46 Pflanzenkrankheiten. 



imprimis provinciae Rhenanae. Lieferung IV. N°. 76 — 

 100. (Cöln a Rh., Verlag des Rheinischen Bauernvereins. 1909.) 



Die vorliegende Lieferung ist den früher erschienenen Teilen 

 des sehr empfehlenswerten Exsiccatenwerkes in jeder Beziehung 

 gleichwertig. Sie enthält die Gallbildungen folgender Tiere: 



76. Eriophyes brevitarsus Pocken auf Alnus glutinosa Gaertn., 

 77. Eriophyes laticinctus Nal. auf Lysimachia vulgaris L., 78. Erio- 

 phyes piri Tagenst. var. variolata Nal. auf Sorbus aria Crtz., 79. Erio- 

 phyes stenaspis plicator Nal. n. subsp. in litt, auf Fagus silvatica L., 

 80. Eriophyes truncatus Nal. auf Salix purpurea L., 81. Eriophyes 

 vitis Landois auf Vitis vinifera L., 82. Physopus basicomis E. Reuter 

 n. sp. in litt, auf Vicia eracea L., 83. Aphis persicae Boy er de Föns, 

 auf Prunus persica (L.) Stok. {Amygdalus persica L .), 84. Aphis ru- 

 micis L. auf Amarantus retroflexus L., 85. Aphis rumicis L. aul 

 Rumex obtusifolius L., 86. Aphis spiracella Schout. auf Spiraea ulma- 

 ria L., 87. Enaphalodes strobilobius (Kalt.) C.B. auf Picea excelsa 

 Link., 88. Mysus ribis L. auf Ribes aureum Pursch., 89. Nectarosi- 

 plium rubi Kalt, auf Rubus fruticosus L., 90. Pemphigus spirothecae 

 Pass. auf Populus pyramidalis Rozier., 91. Livia juncorum Latr. auf 

 Lamprocarpus Ehrh., 92. Livia juncorum Latr. auf Juncus supinus 

 Mönch., 93. Urophora cardui L., auf Cirsium arvense L., 94. Perrisia 

 veronicae Vallot auf Veronica chamaedrys L., 95. Isosoma gramini- 

 cola Giraud auf Triticum junceum L., 96. Dryophanta folii (L.) Mayr. 

 auf Quercus pedunculata Ehrh., 97. Dryophanta taschenbergi (Schlecht.) 

 G. Mayr. auf Quercus pedunculata Ehrh., 98. Neuroterus jumipennis 

 Hart, auf Quercus pedunculata Ehrh., 99. Neuroterus tricolor (Hart.) 

 G. Mayr. auf Quercus pedunculata Ehrh., 100. Xestophanes potentillae 

 Vill. auf Potentilla reptans L. M. Schwartz (Steglitz). 



Longman, S., The Dry-Rot of Potatoes {Fusarium Solani). 

 (Journ. Linn. Soc. XXXIX. 270. p. 120-129. 1 Plate. 1909.) 



There has been much difference of opinion as to the parasitism 

 of Fusarium solani. The present paper shows the fungus to be a true 

 parasite capable of destroying the potato tubers and also of killing 

 the aerial shoots; no relationship was found between an outbreak 

 of wet and dry-rot. These results confirm those of Smith and 

 Swingle, Pethybridge and others. 



Comparisons are made with the results of American experiments 

 and it is pointed out that the colour-phases of the mycelium and 

 spores appear to be associated with the stages in the life-history of 

 the fungus, and not with the nature of the culture-media. A series of 

 experiments was also conducted to ascertain whether the tubers 

 could be sterilized as to Fusarium by means of heat, with the result 

 that the death temperature of fungus was found to be higher than that 

 of the potato. Two spore stages only were found, the normal with 

 sickle-shaped conidia (0 — 7 septate) and a later one with small sphe- 

 rical resting-spores. A. D. Cotton (Kew). 



Salmon, E. S., Report on Economic MycoJogy for the 

 year ending July 190 8. (South East. Agric. Coli., Wye. Lon- 

 don. 1909. 2/6.) 



The report gives a detailed account of the work on plant 

 diseases carried out at Wye College during the past year. The fol- 

 lowing are the subjects dealt with: 1. Sphaerotheca mors-uvae; 2. Chry- 



