DISEASES OF PLANTS. 99? 



plants and at the same time supplies one of tlie ingredients necessary 

 for tlie bealtlij^ growth of turnips, etc. 



Treatment of melon diseases, F. A. Waugh {Oklahoma Sta. Btil. 

 15, pp. 30-32, Jig. 1). — Brief notes are given of anthracnose of water- 

 melon, due to CoUetotrichum Undemuihianum. In 1894 experiments 

 were conducted for its repression. Seeds were soaked in Bordeaux 

 mixture and copper carbonate solution before planting, and in a second 

 trial the plaiits were sprayed at different intervals throughout the 

 growing season. The results were wholly negative and the experiments 

 are to be repeated. 



Potato blight and potato scab, F. W. Eane ( West Virginia Sta. 

 Bui. 38, pp. 39-46, Jigs. 5). — A popular bulletin in which potato blight 

 due to Macrosporium solani and potato scab are figured and described. 

 The use of Bordeaux mixture is advised as preventive treatment for 

 the blight and soaking seed potatoes in corrosive sublimate for the 

 prevention of the scab. Notes are given on spraying apparatus and 

 also list of firms making such machines. 



The author tested the effect of barnyard manure and lime on the pro- 

 duction of scab. The most scab was found in the plats receiving the 

 manure, the plat receiving lime gave the next amount, lime and manure 

 Ktill less, and no treatment gave the least amount of scab. All the seed 

 was untreated in this experiment. 



Potato scab, J. Troop {Indiana Sta. Bui. 53, pp. 120-122, Jigs. 2). — 

 The author conducted some experiments to ascertain (1) whether or 

 not the disease is developed more rapidly in muck soil than in sandy 

 loam; (2) whether a single crop of scabbed potatoes will render the 

 soil unfit for a future crop, and (3) the effect of treatment on the yield. 

 The tubers were soaked in a solution of corrosive sublimate, 2 oz. to 16 

 gal. water, for 1, 1.5, and 3 hours. In every case the longer the seeds 

 were soaked the less was the amount of scab. In the case of the muck 

 soil there was a greater amount of scab on both treated and untreated 

 plats than on the upland soil. In the muck the untreated j)lats gave 

 60 to 65 per cent scabbed tubers, as compared with 3.5 to 5.75 per cent 

 for the treated plats. On the upland the amount of scab was reduced 

 to 2 per cent by the treatment. The germs from an infected crop of 

 the previous year materially increased the amount of scab at harvest. 

 Owing to a frost killing some plants the third inquiry was abandoned, 

 as the results were too unreliable for comparison. 



Potato scab and its prevention {loica Sta. Bui. 27, pp. 120-120, 

 Jigs. 3). — Compiled notes are given concerning the cause of potato scab 

 and suggestions are given for its prevention. Experiments were con- 

 ducted to test the relative value of corrosive sublimate, ammoniacal 

 copijer carbonate, potassium sulphid, Bordeaux mixture, ferrous sul- 

 phate, soda hyposulphite, and a sulphur mixture for the prevention of 

 scab. Owing to the season the results obtained were such that no 

 definite conclusions could be drawn, but the corrosive sublimate was 



