DISEASES OF PLANTS. 151 



yellows. Spraying with Bordeaux mixture or witti lime-sulpliur compouud 

 is recoiumended for peacli curl, and the removal and destruction of the trees 

 is suggested where yellows has become established. 



A coffee disease in Guatemala, F. H. u'Heuelle (Bui. Trimcfit. Soc. Mycol. 

 France, 25 (IDOD), Xo. 3, pp. 171-185, pis. 1).— The author describes Phthora 

 vastatrix n. sp., a fungus which is said to cause a serious disease in Guatemala, 

 being particularly destructive in the plantations on the Pacific coast of that 

 country. 



The fungus causes the death of the trees by the hyphte penetrating and 

 clogging up the sieve tubes and by the destruction of the cambium. It seems 

 to infect the trees beginning with the roots and spreading from them to the 

 trunks. 



Some diseases of cacao, F. C. von Faber (A/&. K. Biol. Anst. Land u. Forstw., 

 6 (1908), Xo. 3, pp. 385-Jf06, pi. 1, fig. i ) .—Descriptions are given of the 

 witches' broom disease of cacao, due to Taphrina bussei n. sp., which attacks 

 the young shoots, leaves, etc., and of a stem canker caused by a species of 

 Nectria. Both diseases are said to be quite troublesome in Kamerun. 



Diseases of cacao, J. H. Hart ( ITcs-^ India Com. Vive, 2't {1909), Xos. 289, 

 pp. 509-513, figx. /, ; 290, pp. .533-537, figs. 6).—X summary is given of the 

 diseases to which cacao is subject in the West Indies, with suggestions for 

 their control. In all the author describes about 20 fungus diseases. 



Some Botrytis diseases of Ribes, T. Wulff (Ark. Bot., 8 (1909), No. 1-3, 

 Art. 2, pp. 18, pis. 2, figs. //). — Descriptions are given of- diseases of Ribes 

 aureum, R. rubruni, and R. grossularia due to Botrytis sp., and the relation 

 of the fungus to Sclcrotinia lihcrtiana is discussed. 



The young shoots api)ear to be the portions most affected and on them the 

 sclerotia are largely formed. Cutting out the shoots to admit air and light 

 is recommended. Niti'ogenous manures should be used sparingly about the 

 bushes, as they seem to have an unfavorable effect. 



Notes on some diseases of grapes and on rust diseases of plants, E. Griffon 

 and A. Maublanc (Bui. Trimest. Sac. Mycol. France, 25 (1909), No. 3, pp. 

 1^0-146). — Brief notes are given on the downy mildew attacking the flowers 

 of the grape and on black rot. The rusts described are Puccinia gramints, 

 white pine rust (Peridennium strohi), and a rust of willows due to a species 

 of Melampsora. 



A species of Discosia on living bull pine seedlings, F. I). Heald (Mycologia, 

 1 (1909), No. 5, pp. 215-217, pi. 1). — A technical description is given of D. 

 pini n. sp., which was found during an examination of the National Forest 

 at Halsey, Nebr., in 1907, while an effort was being made to determine the 

 cause of a blight of young pine seedlings. A number of species of this genus 

 are recorded, but all seem to be saprophytic. This species, which is apparently 

 new, was found growing on living seedlings of Pinus ponderosn. It has not 

 yet been determined whether this fungus was connected in any way with the 

 blight that was then prevalent. 



Abnormalities in Hevea brasiliensis, T. Fetch (Circs, and Agr. Jour. Roy. 

 Bot. Gard. Ceylon, .', (1909), Nos. 17, pp. Ilt7-15.'f, pis. 2; 18, pp. 155-164, pis. 

 2). — Attention is called to some frequent abnormalities in seedlings of H. 

 hrasiliensis ^nd also in the trunks of the trees. The principal abnormality 

 of the seedlings consist of peculiar twistings of the different parts of the plant 

 following germination, while in the trunks the author describes certain burs 

 and nodules that occur in the bark or immediately beneath it which seem to 

 be associated in some way with the pricking instruments used in tapping this 

 tree. 



