184 
have been free, or nearly so, of this pest. In 
1827, the autumn months were generally wet, and 
Carrots, which before were free, became infested 
to a serious degree by those little miners. 
It is not uncommon, in moist or wet sum- 
mers, to see whole and extensive crops laid waste, 
and rendered useless, by their perforating and de- 
facing the Carrot from one end to the other, 
which effect gives rise to the common term canker, 
which gardeners have so much to complain of in 
this vegetable. 
Respecting their Destruction. — I have 
not been able to discover any thing for their de- 
struction, but it may be observed that the CaiTots 
are most free from their attacks in land during 
the first, second, and sometimes a third year 
after it has been broken up from grass, and also 
in garden land, where a thin crop of winter onions 
is; or growing a thin crop of Carrots will often 
be found to succeed. The seed may be worked 
in either with a three-grained fork or hay-rake ; 
or, if the Onions are too strong to use the rake 
or fork, a thin covering of earth may be thrown 
over the beds out of the alleys, which will suffice, 
if sown not later than March. In place of sowing 
in the beds, the alleys may be sown after a thin 
digging, only sufficient to make it convenient to' 
work in the seed, and assist the plant when 
young. If the land is in good order for Onions, 
no tillage will be required. This practice will be 
found to answer in most cases where land is light. 
