T)74 EXPERIMENT STATION RECORD. 



Its occurrence may lie combated by the use of Bordeaux mixture or a modified Bor- 

 deaux mixture recommended by the author, which consists of water 100 liters, iron 

 sulphate 500 gm., copper sulphate 500 gm., and lime 500 gm. 



A dangerous gooseberry disease introduced into Denmark, E. Rostrcp 

 ( Haven, '/ ( 1904), No. 13, pp. 165, 166). — Notes the occurrence of the gooseberry mil- 

 dew (Sphserotheca mors-uvse) and suggests spraying with potassium sulphid, or pref- 

 erably burning the diseased plants to prevent the spreading of the disease. — p. w. 

 woll. 



White rot of vines [Jour. Bd. Agr. [London], 11 (1904), No. 7, p. 434).— A brief 

 account is given of the white rot of grapes, due to Coniothyrium diplodiella. This 

 fungus attacks vines growing in the open air on the continent of Europe, and has 

 been recently reported as being met with on vines growing under glass in England. 



The fruit is the part most frequently attacked, the fungus spreading throughout 

 the cluster. The foliage is usually unaffected. When once established the disease 

 spreads rapidly and every grape may become affected. When the stalks bearing the 

 grapes are attacked the fungus forms slightly depressed areas of a brownish color, 

 and these may extend along the side of the branches or. may completely girdle the 

 branch, and the injured zone soon dies. In vineyards the disease is most injurious 

 during seasons of great humidity accompanied by high temperature, and under such 

 conditions one-fourth to one-third of the crop may be destroyed within a few hours. 



The best remedy is the removal of all diseased bunches of fruit, and spraying 

 thoroughly at intervals of 5 days with a solution of permanganate of potash. This 

 treatment will usually be found sufficient if the disease is of recent origin, but if it 

 has spread to the branches all such diseased branches should be cut out and burned. 



The oidium of the grapevine, J. Burvenich ( Tijdschr. Plantenziekten, 9 {1903), 

 pp. 61-67). — The writer calls attention to the discovery of Seelig that a 2 per cent 

 solution of sodium carbonate proves an effective remedy against the oidium disease 

 and trbes reports from several growers who had tested the remedy during the past 

 season. 



The conclusion drawn from these reports is that the solution is entirely effective 

 even in a wet year, three sprayings being sufficient to prevent or check the disease. 

 When a 3 per cent solution was used the leaves of the grapevines were seriously 

 injured. — h. m. pieteks. 



A report on "spike" disease of sandalwood, E. J. Butler {Indian Forester, 

 Appendix Ser., 1903, Apr., pp. l-li; abs. in Bot. Cenlbl., 96 {1904), No. 30, pp. 

 88, 89).— A description is given of a diseaseof sandalwood, which the author believes 

 is due to physiological disturbances bringing about a forced carbon assimilation. 

 The diseased trees may be readily recognized by their narrow pointed leaves 

 densely crowded together. The affected shoots do not cease growing, which is in 

 marked contrast to the normal tree which is dormant during a considerable period 

 of each year. The death of the tree often ensues, apparently through "exhaustion 

 and starch poisoning." 



A microscopical examination of the diseased tissues failed to show the presence of 

 any parasitic organism, but there was found an enormous quantity of starch in the 

 parenchymatous tissues, as well as the production of a well-marked palisade tissue 

 which is absent in the normal leaves. It has been shown that similar modifications 

 occur in structures when the plant is compelled to take in excessive quantities of 

 carbon dioxid, and attention is drawn to the similarity of these changes and those 

 causing the spike disease in sandalwood. The disease is said to show marked 

 similarity to the peach yellows of this country, and like it there is reason to believe 

 it is communicable. 



