542 EXPERIMENT STATION RECORD. 



anthracnose fungus, CoUetotrichum lagenariuin. has an optimum temperature 

 of 24° and a maximum of 34 to 35°, while the bean anthracnose, C. lindemu- 

 thianum, which has the slowest growth of any of the forms, has for its optimum 

 a temperature of 21 to 28°, and for its maximum 30 to 31°. 



The ascogenous forms of Glomerella are said to be confined to those groups 

 having most rapid growth. The author believes there fire two distinct an- 

 thracnose fungi found on apple in the United States which may be readily 

 separated by their temperature reaction, as well as by other differences. The 

 fact that the bean anthracnose will not tolerate high temperatures may be 

 utilized for control of the disease, .seed being raised in the fall for spring 

 planting. He states that a large number of forms from various hosts falling 

 in the second group mentioned above can not be separate<l by the temperature 

 factor, and it is probable that many should not be considered as distinct. 



The control of cabbage yellows through disease resistance, L. R. Jones 

 and .7. C. Oilman (Wiscomin ,9/o. Research Bui. S8 (1915), pp. 70, figs. 23).— 

 In this bulletin, tlie autliors give an account of the cabbage yellows due to 

 Fiisaritim eonglutituins and also review the experiments carrie<l on for its con- 

 trol by selection of disease-resistant varieties of cabbage, preliminary notes of 

 which have been given (E. S. R.. 33. p. 34G). The disease, its occurrence, 

 spread, method of infection, etc., are <lescribe<l at length, together with early 

 experiments for its control, after which the exiieriments in the selection of 

 disease-resistant strains beg\in in 1910 are discusse<l in considerable detail. 



One strain has been develope<l, which, it is said, will be distributed on a com- 

 mercial scale for planting in 1916. In 1914 it gave a practically perfect stand 

 of heads averaging about .'"»* lbs. each in a total yield of 18 tons per acre on 

 thoroughly cabbage-sick soil, whereas the best commercial strain grown imme- 

 diately alongside it produced 80 per cent of yellows and yielded about 2 tons 

 per acre of heads av«'ragiiig 2* ll)s. each. 



Ring spot of cauliflower, A. V. Osmun and P. J. Anderson {rhyiopathology, 

 5 {1915), No. 5. pp. 260-2G5. figs. Jf). — The authors call attention to the fact 

 that large quantities of caulitlower are shipped from California to eastern 

 markets, and that practically all of this vegetable received from this source In 

 Boston during the latter part of March and early April was badly affected with 

 the disease known in Europe as leaf spot and in Australia as ring spot. No 

 previous record of the occurrence of the fungus in America seems to have 

 been reported. 



The symptoms of the disease, as shown on the material obtained from 

 market, consist of spotting on the outer leaves, although in some cases all the 

 leaves may be infected. In light cases a few spots occur on a leaf, and the 

 leaves show no tendency to turn yellow. On others many spots occur and the 

 leaves lose their green color. Diseased portions, however, retain tlie natural 

 color, which contrasts sharply with the yellow portion of the leaf. 



The disease is said to be caused by }{]/cosph(rrclla hrn.<<.<iicicola, a description 

 of which is given. In Europe the pycnidial stage is formed abundantly on the 

 green leaves while the perithecial stage occm-s only on the old. dying leaves. 

 The perithecial stage is said to be rare in Europe, while in Australia it is com- 

 moner than the other. On the material examined by the authors the perithecial 

 stage was more abundant. 



No control experiments seem to have been reported, and. as this trouble 

 appears to be associated with shipping conditions, it is thought that some 

 change in them might retard the development of the fungus. 



[A disease of cotton], W. I. Howell {Imp. Dcpt. Agr. West Indies, Rpt. Bot. 

 Sta. St. Kitts-Nevis, 1913-14. p. 32). — It is stated that in certain localities on the 

 island of Nevis cotton is affected by a serious disea.se causing a leaf curl on 



