652 EXPEEIMENT STATION EECOED. [Vol.35 



winter rye and wheat in solutions containing corrosive sublimate as a protection 

 against Pusarium and other fungi. The variety, degree of attack, germinability, 

 grain weight, and fall and spring conditions are noted in the tables given. 



The relation of the seed stock to the control of bean anthracnose and bean 

 blight, J. H. MuNciE {Abs. in Science, n. ser., 43 (1916), No. 1106, p. 365).— On 

 account of the failure of fungicides in the control of these diseases and pending 

 the experiments on the growing of seed for Michigan planting in western States 

 where anthracnose is unimportant, the author recommends the planting of 

 varieties of beans of high productivity, so that the losses in ordinary years will 

 be so decreased as not to be burdensome to the industry. Such a variety, it is 

 said, has been found in the Early Wonder, which matures early and is very 

 productive even under severe disease and weather conditions. 



Angnlar leaf spot of cotton, F. M. Rolfs (South Carolina Sta. Bui. 184 

 (1915), pp. 3-30, pis. 8). — An account is given of an investigation of the an- 

 gular leaf spot of cotton, the first description of which appears to have been 

 given by Atkinson (E. S. R., 3, p. 7). According to the author's investigations, 

 this disease is believed to be common in every cotton-growing State in the 

 Union. 



The disease produces angular spots on the leaves, and blackened areas are 

 formed on the stalks and branches. It also attacks young bolls. Young seed- 

 ling plants usually suffer most severely and in many cases are killed outright. 

 The cause of the disease is said to be Bacterium malvacearum, which survives 

 the winter in and on the seed and also on the lint. Delinting the seed with 

 sulphuric acid or treating the seed with hot water at 72° C. for 18 minutes 

 greatly reduced the number of infected plants. Delinting the seed and spraying 

 the plants six times with Bordeaux mixture resulted in the production of 

 98 per cent of sound plants. This method of treatment would probably be 

 practicable where plants are grown for seed production. 



Anthracnose (Colletotrichum lagenarium) a serious disease of cucurbits, 

 J. J. Taxjbenhaus (Abs. in Science, n. ser., 43 (1916), No. 1106, p. 366). — A pre- 

 liminary report is given of investigations of anthracnose of watermelons, canta- 

 loups, cucumbers, and other cucurbits. These are said to be seriously affected 

 in Delaware, and similar conditions are reported in New Jersey, Maryland, and 

 Virginia. The disease attacks the fruit, particularly in case of the watermelon, 

 and also causes a serious leaf spot and a blight and canker of the vines. The 

 attacks are severest on the watermelon crop in its second successive year. On 

 this account, growers are forced to practice rotations of six years or longer. 



Inoculations have shown that the anthracnose from the watermelon, canta- 

 loup, cucumber, citron, and ornamental gourd is identical, the disease being 

 readily transferred from one host to another. Investigations are said to be in 

 progress to determine the life history of C. lagenarium, its relationship to the 

 various hosts, and to other species of Colletotrichum, especially C. lindemuthi- 

 anum. 



Potato diseases and their control, E. C. Stakman and A. G. Tolaas (Minne- 

 sota Sta. Bui. 158 (1916), pp. 3-41, flgs. 28). — Descriptions are given of a con- 

 siderable number of parasitic and nonparasitic diseases of potato, with sugges- 

 tions for their control. For the leaf diseases, Bordeaux mixture is recommended, 

 while wilt diseases and stem rot may be controlled by roguing fields, by selecting 

 and disinfecting seed, and by rotating crops. Experiments conducted during 

 1914 and 1915 showed that the average yield of potatoes per acre was increased 

 56 bu. in 16 fields by seed selection and disinfection. Spraying experiments 

 which have been carried on for seven years gave an average annual increase 

 of 63 bu. per acre of early potatoes sprayed 3 times with Bordeaux mixture or 

 of late potatoes sprayed 4 times. 



