244 EXPERIMEXT STATION RECORD. 



the &Dil. Spraying, although generally beneficial to the plant, is not a satisfac- 

 tory remedy for the control of this trouble. Another form of the disease, which 

 makes its appearance during storage and is locally known as braise, is thought 

 to be due to physiological influences. 



The waxt disease of potatoes (Jour. Bd. Agr. [London], 18 {19M), Xo. 8, pp. 

 669, 610. pi. 1\. — The spread of the wart disease or black scab In England is 

 reported, and it is stated that in several places the disease has disappeared dur- 

 ing the year. These areas are supposed to be either ones in which the soil has 

 not become infected or where resistant varieties of jwtatoes have been planted 

 and the fungus has disappeared. It is stated that the hot weather of the past 

 season had no effect in checking the development of the fungus. Some unusual 

 forms of the disease are described, among them the appearance of the warty 

 outgrowths on the stems and leaves. 



A cucumber and melon disease new to Great Britain (Jour. Bd. Agr. [Lon- 

 don], IS (1911), yo. 8, pp. 670, 611, pi. 1; ab». in Gard. Chron., 3. ser., 50 (1911), 

 No. 1301, p. 398). — ^A description is given of the effect of the fungus (ColUto- 

 trichum oligochcelum) on melons, cucximbers. and other cucurbitaceous plants. 

 The disease is said to be prevalent in France and Italy, but hitherto unreported 

 from England. 



Every r'art of the plant is liable to attack, and when the soil becomes infected 

 the young plants are quickly destroyed. On the stem the fungus causes the 

 api)earance of elongated sjxtts of a pale yellowish-green color ; on the leaves, 

 circular siwts, a half inch or more across, at first yellowish-green, later becom- 

 ing brown. The diseased tissue becomes dry but never falls away, as in the 

 case of some other fungus attacks. Upon the fruit the spots occur as deep 

 sunken patches, formed near the tip. The young fruits often die within 2 or 3 

 days after infection and before the sunken plac-es have time to appear. 



Attempts have been made to control this disease, but neither sulphur nor 

 Bordeaux mixture checks it. Spraying with a solution of potassium sulphid 

 arrests its progress, as does also the application of self-boiled lime-sulphur 

 mixture. 



Some observations on the silver-leaf disease of fruit trees, F. T. Bbooks 

 (Rpt. Brit. AsHOc. Adt. Sci., 1910, pp. 116, 111\. — An abstract is given of a 

 paper on investigations on the silver-leaf disease of fruit trees, which prin- 

 cipally attacks plum trees, although it is known to occur on apple and cherry 

 trees and on red currant and gooseberry bushes. The author has reported 

 certain experiments on the propagation of this disease, the principal results 

 of which have been noted elsewhere (E. S. E., 24, p. 451). 



Frost rings on the pear, E. E. Smith (Mo. Weather Rev., 39 (1911), No. 8, 

 p. 1251, fig. 1). — A brief description is given of injury to pears caused by frost. 

 The blemish consists of a scabby ring of surface tissue, which sometimes ex- 

 tends around the pear, or may occur only on one side or part way around the 

 fruit. The eflfeet somewhat resembles that of pear scab, but is easily distin- 

 guished as the fungus is never present. 



Observations during the present season indicated that the ring formed around 

 the pear is a frost effect occurring when the fruit is quite young. The surface 

 tissue of the young fruit is slightly frozen just back of the petals of the flower, 

 and such r*ears are not suflSciently injured to cause them to fall. They con- 

 tinue to develop, but on acx-otmt of the injury to the tissue the fruit is con- 

 stricted at this point. 



Vine diseases in France, F. de Castixla (Jour. Dept. Agr. Victoria, 9 (1911), 

 yos. 6. pp. 30.',-398. figs. 2; 7, pp. .',62-J,68, figs. .',; 9, pp. 651, 652, fig. 1 ; 10, 

 pp. 613-616). — Desc-riptions are given of the principal diseases of grapes in 



