No, 2, March, 1921] 



PATHOLOGY 179 



distance of 3200 feet from their source. Similar spores caught at a distance of 3400 feet failed 

 to germinate. Viable sporidia were caught in shrubbery up to a distance of 75 feet from 

 their source and 600 feet in an open meadow. Those caught 2400 feet away failed to germi- 

 nate. Longevity of sporidia is less than 10 minutes with humidity at 90 and temperature 

 of 22-25°C. In other experiments viable sporidia were caught at distance of 180 feet, and 

 those at 300 feet did not germinate. In nine areas where the source of sporidia was localized 

 it was proved that serious infection of pines occurred up to less than 200 feet from the 

 currants. Surgical treatments of diseased pines have shown that where the cut was made 

 at least one and one-half inches back from the visibly affected part, the eradication was 

 successful. — W. H. Rankin. 



1204. Stakman, Louise J. A Helminthosporium disease of wheat and rye. Minnesota 

 Agric. Exp. Sta. Bull. 191:24 p., 5 pi. 1920.— A disease of wheat due to a Helminthosporium 

 causes foot rot in seedlings, and death of the seedlings often results. Secondary infections 

 often occur on any part of the plant, including the seeds, above ground. The common 

 wheat, durum, club, emmer, einkorn, and rye, and many other grasses were found suscep- 

 tible. The organism is carried on the seed and is not destroyed by formaldehyde treatments. 

 Control measures consist in using seed from uninfected fields, and in following good cropping 

 methods.— .4. C. Amy. 



1205. Taubenhaus, J. J. Diseases of greenhouse crops, x + 429 p. 82 pi. Button 

 and Co.: New York City, 1920.— In this book "intended as a guide to practical growers, 

 teachers, students and investigators in plant pathology," the author aims to "bring together 

 available information on the subject and to place it at the disposal of the greenhouse men." 

 Following a statement that the total value of forced plants and flowers, as estimated for 

 1909, was $24,930,000, it is pointed out that a conservative estimate, however, may place 

 these losses (from plant disease) at about 30 per cent.— The book is divided into six parts, 

 under the following heads: (1) The soil, healthy and "sick;" (2) Cultural considerations, 

 in which breaking the rest period of plants is included; (3) Diseases of greenhouse vege- 

 tables (includes also mushrooms); (4) Diseases of ornamentals; (5) Greenhouse pests, under 

 the topics plant pests (red spiders and mites) and thrips (includes also mealy bugs, scale 

 insects, white fly, aphids, soil insects, ants, millipeds, sow bugs, slugs, etc.); (6) Methods of 

 control, in which are outlined methods of preparing insecticides and fungicides, methods of 

 fumigation (with burning sulphur and cyanides) and hygienic considerations. Sections (4) 

 and (5) make up the bulk of the book, and here the diseases are briefly discussed, and litera- 

 ture citations made. The book terminates with a simple glossary of technical words.— 



G. H. Coons. 



• 



1206. Traverso, G. B. La "lebbra" ed il "vaiolo" del Sommaco. [The "lebbra" and 

 the "vaiolo" of the Sumac] Staz. Sper. Agrarie Ital. 52: 213-226. PI. 5 {col.) and 6. 1919. 



1207. Van der Bijl, P. A. A leaf spot of the peanut or monkeynut plant caused by the 

 fungus Septogloeum arachidis Rac. Jour. Dept. Agric. Union of South Africa 1:528-530. 

 Fig. 1-2. 1920.— This disease has been noticed especially along the Natal coast, and occa- 

 sionally becomes sufficiently serious to warrant the application of a protective spray.— 

 E. M. Doidge. 



1208. Waters, R. Take-all disease in wheat. New Zealand Jour. Agric. 20: 137-143. 

 S fig. 1920.— The disease is extremely destructive in Australia, and has evidently been 

 present in New Zealand for some years. The fungus (Ophiobolus graminis) is found upon 

 typically affected plants. Fruiting bodies of the fungus have been identified. Inoculation 

 experiments have not been conducted. Diseased plants usually occur in circular or oval 

 patches. The plants are stunted, more or less bleached, and finally show black masses of 

 the fungus on the underground parts. A similar dwarfing of the plants may be due to crowd- 

 ing by weeds, but in such cases there is no bleaching. Water-logged soil, and the grass grub 

 {Odontriae zealandica) also cause dwarfing, but the presence of the black mycelium of Ophio- 



