46 EXPERIMENT STATION^ BECOED. 



the secidinm on Oxalis corniculata. The relation of Puccinia to other species 

 of Oxalis is being investigated. 



A brief account is given of investigations of a fnngns parasite of bagworms 

 which has been found quite efficient in destroying these pests. The use of this 

 fungus, to which the name Isaria psychidce n. sp. is given, is said to be com- 

 plicated by the fact that it is heavily parasitized by another fungus, Melano- 

 spora parasitica. 



The author reports some experiments on the crown gall due to the organism 

 Bacterium tumefaciens, and states that this organism caused considerable 

 damage in South Africa, especially to peach, apricot, and apple trees. The 

 willow is also very subject to attack and is held in some measure to be respon- 

 sible for the dissemination of the disease throughout the country. 



The silver leaf of stone fruit trees described is characterized by a silvering 

 of the foliage of apricot, peach, and plum trees. Careful investigations which 

 have been repeated a number of times have in no case shown the presence of 

 the fungus Stereum pnrpureuni, which is usually held to be the cause of this 

 disease. 



Notes on some diseases and enemies of cultivated plants in the far East, I, 

 L. DuPOBT {Bui. Econ. Indochine, n. ser., 15 {1912), No. 99, pp. 78J -803). —Fol- 

 lowing a preliminary account of the attack of fungi on plants, the author 

 notes the occurrence of and briefly describes a number of fungus parasites on 

 field, orchard, garden, and other plants. The arrangement is by host plants, 

 and the species known to occur in Indo China are definitely indicated, while 

 others reported as having been observed in this or contiguous regions are also 

 noted. 



Report on plant diseases, 1910-11, G. P. Dabnell-Smith {N. 8. Wales Rpt. 

 Govt. Bur. Microltiol., 2 {1910-11), pp. 168-172). — Notes are given on diseases 

 observed on a large number of economic plants, together with descriptions, and 

 in some instances suggestions are made regarding methods of treatment. 



Contributions on the TJstilagineae, F. Rawitscher {Ztschr. Bot., // {1912), 

 No. 10, pp. 673-706, pi. 1, -figs. 20). — This is an account of the author's investi- 

 gations regarding the behavior of cells and nuclei during the development of 

 Vstilago tragopogonis, U. maydis, and V. carl)o in their respective hosts, yellow 

 goats beard, corn, and oats. See also a previous note by Lutman (E. S. R., 

 26, p. 341). 



A contribution on the dry spot of cereals, Kuhneet {Deut. Landw. Presse, 

 JfO {19 IS), No. 8, pp. SI1-S6). — The author carried out experiments testing the 

 conclusions arrived at by Clausen (E. S. R., 24, p. 449), that dry spot of oats 

 with resulting loss in crop returns is due to improper proportioning and appli- 

 cation of chemical fertilizers, particularly lime. The fertilizers applied were 

 Thomas slag 600 kg. per hectare (534 lbs. per acre), kainit 600 kg., nitrate of 

 soda 150 kg., ammonium sulphate 125 kg., superphosphate 450 kg., and lime 

 3,000 kg. 



The largest increase Ln yield of grain over the unfertilized control, 1,960 kg. 

 per hectare, was obtained by the use of Thomas slag, kainit, nitrate of soda, 

 and lime. From the results obtained with the various combinations tried, it 

 is concluded that the addition of lime in the quantity employed makes com- 

 paratively little difference in yield, but that the effects of dry spot may be 

 materially lessened by a more careful adaptation of artificial fertilizers. 



A leaf spot of cereals, F. Keause {Jahresher. Ver. Angew. Bot., 9 {1911), 

 pp. lOS-116).— The author investigated a case of leaf spot occurring on lighter 

 soils in restricted areas of the province of Posen, attacking in order of severity 

 oats, wheat, rye, and barley, also with considerable variation as to symptoms 

 and severity, flax, horse beans, sugar beets, carrots, and potatoes. It is con- 



