156 EXPERIMENT STATION RECORD. 



is suggested that no lime be used on diseased fields, but that potash be applied 

 iu the form of sulphate of potash or double manure salts. Phosphoric acid in 

 the form of acid phosphate or dissolved bone may be used to correct the alka- 

 linity of the soil. Where other land is available for tobacco, diseased fields 

 should be rotated with some other crop. 



Investig-ations on the susceptibility of various varieties of wheat to smut, 

 (). KiiuiiNEU { Fiihliiufs Landir. Zl</.. .77 (JUOH)^ No. 5, pp- 101-J70). — Tht; 

 resiilts are given of an investigation on a large number of varieties of spring 

 and winter wheats to determine their susceptibility to smut {Tilletia tritici). 



In connection with this investigation the cause of the resistance was studied, 

 particular attention being paid to the claim that in different varieties a relation 

 exists between their susceptibility and their germinative energy. The author 

 failed to find that a low germinative energy was in any way associated with 

 a strong inclination toward infection by smut, and a high germinative energy 

 was not an unfailing character for the determination of the resistance against 

 this disese. 



Wheat nematodes (Schiceiz, Samen Untersuch. u. Versuchsamt. Zurich, 

 FliighL, 1907, No. J, pp. 2; figs. 2). — An account is given of a nematode disease 

 of wheat caused by Tylcnchus tritici. The presence of the nematode is indi- 

 cated by a distorted growth of the wheat and the appearance iu the heads 

 of swollen and distorted grains. 



Where nematodes are believed to be present, it is recommended that the 

 seed wheat should all be submerged in water and the distorted grains rising 

 to the top skimmed off. Where only a slight occurrence of nematodes is noticed 

 the infected plants should be pulled out of the field iu the early spring. 



So far as known this species of nematode occurs only on wheat, no other 

 plant being subject to its attack. 



A contribution to the knowledge of cutting bed fungi, W. Ruhland (Arb. 

 K. Biol. Anst. Land u. Forstw., 6 {1908), No. 1, pp. 11-16, figs. 3). — A descrip- 

 tion is given of Moniliopsis aderholdii n. sp. found on cuttings of asparagus, 

 begonia, Tradescantia, etc., in the cutting beds. 



A disease of globe artichokes, L. Trabut (Bui. Agr. Algeria et Tunisie, I^ 

 (lOOS), No. 2, pp. 35-31, fig. 1). — A description is given of a disease of globe 

 artichokes which is due to a species of Ramularia. 



The infected plants have their inner scales darkened and often more or less 

 rotted. The parasite has not been found in the decayed tissues, but cultures 

 have shown the presence of 2 species of bacteria. It is probable that they are 

 associated with the rotting and follow the injury by the fungus. 



Spraying with Bordeaux mixture or some similar fungicide, if done suffi- 

 ciently early in the season, it is believed would prove efficient in holding this 

 disease in check. The si)raying, however, should be discontinued in time to 

 allow the fungicide to lie washed from the heads. 



A disease of lettuce due to Marsonia panattoniana, O. Appel and F. Laibach 

 {Arh. K. Biol. Anst. Land. u. Forstw., 6 {1908), No. 1, pp. 28-31, pi. 1).—A 

 description is given of a serious disease of lettuce that made its appearance in 

 the spring of 1907 and caused great loss to the crop in certain parts of Germany. 



The cause of the disease was found to be the fungus M. pariattoniana, a 

 description of which is given. By means of culture experiments the fungus 

 was isolated and the disease was reproduced by inoculations. 



For the control of the disease the author recommends the destruction of all 

 diseased plants, care of the seed beds, spraying the plants in the seed bed, and 

 the i-otation of crops, so that lettuce should not. follow where a diseased crop of 

 the same plant has been previously grown, 



