No. 2, March, 1921] PATHOLOGY 175 



1175. BiSBY, G. R., AND A. G. Tola as. Potato diseases in Minnesota. Minnesota 

 Agric. Exp. Sta. Bull. 190. 44 P-, ^7" fifJ- 1920. — The most common potato diseases with 

 control measures are discussed. The use of certified seed and seed plot methods are urged 

 in order to keep up vigor. Soil management and cultural directions are given. Suggestions 

 are also given regarding methods of handling and storing. — A. C. Amy. 



1176. Brandes, E. W. Mosaic disease of corn. Jour. Agric. Res. 19:517-521. PI. 

 95-96. 1920. — Maize {Zea mays) is subject to the same mosaic disease as sugar cane and cer- 

 tain wild grasses. The disease on maize has been noted particularlj' in sugar cane regions 

 of southern United States and in Porto Rico. The symptoms are essentially like those of 

 sugar cane mosaic. Seed production is suppressed. Aphis maydis transmits the "virus." — 

 D. Reddick. 



1177. Cobb, N. A. A newly discovered parasitic nematode (Tylenchus mahogani n. sp.) 

 connected with a disease of the mahogany tree. Jour. Parasitology 6: 188-191. 3 fig. 1920. — 

 Technical description of a new species of nematode parasitic in the tissues of the bark of the 

 mahogany {Sxvietenia mahogani) in the Barbados. — E. A. Bessey. 



117S. Cromwell, R. O. Fusarium blight of the soy bean and the relation of various fac- 

 tors to infection. Nebraska Agric. Exp. Sta. Res. Bull. 14: 1-43. 5 fig. 1919. — Investi- 

 gations carried on in North Carolina and Nebraska. This disease was first reported by author 

 in Jour. Agric. Res. 8: 421-440. The following conclusions were reached: The blight is char- 

 acterized by a chlorosis and shedding of the leaves or leaflets, followed by the death of the 

 plants. Soy bean blight has been observed in several localities within North Carolina on 

 soils infected with cowpea wilt. What is probably the same disease has been recently observed 

 by others in .\labama and possibh' in Wisconsin. Fusarium iracheiphihim (section Elegans) 

 is the causal organism. Cultural and morphological studies which are regarded as of primary 

 importance in distinguishing species of Fusarium show that the strain of Fusarium on soy 

 bean is identical with the organism producing the wilt of cowpeas. Reciprocal inoculation 

 experiments in field and greenhouse with the strains from soy beans and cowpeas show that 

 cross-inoculations can be made. Phj-sical structure and acidity of soil under natural condi- 

 tions are not the limiting factors in infection, but acidity under certain conditions may have 

 some influence. Infection occurs through the roots, but nematodes appear not to increase 

 the percentage of blight materialh^ Other organisms, such as Rhizoctonia and Sclerotium 

 rolfsii, and other root injuries are believed to materially increase the percentage of diseased 

 plants in the field. The Black Eyebrow variety of soy beans shows some evidence of resist- 

 ance. The Brown variety, while not resistant, is tolerant and seems to develop remarkably 

 well in spite of numerous fungous filaments and nematodes within the roots. Fifteen other 

 varieties tested were severely affected. Velvet beans are not subject to infection. — T. A. 

 Kiesselbach. 



1179. Cunningham, G. H. Mortality among stone fruit trees in Central Otago. New 

 Zealand Jour. Agric. 20: 359-364. 1920.— See Bot. Absts. 7, Entry 961. 



1180. Darnell-Smith, G. P. "Bunchy-top" in bananas. Agric. Gaz. New South Wales 

 31:583-584. 1920.— Description of internal lesions of this disease is given. Growers are 

 advised to avoid planting any plants shov/ing such lesions and to destroy growing plants 

 showing bunchy-top characters. The organism responsible, if any, has not been determined. 

 Bacteria have been isolated from diseased tissues, and a Fusarium has been found. It is not 

 known with certainty that the disease is infectious. — L. R. Waldron. 



1181. Dastur, J. F. Choanephora cucurbitarium (B, and Rav.) Thaxter, on chillies 

 (Capsicum spp.). Ann. Bot. 34: 399-403. PI. 19. 1920. — A new disease of chillies is described 

 which caused a considerable amount of damage north of the Ganges, India, in 1917. The 

 characters of the fungus causing the disease are given. — W. P. Fraser. 



