1918.] DISEASES OF PLANTS. 853 



A fungoid disease attacking pears, I. W. Helmsing {Jour. Agr. [New Zeal.], 

 15 {1917), Xo. 2, pp. 96, 97, figs. 4)- — Entomosporium macitlatiim. causing a 

 disease resembling pear scab {Tenturia pyrina), is briefly described as attack- 

 ing readily the fruits of several varieties of pear and sometimes the young 

 trees in the nursery, causing defoliation with a severe drain on their vitality. 

 Peach, quince, and other orchard trees are also attacked by this fungus. 



Black knot of plum and cherry, R. C. Walton {Mo. Bui. Ohio Sta.. S 

 {191S), Xo. 2, pp. 36-38, figs. 2). — A popular description is given of the charac- 

 teristics of the black knot of plum and cherry due to the fungus Plowriyhtia 

 morbosa, with recommendations as to control measures. 



The anthracnose disease of the raspberry and related plants, W. H. Burk- 

 HOLDEK {Xevj York Cornell Sta. Bui. 395 {1917), pp. 155-183, figs. iO).— A marked 

 decrease in raspberry acreage and yield occurring within the last ten years 

 is attributed principally to several diseases, of which anthracnose is regarded 

 as the most serious. Varietal susceptibility is not prominent within this species. 

 The red raspberries {Ruhus idccus and R. idanis aculeatissimus) are not very 

 susceptible but the black raspberry {R. Occident nlis) is very markedly so. The 

 disease has been shown previously to be caused by Plectodiscella veneta, the 

 perfect form of Glceosporium ven-etum (E. S. R., 33. p. 350; 38, p. 252). An ac- 

 count is given of the life history and the geographic distribution of the fungus, 

 the symptoms on various portions of the host, its morphology and nomenclature, 

 its pathological histologj', its cultural characters, inoculation experiments, 

 effects of weather conditions, and control, which is aided greatly by careful 

 selection. A review of spraying experiments is not uniformly encouraging. 



Ammonium sulphid wash for American gooseberiy imildew, J. V. Eyre 

 and E. S. Salmon {Jour. Bd. Agr. [London], 23 {1917), No. 11, pp. 1098-1100).— 

 This note states that an extensive series of experiments, carried out under 

 glass and in the open air during 1916, has again demonstrated the value of 

 ammonium sulphid as a fungicide as against powdery mildews (Erysiphacese) 

 in general, and in particular the American gooseberry mildew, the results com- 

 pletely corroborating the conclusions from a study previously reported (E. S. 

 R., 35, p. 654). The present communication emphasizes the absolute necessity 

 of including 0.5 per cent soft soap (5 lbs. to 100 gal.) in order to secure thorough 

 wetting of the surface. Directions are given for making up an effective form 

 of this preparation. 



The supposed injury to vines by sulphurous anbydrid, A. Trotter {Riv. 

 Patol. Veg., 9 {1917), No. 1-2, pp. 1-24).— A discussion Is given of the data 

 and views of several investigators regarding the alleged Injury to grapevines 

 by sulphur compounds. 



Anthracnose or black spot of the vine, F. de Castella and C. C. Brittle- 

 bank {Jour. Dcpt. Agr. Virtorin, 15 {1917), No. 7, pp. m-421, figs. 16).— It is 

 stated that after being almost completely absent from vineyards in Victoria 

 for almost 20 years, black spot has reappeared, showing in some localities 

 unusual virulence. A discussion is given of the disease and of preventive 

 measures. 



New disease of the pineapple reported, D. B. IMackie {Philippine Agr. 

 Rev. [English Ed.], 10 {1917), No. 2, p. 150, pi. i).— Mention is made of a dis- 

 ease affecting two varieties of pineapple in the Philippine archipelago. It is 

 characterized by tissue hypertrophy, causing a rough appearance of the fruit. 

 A heart rot of the suckers may be due to the same trouble. The disease is 

 thought to be identical with the one which has proved troublesome in the 

 Hawaiian Islands. 



