DISEASES OF PLANTS. 447 



purshiana, and R. californica, and that its nredo form is also probably found 

 on Calamagrostis and Glyceria. The fecidia from R. cathartica produce 3 forms 

 of Puccinia coronifcra, one occurring on Brotnus spp., another on various 

 si)ecies of Festuca, and the third on Lolium. The secidia on R. alpina and R. 

 pumila appear associated with the rust on Calamagrostis spp. 



The paper concludes with a discussion of the specialization of different 

 species of Puccinia on grasses. 



On the intracarpellar prolification of Zea mays produced by smut infec- 

 tion (Ustilago maydis), H. Iltis {tiitzbcr. K. Akad. Wiss. IVienna], Math. 

 Natunv. EL, 119 (1910), I, No. 3-4, pp. 331-3^5, pis. 2).— The author describes 

 the abnormalities observed in the case of 2 ears of corn. These presented in 

 place of grain a sac-like body from 10 to 20 cm. long with a thread-like pro- 

 longation from 1 to 20 cm. in length. This utricle contained as a prolongation 

 of the axis an abnormal leafy shoot. He regards the whole structure as a 

 result of infection by U. maydis, hyphse of which were found in the cells of the 

 utricle and the leaves of the enclosed shoot. 



Mold on maize on the northern tablelands (Affr. Gaz. N. 8. Wales, 22 

 {1911), No. 12, p. lOJ/S). — A brief note is given on the occurrence of the mildew 

 or dry rot fungus (Diplodia ceo?) on corn. The specimens examined were of 

 the variety American Wondei', and it is stated that this variety is the one most 

 subject to attack. 



Bust in wheat and oats, R. W. Peacock (Agr. Oaz. N. S. Wales, 22 {1911), 

 No. 12, pp. 1013-1016). — ^Attention is called to the varying resistance of differ- 

 ent varieties of wheat and oats to rust in Australia, and it api^ears that the 

 majority of bread wheats are liable to rust infection while the majority of 

 macaroni wheats are practically resistant. Relatively more varieties of oats 

 were found practically free from rust than of wheat. 



The so-called dry spot disease of oats, Hudig {Mitt. Dcut. Landiv. Oesell., 

 26 {1911), No. 21, pp. 380-3S2). — This disease, formerly confined apparently to 

 the bog lands of Holland, is now reported on sandy soils in parts of Holstein, 

 possibly in connection with the excessive use of lime fertilizers. 



The author gives results of his recent experiments with manganese sulphate, 

 which gave considerable increases of yield in both grain and straw. 



On the control of stinking smut (Tilletia fcetans) in winter wheat, K. 

 Stormer {Dent. Landiv. Presse, 3S {1911), Nos. 80, pp. 911, 91S; 81, p. 929).— 

 In continuation of work carried on since 1908 (E. S. R., 20. p. 1042; 22, p. 741; 

 23, p. 34G) reports are made giving results and conclusions to date. 



Dry heated air alone applied as a fungicide to wheat appeared wholly insuf- 

 ficient. Copper sulphate when used in a strength of 0.5 per cent or more for 

 16 hours gave good results. Formalin of from 0.1 to 0.25 per cent applied for 

 from 15 to 30 minutes was effective in tests of both years, and is regarded as 

 the surest of the means tested. Combination treatments are also recommended, 

 and directions for them are given. 



Notes on the club root of cruciferous plants, N. van Poeteeen {Tijdschr. 

 Plant en~icldcn, 11 {1911), No. 4-6, PP- 150-164). — Notes are given on observa- 

 tions regarding the club root of cruciferous plants, due to Plasmodiophora 

 hrassicce, and the author describes some experiments with cauliflower to deter- 

 mine the effect of sterilizing the soil as well as cooking the infection material 

 for periods of 15 and 30 minutes. 



It was found that where the soil was sterilized and uncooked infection mate- 

 rial supplied to the pots all the plants were affected, but sterilization of the soil 

 accompanied by cooking even for the shortest period resulted in a clean growth. 



The Corynespora leaf-spot disease of the cucumber, its dispersal and 

 control, R. Laubeet {Deut. Landw. Presse, 38 {1911), No. 11, pp. 819, 820, 



