JtJNE, 1920] PATHOLOGY 393 



2699. Matousciikk. [Rev. of: WiNOB, 0. Stikkelsbaerdraeberen giftig? '1st der 

 Stachelbeermehltau giftig?) (Is gooseberry mildew poisonous?) Medd. fra foren. til Svam- 

 pek. Fremme I. 108-111. 1915.] Zeitschr. Pflanzenkrankh. 29:64. 1919.— No.- //. T. 

 GUssow. 



2700. McCubiuN, W. A. Notes on diseases in 1918. Agric. Gaz. Canada 6:433 136. 

 1919.— Brief notes on diseases in Ontario, as follows: winter injury of apples; petiole infec- 

 tion of Platanus americana by Gnomonia venela; tomato fruit rot caused by Ascochyla ?n., 

 Pyropolyporua ribis affecting red currants; Pelnrgonivm affected with a vasculnr trouble 

 thought to be caused by Verticillium; rot of cucumber fruits caused by Rhizopus nigricam ; 

 girdling of peach trees in the nursery attributed to Sclerotina cinerea; lightning injury to 

 tomatoes; leaf spot of peach caused by Bacterium pruni; silver leaf of plums and peaches 

 possibly due to mite infestation. — D. Reddick. 



2701. Mercier, C. A. The electrification of seeds. Sci. Amer. 120: 142-143. 6 Jig. 

 1919— See Bot. Absts. 4, Entry 104. 



2702. Mercer, W. B., and S. P. Mercer. Smut diseases of barley and oats. Jour. Bd. 

 Agric. [Great Britain] 25: 1486-1493. 3 fig. 1919.— Popular descriptions are given with 

 notes on the life history, prevalence in England, and treatment for control of the following 

 smut diseases: barley, loose smut (Ustilago nuda), and covered smut (Ustilago hordei); and 

 oats, loose smut (Ustilago avenae), and covered smut (Ustilago laevis). Brief mention is 

 made of stinking smut (Tillelia separata) and leaf smut (I'rocystis occidta) of rye. — M. B. 

 McKay. 



2703. McCtjbbin, W. A. Brown rot of stone fruits. Agric. Gaz. Canada 6:429-432. 

 1919. — A census made in 1918 in plum, peach and cherry orchards of southern Ontario of the 

 occurrence of Sclerotinia cinerea and of the lesions caused by it. Apothecial clusters, vary- 

 ing from 1 to 111 cups per cluster, were found on a given date as follows: plum 4.1 clusters 

 per tree; peach 5.1 clusters. At a later date clusters were found in 1 orchard to average 26.3 

 per tree.— Blossom infection occurred in cherries to the extent of 10.2 per cent, in plums, 6.4 

 per cent and peaches, 2.6 per cent. — Twigs aborted by Exoascus deformans were found to 

 harbor the fungus to the extent of 76.5 per cent. Considerable significance is attached to 

 this particularly as the conidia are developed abundantly on such twigs whereas cankers 

 rarely bear conidia.— In the autumn the percentage of plums affected with rot was 7.9. of 

 peaches 2.9 per cent. — The average percentage of rotten plums found on the market was 8 

 per cent and of peaches 8.5 per cent. Dealers reported this as "almost none." — A dusting 

 experiment for the control of rot was without results owing to the small amount of disease 

 present. — D. Reddick. 



2704. Melander, A. L. Dry lime-sulphur as compared to liquid. Better Fruit 14 1 : 10. 

 1919. — The chemistry, value, cost, and convenience of handling of dry lime-sulphur, as com- 

 pared to the liquid form, is considered in a practical way. Unless dry lime-sulphur is boiled, 

 the liquid form is preferable.— A. E. Murneek. 



2705. Miege, Em. La desinfection du sol. [Disinfection of soil.] Ann. Serv. fipiph. 

 5: 83-144. 1918.— Extensive review of the literature of soil disinfection touching the follow- 

 ing points : presence and persistence of animal and plant parasites and of toxins in soil, method 

 of soil contamination, influence of disinfection on soil and parasite and on weeds. Experi- 

 ments were performed at Rennes and at Parame' with a large number of antiseptics and with 

 several different vegetables. Parasites are not named but the poor condition of untreated 

 plots as compared with certain treated ones is attributed to the action of plant and animal 

 parasites. Tables are presented to show the yields from the various plots. It is recognized 

 that the chemicals employed may act as fertilizers as well as disinfectants. — Literature on 

 accessory practices is reviewed and includes disinfection of seed, prevention of recontami- 

 nation, use of resistant varieties, etc. — Theoretical considerations underlying the practice 

 are discussed at length. — D. Reddick. 



