545 



likely to harbour the disease, of all remnants of the crop after harvest, 

 and of insect disseminators, the use of clean seed and tubers, and where 

 possible, the selection of immune varieties. 



Attention is called to the various difficulties encountered in 

 attempting to carry out these recommendations, particularly with 

 regard to the destruction of insect carriers such as Aphids. In this 

 connection the need for a cheap contact insecticide for these and other 

 sucking insects is pointed out. 



Gardner (M. W.). Insects as Disseminators of Plant Diseases. IV. 

 Urgent Problems of the Future. — Phvtopathologv, Lancaster, Pa., 

 xii, no. 5, May 1922, pp. 233-240. 



The opinions of a number of mycologists and entomologists on the 

 question of insects as disseminators of plant diseases are summarised. 

 Some of the most important problems in this connection are presented 

 by the mosaic diseases, the investigation of which necessitates a 

 specialised technique, making close co-operation between mycologists 

 and entomologists essential. A programme of work for the solution 

 of these problems is outlined ; they are divided into those concerning 

 the mycologist, the entomologist, and both in conjunction. 



Rankin (W. H.) & Hockey (J. F.). Mosaic and Leaf Curl (Yellows) 

 of the Cultivated Red Raspberry. — Phxtopathologv, Lancaster, Pa., 

 xii, no. 6, June 1922, pp. 253-264. 



This information has already been noticed elsewhere [R.A.E., A, x, 

 459]. 



QuAST (M.). Beitrage zur Kenntnis der Sameniibertragung bei 



Ephestia kneliniella, Zeller. [Contribution to the Knowledge of 

 Fertilisation in E. kiilmiella. ZelL] — Archiv. Natnrgesch., Berlin, 

 1920, Ixxxvi, Ser. A, pt. 10, March 1921, pp. 70-90, 13 figs. 



The contents of this paper are indicated by its title. 



MicoLETZKY (H.). Die freilebenden Erd-Nematoden. [The Free-living 

 Earth Nematodes.] — Arcli. Natnrgesch., Berlin, 1921, Ixxxvii, 

 Ser. A, pts. 8 & 9, March 1922, pp. 1-650, 1 plate, numerous figs. 



This monograph deals with the free-living Nematodes with special 

 reference to those occurring in Steiermark and Bukovina. It comprises 

 a revision of all free-living Nematodes (excluding marine forms). The 

 genera are described, and keys are given to them. 



Herberg (M.). Coccidenstudien. [Studies on Coccids.] — Arch. 

 Natnrgesch., Berlin, 1922, Ixxxvii, Ser. A, pt. 10, March 1922, 

 pp. 243-300, 7 figs. 



The development of the tracheal system of the following Coccids is 

 described : Chrysomplialus dictyospermi, Morg., Lepidosaphes pinnae- 

 formis, Bch., L. gloveri. Pack., Parlatoria zizyphi, Luc, and P. pergandei, 

 Comst. 



