204 
for but few, in comparison, would be killed, 
and I am persuaded were they to be buried ten 
times as deep in the earth as what the roller can 
do they would make their escape. 
Aphis. — 'This plant is much subject to a spe- 
cies of the Aphides, which, when the season 
proves unfavourable to its gi’owing freely, and 
favourable to the insect’s existence, proves a 
serious pest to the crops. This complaint, I be- 
lieve, generally prevailed in the year 1827. They 
are always found on the underside of the leaf, and 
the effect produced will show itself by the leaves 
turning yellow, drooping, and separating from their 
bulb by being deprived of their juices. This may 
be mistaken for a similar complaint, which is term- 
ed Canker, though the stems of the young leaves 
in the latter case are more crippled and rusty 
in appearance : this is probably produced by a 
sudden change in the weather, such as much rain 
after a long drought, &c . ; but the difference will 
be easily ascertained, by searching for the insect. 
For their Destruction. — In the case of 
small crops it will be well worth while to use 
means for their destruction. The Mixture (No. 7) 
may be applied with the engine, and at the same 
time wisk the tops about with the wisk. If the 
Turnips are in rows, the performance will be much 
better effected, and would not be disadvantageous 
to the crops. 
Slugs. — In strong wet land the young plants 
are liable to be destroyed by Slugs. Quick lime 
