1910.] Notes on Insect and Fungus Pests. 



49 



removed, recovery being impossible. The wood should be 

 cut away well below the point of infection until no trace of 

 diseased wood can be seen. When the injury is confined to 

 one side of a branch the wound should be cut out as cleanly 

 as possible. All parts removed should be burnt, and all 

 wounds made should be at once protected by a coating of 

 gas tar. The fungus only fruits on old, dead wounds, and 

 hence, if diseased patches be removed on their first appear- 

 ance, the disease will be prevented from spreading. 

 Manures should be employed with caution, as it is usually 

 considered that their application greatly predisposes a plant 

 to attack. 



Chrysanthemum Leaf Miner. — Two cases of attacks by this 

 fly have been reported to the Board in the past winter ; one 

 from Troon and the other from the 

 Notes on Insect and neighbourhood of Sheffield. In both 

 Fungus Pests. cases the fly was present in numbers, 

 the correspondent at Sheffield describ- 

 ing his plants as covered with them. The fly 

 {Phytomyza geniculata) belongs to the Agromyzidce, a 

 branch of the Diptera. (See also Journal, Dec. 1907, p. 556). 

 Tobacco extract spray might be tried in addition to the 

 methods there recommended, but as the grub is hidden 

 within the leaf it is very doubtful whether any spray will ever 

 reach it. 



Raspberry Beetle. — A correspondent in Cambridgeshire 

 forwarded to the Board in February a specimen of the 

 raspberry beetle (Byturus tomentosus), several of which he 

 had found among his canes. The first was found on 

 February 14th. 



The mild weather at the time when these beetles were found 

 was no doubt the cause of their early appearance. The 

 beetles were fresh specimens, with the pubescence not at all 

 •rubbed. The early date of the appearance of the adults on 

 the plants is worthy of record. (See also Journal, September, 

 1908, p. 433.) 



