cook. 



736. Cook, Mel. T. Seed and soil treatment for vegetable diseases. New Jersey Agric. 

 Exp. Sta. Circ. 106. 4 p. 1919. 



737. Cook, Mel. T., and J. P. Helyar. Diseases of grain and forage crops. New Jersey 

 Agric. Exp. Sta. Circ. 102. 16 p. 1918. 



738. Chain, C. C. Warm bath for wheat. Sci. Amer. 121 : 579. 1 fig. 1919.— Popular 

 account is given of treatment for smut. — Chas. H. Otis. 



739. Darnell-Smith, G. P. Dry rot in timber. Australian Forest. Jour. 2: 314-316. 

 1919— See Bot, Absts. 5, Entry 175. 



740. Edson, H. A., and M. Shapovalov. Temperature relations of certain potato-rot 

 and wilt-producing fungi. Jour. Agric. Res. 18: 511-524. 9 fig. 1920. — Single strains of 

 Fusarium coeruleum, F. discolor var. sulphureum, F. eumartii, F. radicicola, F. tricothecioides , 

 and a northern and a southern strain of Verticillium albo-atrum were grown on 2 per cent potato 

 agar without sugar at temperatures ranging from 1° to 40°. Minimum temperature for all 

 forms is around 5°; maximum for F. coeruleum, F. tricothecioides and V. albo-atrum, ("north- 

 ern") 30° or slightly less, for F. oxysporum, about 37°, for F. radicicola about 39°, and for the 

 remaining, slightly under 35°; optimum for F. oxysporum and F. radicicola about 30°; for the 

 remaining about 25°. — A certain degree of correlation exists between the temperature relations 

 of these organisms in pure cultures and their geographical distribution and seasonal occur- 

 rence. This is particularly striking in the case of the 2 wilt-producing fungi, F. oxysporum 

 and V. albo-atrum. — A temperature of about 4° should hold Fusarium tuber rots in check dur- 

 ing storage. The susceptibility of V. albo-atrum to high temperatures suggests the possi- 

 bility of a heat treatment for seed tubers harboring the fungus. — Temperature tests in certain 

 cases may serve as a useful supplementary method for the identification of fungi exhibiting 

 contrasting thermal relationships.— D. Reddick. 



741. Ellis, J. H. The stage of maturity of cutting wheat when affected with black stem 

 rust. Agric. Gaz. Canada 6: 971. 1919.— See Bot. Absts. 5, Entry 20. 



742. Fragoso, Romualdo Gonzalez. Notes and communications at the session of Oct. 

 1, 1919. Bol. R. Soc. Espanola Hist. Nat. 19: 429-430. 1919.— See Bot. Absts. 5, Entry 646. 



743. Fragoso, R. G. Enfermedades del almendro. [Diseases of the almond.] Bol. R. 

 Soc. Espanola Hist. Nat. 19: 458. Oct., 1919. [Review of an article by A. Ballester, pub- 

 lished as a leaflet by Dir. Gen. Agric. Spain, in April, 1919.] The reviewer presents critical 

 discussion of the publication and takes issue with several statements. Clasterosporium 

 carpophilum is reported as a serious parasite, especially in its conidial stage (Corynewn 

 beijerinckii) . The following disease producing species omitted by Fragoso are cited : Puccinia 

 pruni and P. cerasi, Gloeosporium amygdalinum, Fusicoccum amygdali, and Ccrcospora circum- 

 scissa. — 0. E. Jennings. 



744. Gauba, Th. Das Hopfenmissjahr 1918. [An off-year for hops.] Der Bierbrauer 

 46: 161-162. 1918. — Very grave losses (30 to 50 per cent) in Austria, Hungary and Germany 

 occasioned by early attack of hop aphis followed bj r sooty mold and mildew. [Through abstr. 

 of Matouschek in Zeitschr. Pflanzenkr. 29: 193. 1919.] — D. Reddick. 



745. Geschwind, A. Die der Omorikafichte (Picea omarica Pane.) schadlichen Tiere 

 und parasitischen Pilze. [Insect enemies and diseases affecting P. o.] Naturw. Zeitschr. 

 Forst.- und Landw. 16: 387-395. 1918. — Diseases mentioned are caused by Herpotrichia 

 nigra, Lophodermium macrosporum and Trametes pini. 



