No. 3, October, 1921] PATHOLOGY 255 



(Phoma musae) with Bordeaux mixture plus a resin-salsoda sticker is given. An annotated 

 list of diseases affecting taro, peanuts, figs, bananas, and grajte vinos is included. — J. M 

 Westgate. 



1556. Elliott, John A. A mosaic of sweet and red clovers. Phytopathology 11: 14G- 

 14S. Fig. 1. 1921. — A mosaic disease was found occurring naturally on plants of red clover 

 {Trifoliinn pratense) and sweet clover {Melilotus alba). Cross inoculations proved that the 

 disease could be easily transferred from one species to the other and from both to plants of 

 Vicia faba and Medicago arabica. All attempts to inoculate plants of Medicago saliva and 

 Trifolium repens failed. — B. B. Higgins. 



1557. Enslow, JElla M. A., and Frederick V. Rand. A lotus leafspot caused by 

 Alternaria nelumbii sp. nov. Phytopathology 11: 135-140. PL 4, fig- 1- 1921. — A leaf-spot 

 of Egyptian lotus (N elumbiuyn spcciosiitn) is ascribed to Allernaria nelumbii n. sp. The spots 

 appear first as small, smooth, reddish-brown flecks which later enlarge to a diameter of 5-10 

 mm. and tend to develop concentric light and darker markings. The above named fungus 

 was isolated from these spots and its pathogenicity proved. — B. B. Higgins. 



1558. Eyer, J. R. The influence of leaf hopper control on potato yields. Jour. Econ. 

 Entomol. 14: 69-71. 1921. — The author reports experimental work with Bordeaux mixtures, 

 Bordeaux-nicotine, lime-nicotine, and nicotine-soap for the reduction of burning caused by 

 leaf hopper {Empoasca mali) and to determine the effect of these control measures upon yield. 

 Bordeaux (4-4-50) gave the best practical control. One set of plots was sprayed by hand and 

 another by machine; the results were decidedly in favor of machine spraying, both from the 

 standpoint of hopper-burn control and from the standpoint of yield. — A. B. Massey. 



1559. Fabricius. [Rev. of: Grabxer, Paul. Lehrbuch der nichtparasitaren Pflan- 

 zenkrankheiten. (Textbook of non-parasitic plant diseases.) S33 p., 244 fig- Paul Parey: 

 Berlin, 1920.] Forstwiss. Centralbl. 43: 184-185. 1921.— This book corresponds, in the field 

 of non-parasitic diseases, to von Tubeuf's work on parasitic plant diseases. Forestry, 

 while more or less helpless against parasitic diseases, can usually combat the others by means 

 of silvicultural measures. Grabner discusses the diseases under the following heads : Diseases 

 due to (1) unfavorable soil conditions; (2) humidity and wind movement; (3) heat and light; 

 (4) wounds; (5) noxious gases and liquids; (6) enzymes. — W. N . Sparhawk. 



1560. Fenton, F. a. Progress report on the season's work on the production of potato 

 tipburn. Jour. Econ. Entomol. 14: 71-83. 1921. — Studies and observations are reported on 

 the nature of tipburn and habits of the insect which causes it. Tipburn was produced by the 

 leaf hopper (Empoasca mali) to the same extent and equally rapidly under diverse environ- 

 mental conditions of the host plants, such as soil type, soil moisture, humidity, and presence 

 or absence of sunlight. The injury is local, not systemic, and is in itself the greatest factor 

 in inducing burning. Severity of tipburn in fields is correlated with leaf-hopper population 

 and not with sunlight, maximum temperature, or minimum humidity. Other potato insects 

 are not concerned with tipburn. Mechanical injury such as needle punctures in veins gave 

 no definite results. Complete severing of a midrib induced burning of leaflets in 19 days. 

 Bordeaux mixture prevents tipburn by repelling ovipositing females. — J. E. Kotila. 



1561. MtJLLER, B. DasTannensterbenimFrankenwalde. [Dying firs in the Frankenwald.] 

 Forstwiss. Centralbl. 43: 121-130. 1921.— A discussion of the cause of extensive dying out of 

 firs in the Frankenwald, with a criticism of some of Scheidter's conclusions as to the causes, 

 and remedies are given. Death appears to be due to an epidemic of the "Hallimasch" {Agari- 

 cus ynelleus), which is normally a saprophyte, but becomes parasitic under certain conditions, 

 especially a prolonged drought. While Mtiller questions whether the methods of silvicultural 

 management recommended by Scheidter will eliminate the disease, he suggests a number of 

 points that need careful investigation. — 11', A'. Sparhawk. 



