54 EXPERIMENT STATION RECORD. 



Combating plant diseases, E. Voges (Dent. Landw. Presse, 36 (1909), Nos. 

 5. pp. ^3, Jf-'t, figs. 7; 6, pp. .54, 55, figs. 2). — A discussion is given of some of tiie 

 pear tree diseases, especially those due to Hendersonia jriricola and PhyUosticta 

 pirina, after which the results of spraying experiments with carbolineum are 

 described. The carbolineum was found to burn the leaves to some extent, and 

 the fungus was found growing iu areas adjoining spots on leaves that had been 

 destroyed by the chemical. 



The author doubts the value of carbolineum as a universal fungicide, and 

 also calls attention to the necessity of thorough and repeated spraying with 

 Bordeaux mixture and other prophylactic measures for keeping the host plants 

 in vigorous condition. 



The use of carbolineum in combating apple and pear scab, K. Huber (Dciit. 

 Obsthaii Ztg., 190S, No. 23-24, pp. 382-387, figs. 4).— The author conducted a 

 series of experiments iu which apple trees were sprayed with carbolineum for 

 the prevention of the apple scab {Fnsicladium dcndriticuni), comparisons being 

 made with similar lots of trees sprayed with Bordeaux mixture. The carbo- 

 lineum was used both as a winter and summer spray, but its value as a fungi- 

 cide was clearly inferior to that of Bordeaux mixture, as was shown by the 

 effects on fruit and foliage. 



Carbolineum as a fungicide, R. Schander {Dent. Landw. Presse, 36 {1909), 

 No. 7, pp. 63, 6-'/. figs. 2). — On account of the claims put forth regarding car- 

 bolineum as an insecticide and fungicide, the author conducted a series of experi- 

 ments using the chemical as a winter wash and as a summer spray for the 

 control of apple seal), comparisons being made with trees sprayed with a 2 per 

 cent Bordeaux mixture. 



Four varieties of trees were sprayed and an equal number of fruits was 

 gathered from each tree and examined for diseased spots. In every instance 

 the least disease was found on the fruits from the trees which had been 

 sprayed with Bordeaux mixture and the greatest number where the spraying 

 had been done with i per cent carbolineum. The percentage of spotted apples 

 in the plats receiving carbolineum exceeded in nearly every instance that from 

 unsprayed trees. 



Tenax, a fungicide for conabating Peronospora (Weiiibait u. Weinha>idel., 

 26 {1908). No. 20, pp. 193, 1 9-'/). — An account is given of some experiments show- 

 ing the value of Tenax, a trade preparation, as a fungicide. This substance is 

 said to consist of copper sulphate, clay treated with sulphuric acid, and soda in 

 about equal proportions. A 1 per cent solution of this mixture is recommended 

 for use against all kinds of downy mildew, and from the experiments described 

 it appears to be more adhesive than either Bordeaux mixture or soda Bordeaux 

 mixture. It is also claimed to be cheaper, more easily prepared, and fully as 

 efficient as either of the above fungicides. 



A new product for use in the control of fungus diseases, Biiisine {Engrais, 

 24 {1909), No. 13, pp. 355-357). — Attention is called to cupric oxychlorid. a 

 product made by electrolytic methods, which the author states is of superior 

 value as a fungicide. It is claimed that it is cheaper than copper sulphate and 

 can be used in much greater dilutions; consequently a decided saving could be 

 made by its use, if the claims made for it are substantiated. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



The Nevada mouse plague of 1907-8, S. E. Piper ( U. S. Dept. Agr., Farm- 

 ers' Bill. 352, pp. 23, figs. 9). — This gives an account of the recent mouse plague 

 in Humboldt Valley, Nevada. The mouse implicated, locally known as the 

 black mouse, proved to be the Carson field mouse {Microtus montanus) . "By 



