306 



Insect Pests. 



Abroad it occurs in all the northern European States, Germany, 

 France and Italy. 



Treatment. 



Spraying with hellebore wash or arsenical wash when the larva? 



are abundant is certainly advisable in nut plantations when the 



young larvie are at first seen, as they cause great havoc, and the 



parasites mentioned above do not do any good until all the damage 



is done. 



References. 



(1) Theobald, F. V. Report on Economic Zoology for year ending April 1st, 



1906, p. 42 (1906). 



(2) Theobald, F. V. Report on Economic Zoology for the year ending 



April 1st, 1907, p. 60 (1907). 



(3) Cameron, P. ' A Monograpli of British Phytophagous Hymenoptera,' 



vol. II., p. 35 (1885). 



THE NUT CATKIN MIDGE. 



{Creidumyia corijll. Kalt.) 



The male catkins of the filbert, cob and hazel nuts are often 

 attacked by the small maggots of one of the gall-flies or Ceci- 

 domyidu'. 



The mature insect I have been unable 

 to breed so far, nor do I know of any 

 description of it. It is not recorded by 

 Verrall (1), yet it is widely distributed, 

 Ijeing very abundant in Kent, Sussex, 

 Middlesex, and I have found it in Here- 

 fordshire and Devon. 



The damage done by it does not 

 appear to be generally very serious, but 

 Mr. Hammond of Canterbury wrote me 

 in 1899 that it was so abundant in that 

 part of Kent that it could be found on 

 every nut tree in large numbers. 



Weitenweber (2) and Kaltenbach (3) 

 refer to it in Germany. 



References. 

 (1) Verrall, G. H. ' List of British Diptera ' 

 (2nd ed.), p. 7 (1901). 



(2) Weitenweber. ' Lotos,' p. 143 (1868). 



(3) Kaltenbach, J, H. ' Pflanzenfeijide,' p. 637 (1874), 



[W. H. Haminoml. 



FIG. 2U5.— MALE CATKINrOF NIT 

 ATTACKED BY CECID LARV.E. 



