614 
The Diamond-back Moth. 
appearance of the moths, both swede and yellow turnips presented 
the appearance as if lime had been sown on them. On looking more 
particularly, it was found that the plants were infested with small 
green caterpillars which had eaten the underside of the blade, 
leaving the thin film on the upper surface. In this way whole fields 
were destroyed. In other cases portions of a field seemed to escape 
with comparatively little damage. 
In the following pages the information given me in reply to rny 
circulars is divided and classed for convenience of reference under 
the various headings to which the observations refei", the initials of 
the sender beiiig appended. 
In the return immediately following, as conditions affected by 
geographical locality would affect the state of the crop, I have 
arranged the notes, as before, under headings of countries and 
counties. The subsequent observations are arranged alphabetically 
according to the initials appended. 
1. Any estimate of amount of loss, ivliether in acreage, mileage, or 
7noney loss on crop. 
England. 
Yorkshire. — " In this district (Lebbei'ston, near Filey) the cater- 
pillars have ruined the swede ci-op ; there will be only half a crop. 
Turnips have not sufiered nearly as much." — J. P. D. 
" In some localities [of the chief turnip-growing districts in 
Yorkshire. — E. A. O.] the turnip seems nearly worthless, in others 
half a crop, and the best where attacked, I should consider, will 
only make two-thirds." — G. C. 
" I have had no root-crop quite destroyed, but the estimated 
produce per acre of kohl rabi has been lessened 75 per cent., 
swedes and white turnips 50 per cent., and yellow turnips 25 per 
cent. Mangel quite untouched." — R. W. S. 
" Damage slight at present ; impossible to estimate." — F. R. 
" Loss on swede turnip crop about one-third the white ; green 
top and Lincolnshire red turnips have not been affected by the 
moth." — R. C, for Lord Auckland. 
Lincolnshire. — " Swedes damaged greatly here (between the 
river Ancholme and the Trent), probable loss of 50 per cent, of 
resulting food. Five per cent, of swede area only totally destKoyed. 
White-fleshed varieties not much damaged here (oolite), but much 
so on the Wolds " (chalk). — N. Lines. 
Norfolk. — " Loss from this attack veiy considerable, especially 
near this coast, N. and N.W. Norfolk, where both cabbages and 
turnips were attacked." — E. A. A. 
" In early sown turnips the loss in yield is about 25 per cent., 
in later 15 per cent." — C. R. 
Norfolk and Sttffolk. — " So far as Gorton and Whitlingham are 
concerned, taking tlie swede crop (which is the only one injured) at 
6/. per acre as the maximum value of a full well-grown plant of 
