INSECTS, MITES, ETC. 



255 



with an insecticide. Lay down poison for Cockroaches, 

 ?nd sponge with an insecticide to eradicate Mealy Bug. 



Leaf-mining: Magrgrot — The larvc^ of the Mar- 

 guerite Leaf-mining Fly (Phytomyza affinis) frequently 

 do considerable injury to the leaves of the chrysanthe- 

 mum and marguerite by boring small channels between 

 the two surfaces. The maggots feed on the soft tissues, 

 cause blisters and whitish zis^zag tunnels to form on the 



LEAVES INJURED BY JJAHGUKRITE FLY LARV.E. 



surface. When very numerous the functions of the 

 leaves are seriously disorganised, and the health of the 

 plant badly affected. The fly is like the Common House 

 Fly in shape, and of a dark, slaty-black or ash colour. It 

 measures one-fifth of an inch in the spread of its wing, 

 and about one-twelfth of an inch in length. The flies 

 appear in May and June, and deposit their eggs, by means 

 of an ovipositor, in the cuticle of the leaf. When fully 



