556 



Insect, Fungus and other Pests. 



[dec, 



with bisulphide of carbon or with hydrocyanic acid gas, as 

 referred to above, would be a very effective means of com- 

 bating Anobium ftaniceum. 



Flies. — From Sevenoaks and Exeter specimens of celery 

 infested by the maggots of the celery fly were received. This 

 pest is described in Leaflet No. 35. Several broods occur 

 during the year, and the maggots have been found in the 

 leaves right into the winter. Specimens of cineraria from 

 Sevenoaks were also infested with a leaf-mining maggot, 

 which may be combated in the same way as the celery fly. 



Chrysanthemum Leaf-Mining Fly. — At the end of September 

 specimens of chrysanthemums were received from New- 

 machar, Aberdeen, and it was found that they were infested 

 with the maggots of a leaf-mining fly. The fly has since been 

 bred out from the material sent, and has been identified as 

 Phytomyza geniculata (=P. horticola). This fly has a similar 

 life history to the celery fly (Acidia heraclei), and the measures- 

 recommended in Leaflet No. 35 against this pest should be 

 practised in the case of P. geniculata. It may be remarked 

 that this fly can also breed in the sow thistle (Sonchus oleraceus) 

 and this is an additional reason why this weed should be 

 eradicated. An Ichneumon fly parasitic on the maggots of 

 P. geniculata was also bred out from the specimens sent. 



Sciara Fly in Savoys. — On dissecting the roots of savoy 

 plants forwarded for examination from Leicester both wire- 

 worms and the maggots of a sciara fly were found. The 

 sciara fly maggots are scavengers and not direct spoilers of 

 the root. Higher up the plant at its apex, where the leaves 

 still remained, galleries of the cabbage root fly, Phorbia 

 brassicae (Leaflet No. 122) were also found, while "the root 

 was also fungus-infested. The savoys were therefore attacked 

 by wireworms, cabbage root fly, and a fungus, while sciara 

 maggots were present as scavengers. 



Aphides. — Specimens of apple trees sent from Reading 

 and Finchley were found to be infested with woolly aphis 

 see Leaflet No. 34). In one case a larva of a hover fly (see 

 Journal, Vol. v., No. 3, December, 1898, p. 328) was found. 

 Hover fly larvae should be protected as they are very useful, 

 preying on the aphides. 



Cauliflowers, Brussels sprouts, &c, from Bolton were found 



