234 EXPERIMENT STATION RECORD. 



Dodder on garden vegetables, l^. D. ?Ialstkd (Harden and Forest, 9{189G), No. 446, 

 pp. 365, 30G, 1)1, 1). — Notes are giveu on a species of Ciisuuta growing ou ouions and 

 egg plants. 



An attempt to combat dodder and Rhizoctonia of alfalfa, L. Degrully ( Pro(j. 

 Agr. et TU., ..'I'l {ISDG), No. 31, p. 115). — The use of crude ammonia is recommended. 



Weeds in our fields, W. M. Hays {Minnesota Sta. Bui. 46, pp. 37S-S83, pls.2).— 

 Notes are given on the occiUTence, methods of distribution, and habits of the foxtail 

 grasses (Setaria i^h-idis a.ndS. glauca), lamb's-quarters {Ctienopodinm album), pigweed 

 (Amarantus retroftexiis), yellow mustard {Brassica sinapistrum), and wild oats {Avcna 

 fatiia), and methods are suggested for their eradication. 



Notes on compass plants, E. J. Hill (Garden and Forest, 9 (1806), No. 450. pp. 

 407, 408). 



The cocklebur, J. H. Maiden (Agl. Gaz. N. 8. Wales, 7 (1896), No. 7, pp. 421-423, 

 pi. 1). — Notes are giveu on Nanthium. sirumariuni. 



The weeds of New South Wales, ,J. H. Maidkn (Agl. Gaz. N. S. Wales, 7 (1896), 

 No. 7, pp. 428, 429). — Supplementary notes are given of Melilotus parviflora, Conium 

 mavulatum, Xanthiiim strumarium, Amarantns panictilatus, and A. frunieniaceous. 



DISEASES OF PLANTS. 



Potato diseases on Long Island in the season of 1895, F. C. 



Stewakt {Xav York State Sta. Bui. 101, n. ser., pp. 70-86). 



Synopsis. — General observations are given of potato diseases, together with notes on 

 spraying potatoes, on internal browning of potatoes, a new stem blight, pimply 

 potatoes, and a new Fusarinm ou potato stems. 



The most troublesome diseases are the early and late blijjlits which 

 the author states may be controlled by spraying the plants 5 or 6 times 

 with Bordeaux mixture, beginning when they are about G in. high and 

 repeating the application every 2 weeks. Experiments are quoted show- 

 ing a gam of 02 bn. per acre where the plants had been sprayed 5 times, 

 and 52 bu. where 3 applications were given them. In spraying the 

 plants Paris green may be added to the Bordeaux mixture, the com- 

 bination being more efficient than either when used alone against potato 

 bugs and Ilea beetles. 



The internal browning of the tubers which has been reported in 

 Minnesota ' was observed upon Long Island in 1894. The cause of the 

 disease is thought to be physiological, as all attempts to cultivate any 

 organism or to inoculate sound tubers failed. There are thought to be 

 some reasons for suspecting that rapid growth favors the appearance 

 of the disease, since it is seldom observed ui)on small iwtatoes or those 

 l^roduced late in the season when growth is slow. Exi^eriments were 

 conducted to ascertain the effect of using diseased tubers for seed 

 I)otatoes. The author's conclusions, based upon a single experiment, 

 are: 



"(I) The disease of potatoes known as 'internal brown rot' or 'internal brown- 

 ing' is not transmitted from seed to product; 



" (2) The greater the amount of ' interior browning ' in the seed tubers the smaller 

 the yield. It is therefore not advisable to plant tubers so affected." 



1 Minnesota Sta. Bui. 39 (E. S. R., 7, p. 136). 



