No. 3, April, 1921] PATHOLOGY 289 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



PLANT DISEASE SURVEY (REPORTS OF DISEASE OCCURRENCE AND SEVERITY) 



2017. Clinton, George P. New or unusual plant injuries and diseases found in Con- 

 necticut, 1916-1919. Connecticut [New Haven] Agric. Exp. Sta. Bull. 222. 404-482. 1920. 



2018. Dana, B. F., and Geo. L. Zundel. Head smut of corn and sorghum. Washington 

 [State] Agric. Exp. Sta. Popular Bull. 119. 8 p., 4 fig- 1920.— Reports the first occurrence 

 of head smut (Sphacelotheca reiliana) on corn from Washington. A discussion of symptoms 

 and effects is followed by a comparison of head smut and common smut.— F. D. Heald. 



2019. Petronel, Beni amino. Un interessante parassita del lupino non ancora segnalato 

 in Italia: Blepharospora terrestris (Sherb.) Peyr. [A parasite of lupine newly found in Italy.] 

 Atti R. Accad. Lincei Roma Rendiconti CI. Sci. Fis. Mat. e Nat. V, 29': 194-197. 1920.— A 

 new disease of Lupinus albus, from the vicinity of Lake Regillo, was found to be readily com- 

 municated to healthy plants from diseased plants when both were placed in the same pot 

 in saturated soil. The fungus appeared to be identical with Phytophthora terrestria Sherba- 

 koff. The author places the fungus in the genus Blepharospora, however, because it 

 resembles so closely B. cambivora of Petri, whence Blepharospora terrestris (Sherb.) new 

 comb. — F. M. Blodgeit. 



2020. Sanders, J. G. The European potato wart disease discovered in Pennsylvania. 

 Monthly Bull. California State Commission Hort. 8: 10-12. 1919.— The potato wart disease, 

 (Chrysophhjctis endohioiica) , introduced from Europe, was discovered in Pennsylvania in 1910. 

 The disease manifests itself in the form of warty growths which rapidly multiply until they 

 cover the entire potato. The heavy-celled winter spores resulting from the decay of the 

 infected tuber remain visible and dangerous in soil for at least 6-8 years; control therefore 

 requires a considerable term of years of crop rotation in the absence of potatoes, for it seems 

 the disease attacks only the potato plant. — E. L. Overholser. 



THE PATHOGENE (BIOLOGY, INFECTION PHENOMENA, DISPERSAL) 



2021. DoRAN, Wm. L. The minimum, optimum and maximum temperatures of spore 

 germination in some Uredinales. Phytopath. 9: 391-401. 1 fig. 1919.— Experiments were 

 conducted to determine the critical temperatures for the germination of aeciospores of Gymno- 

 sporangium clavipes, urediniospores of Puccinia antirrhini, teliospores of Puccinia malva- 

 cearum, and urediniospores of Uromyces caryophyllinus . The minimum, optimum, and 

 maximum temperatures (Centigrade) based on the number of spores germinating (listed in 

 the above order) are: 5, 12, and 19; 8, 14, and 25; 9, 16, and 29; 5, 10, and 20; 3, 14, and 30; 

 and 4, 14, and 29 respectively. — J. G. Dickson. 



2022. Drechsler, Charles. Cotyledon infection of cabbage seedlings by Pseudomonas 

 campestris. Phytopath. 9:275-282. 6 fig. 1919.— When cabbage seeds were planted in 

 greenhouse soil heavily infested with the black rot organism, the infection was confined to 

 the region along the sinuses at the margins of the cotyledons. The bacteria invaded through 

 stomata located on the edge of, or a slight distance back of, the sinus. Subsequent progress 

 of the organism is similar to that previously described in older plants by Smith. Cavities 

 develop most rapidly in the stem near the attachment of the cotyledons. No evidence of 

 infection by way of the roots was secured. There was no indication of secretion by the para- 

 site of a soluble toxic substance capable of diffusing for even very slight distances. Gut- 

 tation drops were formed only along the sinuses of the cotyledons; infection was readily 

 secured by inoculation of these drops with the organism. — J. C. Walker. 



