DISEASES OF PLANTS. 655 



Potatoes planted upon turnip land that bad not been planted to pota- 

 toes for C years gave a larger total yield of tubers, but tbe crop was 

 practically worthless on account of scab. 



Experiments with siceet potatoes (pp. 319-32S). — Experiments for the 

 prevention of soil rot of sweet potatoes are reported in continuation of 

 those given in tbe Annual Report of the station for 1895 (E. S. Ii., 8, 

 j). 893). Lime, sulphur, manure, corrosive sublimate, kainit, and copper 

 sulphate were tested singly and in different combinations, and as in the 

 previous experiment sulphur gave the best results, followed closely by 

 kainit and copper sulphate and kainit alone. 



Additional experiments are reported on the cost and value of sulphur, 

 when given held trials, as a preventive of soil rot. 



A brief illustrated description is given of the stem rot of sweet 

 potatoes, but no treatment is suggested. 



Experiments with beans (pp. 328-333). — Investigations have been con- 

 tinued on the anthracnose and bacterial disease of beans. Anthracnose 

 was nearly checked by spraying the plants and the occurrence of the 

 bacterial disease was greatly diminished on the sprayed plants. 



The author states that experiments with beans to determine the effect 

 of depth of planting indicate that between 1 and 2 in. is probably the 

 best depth for the variety used (Golden Wax). 



Experiments with tomatoes (pp. 333-330). — Tomatoes were grown for 

 3 years on the same soil. The amount of leaf blight | Septoria lycopersici 

 and Cladosporium fulcum) increased with each succeeding crop, while 

 the fruit rot (Glceosporium phomoides) was about the same for each 

 crop. This seems to indicate that there is some connection between 

 the old tomato plants allowed to remain on the ground and the dis- 

 eased condition of the succeeding crop. The fungicides tested were 

 equally efficient in preventing leaf blight. Irrigation for tomatoes 

 gave negative results this year. 



Experiments ioith peppers (pp. 33C,337). — Experiments designed to test 

 the value of fungicides for the prevention of the fruit anthracnose gave 

 negative results, all being apparently without effect. 



Experiments with eggplants (pp. 337-340). — In continuation of the 

 experiments reported in the Annual lieport of the station for 1895 

 (E. S. E., 8, p. 891) the diseases of eggplants were investigated. The 

 season was very favorable for the development of fungi, and on both 

 sprayed and unsprayed plants only about a third of the fruits were 

 marketable. 



A stem disease appeared that did not seem to be affected by any of 

 the fungicides used. As shown in the previous report, Bordeaux mix- 

 ture reduced the amount of disease where the plants were grown on 

 fresh soil. The growing of 2 successive crops of eggplants on the same 

 soil is believed inadvisable. 



Experiments with cucumbers (pp. 340-344). — After summarizing the 

 results of his previous year's work (E. 8. E., 8, p. 395) the author gives 



