DISEASES OP PLANTS. 845 



Preliminary investigations by the author of tlie so-called first generation 

 showed that both iniinucleated gametophjtic and binucleated sporophytic 

 mycelia ramified together throughout the infected plants. The general infec- 

 tion of the Canada thistle is held, therefore, to be due to the growth of 2 

 generations by a mixture of the mycelia, and evidence appears to show that 

 both forms winter over together in the undergi-ound parts of the plant. 



Infection experiments with parasitic fungi, O. Tbebous {Ann. Mycol., 10 

 (1912), No. 1, pp. 13-16). — A brief summary is given of infection experiments 

 ■with 10 species of Uredinefe to determine the host plants of their alternate 

 generations. 



Myxofusicoccum, a new genus of Sphaeropsidearum, H. Diedicke {Ann. 

 Mycol., 10 {1912), No. 1, pp. GS-12, flg. 1). — The author proposes the name 

 Myxofusicoccum for a number of parasitic fungi that have been referred to 

 the genera Phoma, Fusicoccum, and Myxosporium. In all IG species are 

 referred to this new genus. 



Oidium tuckeri and Uncinula americana in Poland, J.'Bbzezinski {Buh 

 Internat. Acad. Sci. Cracovie, Ch Sci. Math, et Nat., Ser. B, 1911, No. 1, pp. 

 1-6). — ^A 3-years' study of O. tuckeri and U. americana (necator?), which is 

 here as elsewhere (E. S. R., 23, p. 151) claimed to be the perithecial form of 

 O. tuckeri, leads the author to conclude that not only has this mildew become 

 acclimated in Poland but that in that climate it now passes through the entire 

 cycle of its normal development. 



Neutralizing nematode injury, Krugee (Ztschr. Ver. Dcut. Zuckerindus., 

 1911, No. 661, II, pp. 802-811). — After a discussion of nematode injuries and 

 of means of opposing such attacks, the author gives a preliminary account of 

 his own investigations carried on in open fields as a practical test of theoreti- 

 cal conclusions regarding the relations of nutrition to injury by parasites. The 

 experiments, though not yet complete, have progressed for 3 years, altei'uat- 

 ing sugar beets with barley on heavily infected plats of ground, part of this 

 time under conditions unfavorable to normal crops. 



Fertilizers containing compounds of nitrogen, potassium, and phosphorus 

 were carefully adapted to the several soils, and it is claimed that the results 

 obtained thus far justify the view that loss from eelworm injury may be mate- 

 rially decreased by careful adaptation of fertilizers to soils. 



A canker of Glycine, L. Pavarino (Riv. Patol. Veg., 5 {1911), No. 5, pp. 

 65-68, pi. 1). — Roots of Glycine were received in the laboratory showing dark, 

 irregular, depressed areas of considerable size. An examination of the diseased 

 areas showed that the cortex had been destroyed and that the lesions extended 

 well into the vascular portion of the root. The diseased area was found to be in- 

 fested with bacteria, which were isolated and grown on various culture media. 

 Inoculation experiments left no doubt as to the disease being caused by 

 bacteria. 



The organism from its characters appears to be an undescribed one. and the 

 name Bacterium montemartinii n. sp. is given it. 



Bunt and germination experiments, R. J. Hurst {Agr. Qaz. N. 8. Wales, 22 

 {1911), No. 9, pp. 1. '{9-152) . — A number of experiments are described in which 

 wheat was treated with copper sulphate solution, copper sulphate solution and 

 salt, and formalin to test their effect on germination and also on the percentage 

 of diseased plants. The formalin uniformly gave the best results. The copper 

 sulphate solutions destroyed about 25 per cent of the grain. 



An experiment to determine whether the smut of barley grass would attack 

 wheat gave negative results, none of the plants inoculated with the grass smut 

 being in any way affected. 



