No. 4, February, 19221 PATHOLOGY 287 



storage failed to show pronounced infection. — Crop rotation is important in control. Re- 

 sistant crops should be grown ujion infested soil for at least 2 successive years. Sanitatioa 

 in the field and packing shed reduces the amount of soil infestation, and clean cultivation, 

 especially the destruction of weeds which harbor the parasite, is advisable. Soil sterilization 

 with various chemicals was tried in 1919 and 1920 without conclusive results, though copper 

 sulphate solution and formaldehyde, both hot and cold, are promising. Bordeaux mixture 

 applied as a drench, crude sulphuric acid followed by lime, cresol, and cyanamid effected 

 little, if any, control. — Of the 3 varieties of lettuce tested under the same conditions. All 

 Heart, a low, flat-headed variety, showed 40 per cent infection; Wonderful, with a medium 

 upright head, showed 16 per cent; and Paris Cos, an upright form, showed 13 per cent infec- 

 tion. It is believed that the differences in amount of infection are explained on the basis 

 of habit of growth. — In part II studies upon cultural and morphological phases are considered. 

 S. minor grows well in ordinary culture media, forming sclerotia in heavy crusts. Sclerotia 

 planted in tumblers of sand in September began germination in March, but normal develop- 

 ment of apothecia occurred only in a cold frame from March to May. The apothecia are 

 smaller, the asci and the ascospores larger, than those of S. libertiana. Apothecia in nature 

 have not been observed by the author. — Direct infection of lettuce leaves by ascospores was 

 not successful, indicating that a preliminary saprophytic development is necessary. — C. R. 

 Orton. 



1877. Dana, B. F. Two new Sclerotinia diseases. Phytopathology 11: 226-228. PL 8. 

 1921. — A leaf blight and fruit rot of Amelanchier cusicJcii has been observed in Washington 

 state. The leaves are attacked and killed early in the spring, conidia of the Monilia type 

 being produced. Later the fruits are attacked, drying up and hanging on the trees until fall. 

 The following spring apothecia of a Sclerotinia are produced in abundance on overwintered 

 fruits under trees where the disease has appeared. This fungus is described as Sclerotinia 

 gregaria n. sp., and is considered the perfect stage of the Monilia which attacks the leaves 

 and fruit. — A very similar disease was found on the young leaves, twigs, and half grown fruits 

 of Prunus demissa. Conidia of the Monilia type were produced in abundance on the leaves 

 and twigs, but none have been found on the fruits. Apothecia developed in early spring on 

 the overwintered fruits on the ground. This fungus is described as Sclerotinia demissa n. sp., 

 and a technical description is appended. The genetic connection of the conidial and the 

 ascigerous stages has not been demonstrated by cultures in either case. — B. B. Higgins. 



1878. Davis, W. H. Mammoth clover rust. Proc. Iowa Acad. Sci. 26: 249-257. 1919- 

 Stages of the rust are described and photographs and line-drawings of spores and sori are 

 given. "The causal organism is probably Uromyces trifolii." — H. S. Conard. 



1879. Fawcett, G. L. La enfermedad de las rayas amarillas de la caiia. [Yellow stripe 

 disease of cane.] Rev. Indust. y Agric. Tucuman 10: 46-48. 1919. — The yellow stripe disease 

 of sugar cane is widel}^ distributed on Java varieties in Tucuman. Variety Kavangire is 

 immune and D 1135 is very resistant. The writer does not consider the disease serious. — 

 John A. Stevenson. 



1880. Gardner, Max W., and James B. Kendrick. Soybean mosaic. Jour. Agric. Res. 

 22: 111-113. PI. 18-19. 1921.— Soybean [Soja Max], variety Hollybrook, was found affected 

 with a typical mosaic disease at Lafayette, Indiana. The disease is communicable by rubbing 

 and by inoculation of wounds with expressed juice. The incubation period varied in the 

 tests from 13 to 37 days. Fruiting of affected plants is greatly reduced, and most of the 

 seeds are rendered sterile. The viable seeds are undersized; such seeds transmit the disease 

 to the extent of 13 per cent. The disease has not been communicated to garden bean [Phaseo- 

 lus vulgaris] nor to cowpca [Vigna sinensis]. — D. Reddick. 



ISSl. Gardner, Max W., and James B. Kendrick. Turnip mosaic. Jour. Agric. Res. 

 22: 123. PI. 20. 1921. — Turnip [Brassica rapa] was found affected with a typical mosaic 

 disease at South Bend, Indiana. The disease is communicable by rubbing and by inoculation 



