50 EXPERIMENT STATION RECORD. 



Rang-pur tobacco wilt, C. M. Hutchinson (Mem. Dept. Agr. India, Bad. 

 Ser., 1 (1913), No. 2, pp. 67-84, pis. 12).— The wilting of tobacco plants, due to 

 infection with a bacterium similar to Bacillus solanacearum, is said to occur 

 annually in the Rangpur district of Bengal. It is thought that the infecting 

 organism is probably unable to gain entrance into the plant except through the 

 intervention of some mechanical injury or of organisms such as nematodes, 

 which bore into the roots of the plant. 



For the control of the disease attempts should be made to conserve the soil 

 moisture and develop the root system so as to produce a better and more rapid 

 growth. All diseased plants should be removed and burned, and the use of 

 alkaline manures should be avoided as much as possible. 



Diseases of the tomato in Louisiana, C. W. Edgeeton and C. C. Moeeland 

 {Louisiana Stas. Bui. 142, pp. 23, figs. S). — There are said to be ten diseases of 

 tomatoes known in Louisiana as follows: Tomato wilt (Fusarium lycopersici) , 

 early blight (Alternaria solani), Sclerotium wilt disease (S. rolfsii), root knot 

 (Heterodera radicicola), blossom end rot, leaf mold (Cladosponum fulvum), 

 anthrticnose {Oloeosporium fructigenum) , southern tomato blight i Bacterium 

 solamacearum) , leaf curl, and damping off (Rhizoctonia sp.). These diseases 

 are described at some length and means are suggested for their prevention, as 

 far as any are known. 



In connection with the wilt the author states that some wilt resistant 

 varieties have been developed at the station at Baton Rouge, and seed of these 

 is to be distributed for further trial in the State. 



Apple leaf spot (Jour. Bd. Agr. [London], 20 (1913), No. 6, pp. 513-515, 

 pi. 1). — ^A description is given of the apple leaf spot due to 8ph<Bropsis malorum, 

 which, it is said, has only recently been reported in Great Britain, although in 

 all probability it has been present for a considerable time and has been over- 

 looked or confused with other diseases. 



Peach leaf curl fungus: Further tests with copper compounds, G. Quinn 

 {Jour. Dept. Agr. So. Aust., 17 {1913), No. 1, pp. 28-32).— In 1910 a series of 

 spraying tests for the control of the peach leaf cucl fungus {Exoascus defor- 

 mans) was reported (E. S. R., 26, p. 144). In 1911 the treatment as planned 

 was not carried out, but it was repeated in 1912, and an account is given of the 

 results. The spraying compounds used were Bordeaux mixture. Burgundy mix- 

 ture, Woburn Bordeaux mixture, copper sulphate solution, and Bordeaux 

 powder. 



As a result of the two seasons' trials, Burgundy mixture is deemed well 

 adapted to the control of the peach leaf curl. When applied twice during the 

 season ordinary Bordeaux mixture was very efficient, and a single season's 

 trial has given similar results with the Woburn Bordeaux mixture. Copper 

 sulphate solution, while giving good results in 1910, proved almost a failure in 

 1912, so far as the control of the disease was concerned. The Bordeaux powder 

 seems to be promising, but the results of 1 and 2 applications are said to be 

 contradictory. 



Comparative experiments with sprays against leaf cast of grape, A. 

 Bretschneidee {Ztschr. Landic. Versuchsw. Osterr., 16 {1913), No. 6, pp. 718- 

 725).— Giving the results of recent experiments with means of combating 

 Peronospora viticola, the author sums up the results of his studies during about 

 four years (E. S. R., 27, p. 652) by stating that besides Bordeaux mixture some 

 commercial preparations have been found entirely satisfactory and a few others 

 named measurably so, while still others mentioned as on trial seem to promise 

 good results. 



A disease of cacao trees due to Lasiodiplodia theobromae, P. Beethault 

 {Bui. Trimest. Soc. Mycol. France, 29 {1913), No. 3, pp. 359-361; Agron. Colon., 



