DISEASES OF PLANTS. 735 



Bean anthracnose (pp. 152, 153). — This disease, due to the presence of 

 CoUefotrichum lindcmuthUtnum, has been quite common, attacking both 

 bush and pole varieties of beaui^, but being most destructive to the 

 white-podded varieties. The disease is described and the following 

 precautions are given for preventing the spread of the disease: 



"Select good seed, rejecting all beans that seem at all unsonnd. 



"Should the disease apijear in the young beans carefully destroy all affected 

 seedlings. 



'''If convenient spray early with Bordeaux mixture and repeat the application, 

 if needed, before the pods form. 



"Do not jilant on ground that has borne an infected crop the past season. 



"Plant on a dry soil in hills or in rows far enough apart to admit air freely. Hoe 

 when the ground and foliage are dry." 



Tomato anthracnose (pp. 154, 155). — This disease, which caused con- 

 siderable destruction in the station garden, was described in the Annual 

 Eeport of the Delaware Station for 1891, p. 60 (E. S. R., 5, p. 591), as 

 ColJetotrichum Jycojycrsici, but is here called C.phomoides. The disease 

 appears on the ripe or nearly ripe fruit, producing discolored sunken 

 spots with black centers. Successful inoculations have been made, but 

 placing spores on the unbroken epidermis of the tomato failed to pro- 

 duce the disease. A spray of potassium sulphid solution, 7 oz. in 22 

 gal. of water, together with the destruction of all diseased plants and 

 rotation of crops, are the remedies recommended. 



Potato and beet scab (p. 156). — Compiled notes are given showing the 

 identity of these diseases, and the corrosive sublimate treatment is rec- 

 ommended for their prevention. 



Miscellaneous botanical "work, W. A. Buckhout {Pennsylvania 

 Sta. Rpt. 1893, pp. 150-153, pi. 1). — Experiments for preventing potato 

 diseases {p-p. 150-152). — Experiments were conducted with Bordeaux mix- 

 ture for the prevention of potato rot with negative results, no blight or 

 rot appearing on any of the plants. The sprayed plants showed a more 

 vigorous appearance of their tops than the unsprayed. The effect of 

 early planting was tried. Plats were planted April 28 and May 7. 

 There was a marked difference in the appearance of the plants until 

 August, when there was little or no appreciable difference. Owiug to 

 the hot dry weather of midsummer there was no disease present. When 

 harvested the early i:>lat yielded 1,100 lbs, to 882 from the later planted 

 one. These experiments were to have been repeated in 1893 to see if 

 the same results would be secured, but were overlooked. As the rot 

 does not usually appear until late in July the experiment of early plant- 

 ing is to be investigated further. 



Spraying grapes (p. 152). — In 1891 10 varieties of grapes not sprayed 

 were observed, and downy mildew was conspicuous on the Delaware, 

 Brighton, Duchess, Lindley, and Salem varieties. In 1892 the growth 

 of these varieties started very slowly, the Brighton and Duchess vines 

 being nearly dead. Three applications of Bordeaux mixture were given 

 the vines with negative results, there being no mildew that year. In 



