The Association of Economic Biologists 



President 



Profkssok J. B. FARMER, D.Sc, F.R.S. 



Vice-Presidents 



Professor W. SOMERYILLE 

 A. G. L. ROGERS, Esq. 



Hon. Treasurer Hon. Sec. for Publications 



J. a F. FRYER, Esq., E. E. GREEN, Esq., 

 The Pathological Laboratory, Way's End, 



Royal Gardens, Camberley. 



Kew. 



Hon. Secretary (General and Zoology) Hon. Secretary (Botany) 



S. A. NEAVE, D.Sc, W. B. BRIERLEY, Esq., 



89, Qvieen's Gate, S.W. 7 Rothamsted Experimental Station 



Council 



Lt.-Col. ALCOCK, I.M.S., F.R.S. A. D. IMMS, D.Sc. 



Prof. B. T. P. BARKER R. T. LEIPER, ]).Sc. 



S. E. CHANDLER, D.Sc. G. A. K. MARSHALL, D.Sc. 



F. J. CHITTENDEN A. G. L. ROGERS 



A. D. COTTON Prof. W. SOMERVILLE 



CONTENTS OF Vol. VI, Nos. 2 & 3 



PAGE 



1. A Phytophthora Rot of Pears and Apples. By H. Wormald, 



D.Sc. (Lond.), A.R.C.Sc. (With 2 Text-figures and Plate III) . 89 



2. Notes on the Biology of Necrohia ruficollis, Fabr. [Coleoptera, 



Cleridae]. By Hugh Scott, M.A., Sc.D. (Cantab.). (With 2 Text- 

 figures) 101 



3. On the Life-History of " Wireworms " of the Genus Agriotes, Esch., 



with some Notes on that of Athous Haemorrhoidalis, F. Part I. 



By A. W. Rymer Roberts, M.A. (With 5 Text-figures and Plate IV) 116 



4. On a Coenurus in the Rat. By M. Turner, B.Sc. (With 1 Text- 



figure) 136 



5. Some Factors in Plant Competition. By Winifred E. Brenchley, 



D.Sc. (With 10 Text-figures and Plate V) 142 



6. A Contribution to the Life-History of the Larch Chermes (Cnaphalodes 



strobilobhis, Kalt.). By Edward R. Speyer, F.E.S., M.A. (Oxon.), 

 Carnegie Scholar. (With Diagram and Plates VI and VII) . . 171 



7. Studies in Bacterio.sis. IV. — " Stripe " Disease of Tomato. By 



Sydney G. Paine and W. F. Bewley. (With 5 Text-figures and 



Plates VIII and IX) 183 



8. Notes on the Life-History of Epkestia kuhniella. By Raymond 



V. Wadsworth 203 



9. Notes. By J. C. F. Fryer 207 



10. Review 210 



