DISEASES OF PLANTS, 347 



dition to attaokinc; the cIovit. potatoes, strawberries, onions, and oats are subject 

 to infestation. 



Where crops show signs of disease, applications of sulphate of potash are rec- 

 oniniended, and where practicable the sterilization of the soil by the use of gas 

 lime is advised. The removal and burning of infested material will greatly aid 

 in preventing the spread of the disease. 



Cotton anthracnose and cotton rust, A. C. Lewis (Ga. Bd. Ent. Bui. 2//, pp. 

 Ji9-ll, p(js. 8). — A description is given of the anthracnose of cotton caused by 

 CollctotricJiuiu f/os.sijpii, and the relation of certain insects to the disease is dis- 

 cussed. It is believed by many that a number of insects, such as the green 

 soldier bug. the cotton leaf bug, and others, by puncturing the bolls cause the 

 disease, but in the author's opinion there is no relation between the insect punc- 

 ture and the anthracnose, aside from the possibility of spreading the disease by 

 insects visiting from boll to boll. 



Among remedies suggested for the prevention of anthracnose the author dis- 

 cusses resistant plants, resistant- varieties, the rotation of crops, and treatment 

 of seed before planting. 



The red rust, black rust, angular leaf spot, etc., are briefly discussed. 



The root rot of sugar beets, W. Busse, L. Peters, and F. C. von Faber {Mitt. 

 K. Biol. Aiist. Land u. Forstiv., 1907, No. 4, PP- 15-18). — As a result of experi- 

 ments the authors recognize three causes of root rot of sugar beets, namely, 

 Pythiiini deharyanum, Phoiiia beta', and Aphanomyces kcvis, and they think it 

 very improbable that My.roDiouas hetw is the cause. 



Experiments were conducted to prevent root rot by treating the seed with 

 solutions of calcium carbonate and Bordeaux mixture and by soil treatment 

 with slaked and quick lime. The results obtained with the carbonate of lime 

 do nor warrant its further trial. Bordeaux mixture gave favorable results, and 

 the experiments in soil treatment are to be continued. 



A pustule scab of beets, W. Busse and F. C. von Faber (Mitt. K. Biol. Anst. 

 Land ii. Forstir., 1007, No. Jf, pp. 18-20, fig. 1). — A brief description is given of 

 a form of scab occurring on sugar beets in northern and central Germany, the 

 cause of which is said to be Bacterium scabicijcnuni n. sp. A previous report 

 of this disease has been noted (E. S. R., 18, p. 948). 



Black rot of cabbages and turnips {Jour. Bd. Ayr. [London], IJf {1907), No. 

 Jf, pp. 228, 229, py. 1). — An account is given of the black rot of cabbages and 

 turnips due to Pscudonionas campestris, and it is stated that in England rape 

 appears to be most susceptible to the disease. 



In an extensive trial plat with various kinds of cabbage, Brussels sprouts, 

 etc., those strains which are related to rape were first attacked, while those 

 without this relationship were the last to succumb. 



Attention is called to the investigations carried on at the New York State 

 Station (E. S. R., 16, p. 480), which showed that the disease might be carried 

 through infected seeds, and as a precautionai\y measure It is recommended that 

 all cabbage seeds be disinfected by soaking them for 15 minutes in a solution 

 consisting of 1 part of corrosive sublimate to 1,000 parts of water, or 1 lb. of 

 formalin to ?>0 gal. of water. 



Crown gall {Oklahoma >S'/fl. R/it. 1907, pp. 2-'i-2G). — A popular account of the 

 crown gall, which attacks apples, pears, peaches, apricots, and other fruit trees. 

 A warning is given against the jtlanting of infested stock. 



Cedar apples (Gymnosporangium macropus), F. D. Heald {Science, n. ser., 

 26 {1907), No. 6.59, pp. 219, 2,20).— During the past few years cedar rust has 

 increased in abundance and severity in Nebraska and adjacent States, threaten- 

 ing the life of cedars in many places where they are used as wind-breaks about 

 orchards. In many localities the cedars are considered very valuable and assist- 



