Reports fo the Boani of Agricitlture. 159 



If they are doing very much harm, only in a small area, it would 

 be worth while to inject bisulphide of carbon into the ground where 

 the caulitlowers are growing and along the rows of celery. For the 

 cauliflowers an ounce to every fom' square yards and for the celery 

 half an ounce every three yards, alternately on eacli side of the rows, 

 care being taken to put it about six inches away from the plants and 

 under the sloping earth, so that it will descend down to tlie roots. 



Soot and lime were tried by Colonel Lloyd, and he reported as 

 follows : — 



" We mixed soot and lime with the soil, and put some Aptera in 

 it, with the result that they were all killed ; so I hope we shall 1 le 

 able to get rid of them, as they live in the soil." 



ANIMALS INJURIOUS TO ORNAMENTAL PLANTS. 



Grubs of Phytomizidse in Marguerite and 

 Cineraria Leaves. 



Some Marguerite and Cineraria leaves attacked by the larvie 

 of a fly. generally called the Marguerite fly, were sent by a corre- 

 spondent from Manchester. 



This insect belongs to the family Fhijtomizidai. The species that 

 was attacking the leaves sent was Napomyza lateralis. These flies 

 are all " miners " when in their larval stage, and pupate in the 

 tunnels they make. A species called Phytom!jr.a chrijsanthcmi does 

 much harm in America, and also probably occurs in Europe. There 

 is great difficulty in identifying the species of these miners — the 

 adults only can be named with any degree of certainty. 



Treatment. 



On a small scale there is nothing like hand-picking ; if that fails, 

 it is owing to the work not being done thoroughly or the leaves 

 not being destroyed afterwards. When plants are young, paraffin 

 emulsion spraying has met with success. 



There is no known remedy, but it may be pointed out that 

 fumigation with hydrocyanic acid gas has not been tried and would 

 be worth a simple experiment, as the larva: lie close to the surface 

 of the leaves. 



