Reports to the Board of A gri culture. 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 cauliflowers are growing and along the rows of celery. For the 
cauliflowers an ounce to every four square yards and for the celery 
half an ounce every three yards, alternately on each 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 the 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 be 
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 larvae 
of a fly, generally called the Marguerite fly, were sent by a corre- 
spondent from Manchester. 
This insect belongs to the family Phytomizidm. 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 Phytomyza chrysanthemi 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 
lumigation with hydrocyanic acid gas has not been tried and would 
be worth a simple experiment, as the larvae lie close to the surface 
of the leaves. 
