252 EXPERIMENT STATION RECORD. 



The appearance of Gloeosporium. fagicolum in Germany, H. Morstatt 

 (Ann. Mycol., 7 (J 909), No. 1, pp. -iS-JiS, figs. 2). — In a park near Geisenheim 

 a leaf spot disease has appeared on the beeches each year with increasing 

 severity. By midsummer the trees are entirely bare of leaves. The spots on 

 the upper surface of the leaves are about 0.5 mm. in diameter, dark brown, 

 with a light yellowish-green border next to the healthy tissue. Later in the 

 center of tbe spots light gi'ay irregular areas appear. As the spots die, they 

 become a ligbt grayish-brown and finally this dead tissue falls out, leaving 

 yellowish-brown bordered holes, oval or irregular in shape. In this manner 

 the entire leaf surface is finally destroyed. 



On the lower surface of the leaves, the appearance of the spots differs but 

 little from that on the upper surface. The brown color is a somewhat lighter 

 shade, more of an olive green, and the light gray areas are slower in ai)pearing. 



The author has determined that the disease is due to G. fugicohim and a 

 description is given of the microscopic characters of the fungus. An examina- 

 tion of beech trees from other portions of Germany indicates that G. fagicohim 

 is more widely disseminated than hitherto supposed. 



Two trunk diseases of the willow oak, H, von Schrenk (Abs. m Science, 

 n. ser., 31 {1910), No. 79-'i, p. J/Sl). — A brief note is given on the attack of 

 willow oak (Qucrcus pheUos) by two polyporoid fungi. 



A trunk disease of the osage orange, II. von Schrenk (Abs. in Science, 

 n. ser., 31 (1910), No. 79.'f, p. ^37). — An account is given of a fungus disense 

 occurring in the heartwood of living trees of the osage orange. Attention is 

 called to the fact that this is the first case reported of a disease of this 

 character, the osage orange having been considered practically immune from 

 fungus diseases. 



Controlling' fung'us diseases, J. B. S. Norton and A. J. Norman (MaryJatid 

 Sta. Bui. J-'i3, pp. 177-215, figs. 8). — This bulletin gives an account of spraying 

 experiments with lime sulphur and other fungicides, comparing their efficiency 

 with that of I'.ordeaux mixture for the control of the diseases of orchard crops, 

 such as peaches, apples, and i)lums. The tests made show that Bordeaux 

 mixture is a better fungicide than any of the others, even though it may cause 

 some injury to the apple fruit and can not be safely applied to tender plants, 

 such as the peach. From the standpoint of safety the self-boiled lime sulphur 

 is less liable to injure the plants than the others. Bordeaux mixture, however, 

 proved most economical, as it gave the largest percentage of marketable fruit. 



In the second part of the bulletin directions are given for the making and 

 api)licatiou of Bordeaux mixture and other fungicides and insecticides, followed 

 by tabular statements regarding different diseases and the best fungicides and 

 insecticides and dates for their application. 



Investigation on the toxic action of Bordeaux mixture, J. B. Dandeno 

 (Rpt. Mich. Acad. Sci., 11 (1909), pp. 30-32).— In continuation of previous in- 

 vestigations (E. S. R.. 21, p. 340) the author has studied the effect of Bordeaux 

 mixture on the seedlings of peas, corn, and lupines. Both the supei-natant liquor 

 of the Bordeaux and the Bordeaux mixture were tested and the effect on the 

 growth of the radicles determined. 



The investigations with the supernatant Bordeaux, limewat-^r. and Bor- 

 deaux mixture showed that the Bordeaux mixture was 4 times as toxic as 

 the superi>atant litpiid. Fresh Bordeaux mixture was found less toxic than 

 that which had stood for a considerable time. As in the previous investigation, 

 the author found that certain dilutions were more toxic than others, corn grow- 

 ing in a solution of supernatant liquid of one-fourth strength, while it would 

 not grow in a one-eighth strength solution. This is explained by the state- 

 ineut that probably more raiiid decomposition goes on in the dilute solutions. 



