752 EXPERIMENT STATION EECOBD. [Vol. 37 



18 a bacillus which is described as differing only in minor respects from 

 Bacillus carotovorus. Other common vegetables are also susceptible to attack 

 by the organism, which is itself very sensitive to antiseptic and germicidal 

 reagents, also to desiccation. 



The development of the aecial stage of Nigredo on red clover, I. E. Melhus 

 and W. DiEHL (Aba. in Phyiopnthology, 7 (1917), No. 1, p. 70). — Experiments 

 have shown that the uretlospore stage of A', fallens developed readily on red 

 clover grown in greenhouses when the plants were about 6 in. tall. Subse- 

 quently, recia were observed, and during a period of about two weeks the 

 fecial stage became abundant and continued to develop for about a month 

 when the temperature of the house was raised by increa.sed sunshine. 



White clover, alsike. and crimson clover in close proximity to the infected 

 red-clover plants remained free from infection. Repeated attempts to transfer 

 the rust to these hosts were without result, and it is believed that N. fallens 

 Is autopcious and not hetercecious a.s heretofore reported. 



The aecial stage of the red-clover rust, W. H. DAvns and A. G. Johnson 

 (Abs. in Phytopathology. 7 (1911). No. 1. p. 75). — The observations and experi- 

 ments of the authors are considered to have shown that the red-clover rust 

 (Dromyces fallens) is a long-cycled, autcecious species, with pycnia, secia, 

 uredinia, and telia on the same host. 



Two transmissible mosaic diseases of cucumbers, I. C. Jagger (Abt. in 

 Phytopathology, 7 {1917), No. 1, p. 61). — The author states that in addition to 

 the mosaic di.soase known as white pickle, which has been previously described 

 (E. S. R., 36, p. 350), a second distinct mosaic disease was observed in the 

 vicinity of Rochester. N. Y. This disea.se is rharaoterl/yed by a mottling of the 

 leaves, but shows no effect on the fruit. It has been repeatedly transmitte<l to 

 healthy plants by rubbing them with rrushed diseased leaves, and has also been 

 transmitted to rauskniolons and to summer crookneck squa.she.s. 



A Gnomonia on eggplant, C. W. Kdgerton (.46.*. in Phytopathology, 7 (/.''/7), 

 No. 1, p. 78). — The author reports having observe<l a species of Gnomonia on 

 old eggplant stems during the winter season at Baton Rouge, La. The fungus 

 has been repeatedly cultured and found similar to, if not Identical with, the 

 fungxis causing eggplant blight (Phyllosticia hortorum). Inoculation experi- 

 ments, however, have always given nepitlve results. While it Is possible that 

 there may be no connection between the two, it is very probable that they are 

 closely related .species. 



A malnutrition disease of the Irish potato and its control. H. A. Edron 

 and O. ScHiu:iNKK {.Aha. in Phytopathology. 7 {1917), No. 1. pp. 70, 77).— The 

 authors report the occurrence, in potato fields from Maine to Virginia during 

 the summer of 1916, of a disease of potatoes characterized by a downward curl- 

 ing of the leaf margins accompanied by a bronzing and later a browning but 

 not a yellowing of the foliage. Death ot the leaves and sudden collap.se of the 

 stems at the ground level followed. F'ungi appeared at and at>ove the point 

 of collapse, but Investigations Indicate that they are only weak parasites acting 

 as contributing factors and that the primary cause of the trouble is malnutri- 

 tion resulting from insuflirient potash or perhaps an excess of nitrates in the 

 presence of a minimum pota.sh supply. In Maine the di.sease appears to be 

 «*orrelated with certain soil type.s and certain varieties, though not entirely so. 

 The use of stable manure was found to be an excellent corrective. 



The economic importance of mosaic of potato, V. A. MuRrnv {Abs. in Phyto- 

 pathology, 7 {1917), No. 1, pp. 72, 75).— As a result of his investigations, the 

 author concludes that in an average crop of 300 bu. per acre there Is a lo.ss of 

 li bu. per acre for every 1 per cent of mosaic present. The eating qualities 

 of potatoes pro<lu<^ed by mosaic plants are said to bo imiuipalred. 



