232 PATHOLOGY [Bot. Absts. 



1630. Davis, D. J. The effect of potassium iodid on experimental sporotrichosis. Jour. 

 Infect. Diseases 25: 124-131. Fig. 1-2. 1919. — Potassium iodid and iodin have relatively 

 little germicidal effect on Sporolrichum schenkii, the organism surviving for at least 48 hours 

 in a 10 per cent solution of potassium iodid and 74 days or more in a 1 per cent solution. 

 Potassium iodid given to animals for 8 days previous to inoculation with Sporotrichum will 

 have no effect in inhibiting or preventing the infection. On continued treatment the iodid 

 will cure experimental sporotrichosis. It evidently does not act in a direct way on the 

 Sporotrichum. but through the agency of tissue proliferation and processes incidental thereto. 

 — Selman A. Waksman. 



1631. de Castella, F. Vineyard spraying. Jour. Dept. Agric. Victoria 16: 141-156. 

 1918. — Descriptions of spraying machinery for vineyards, drawn largely from the French. — 

 D. Reddick. 



1632. de Castella, F. Copper fungicides for vine disease. Jour. Dept. Agric. Vic- 

 toria 16:592-599, 674-678, 735-737. 1918.— Summary statement on the preparation of cop- 

 per fungicides, particularly of Bordeaux mixture, its chemistry, physical properties, adhe- 

 sion, compatibility, etc/ — D. Reddick. 



1633. de Castella, F. Downy mildew, Plasmopara viticola (B. & C.) B. & deT. Jour. 

 Dept. Agric. Victoria 16: 568-574. 6 fig. 1918. — Downy mildew first appeared in Victoria in 

 1917. The loss from mildew in 1918 in north-east Victoria is over 90 per cent of the crop. 

 Two per cent bordeaux mixture gave excellent control where used. It is thought that two 

 applications of the mixture will give satisfactory results, but considerable space is devoted to 

 an explanation of telluric conditions and epiphytotics. — D. Reddick. 



1634. de Castella, F. Notes on vine black spot or anthracnose. Jour. Dept. Agric. 

 Victoria 16: 420-425. 1918.— Anthracnose has been unusually prevalent and destructive on 

 account of two successive rainy seasons. Sultanas were practically destroyed in some in- 

 stances. — Swabbing the dormant vines (iron sulfate 35 pounds, sulfuric acid 8 pounds, water 

 10 gallons) combined with summer spraying with a copper fungicide is recommended. "On 

 thoroughly swabbed vines a very limited number of sclerotia are capable of germinating 

 when placed in a moist chamber at suitable temperature." — D. Reddick. 



1635. Enfer, V. Le chancre du poirier. [Pear canker.] Revue Horticole 91:217-218. 

 Jan., 1919. — A list of varieties of pears susceptible to canker is given, together with methods 

 of treatment. A canker similar to that of the apple and a list of varieties on which it has 

 been found is mentioned. For the latter disease treatment similar to that for apple canker 

 is detailed, together with the method for preparing and using a bath composed of iron sul- 

 fate, sulfuric acid and water which may be applied to the wounds and infected areas. — E. J . 

 Kraus. 



1636. Farrell, J. Gnarl of the Gravenstein wood, in: Apple culture in Victoria. Jour. 

 Dept. Agric. Victoria 16: 64S-652. PL 178-180. 1918.— "The gnarled wood is produced by 

 the premature hardening of a lengthy section or sections of the cambium, thus preventing 

 sap activity in these parts. Depressions, which run with the length of the affected stem or 

 branch, are thus formed. The free passage of the sap promotes strong growth in the healthy 

 portions, causing elongated protuberances to appear. These depressions, interspersed with 

 the elevations running longitudinally in the surface of the wood, give it a corrugated appear- 

 ance. This peculiar habit of growth, although generally regarded as being exclusively con- 

 fined to the Gravenstein, is occasionally noticed in trees of the Missouri Pippin variety. 

 Gnarl in the latter usually supervenes on variety degeneration and general debility, whereas 

 robust specimens of the former are most liable to its attack. — A high percentage of Graven- 

 stein trees become affected, and the twisting of the wood usually commences early in the 

 life ( f the trees. In many instances, after a few years' growth, the stem is so extensively 

 corrugated, and the sap flow so seriously interrupted, that the whole superstructure col- 



