DIAMOND-BACK MOTH. 125 
‘* Diamond-back Moth”’; if seen sideways, the curved-up extremity of 
the wings, as shown at 8 and 4 in the figure, is very striking. 
PreveNnTION AND Remepies.—Such measures as were found service- 
able in the great attack of 1891 were entered on fully in my Annual 
Report for that year, and also in my Official Report to the Royal 
Agricultural Society as their Consulting Entomologist ; and the main 
points of these are embodied in a leaflet on this infestation, of yea if 
should be happy to send copies (free) to any applicant. 
But it may be noted that one important point is to keep watch for 
the very first appearance of attack, so as to be able at once to make 
requisite applications to keep up the strength of the plant under the 
injury. 
Of the various recipes sent, one that was named on trustworthy 
authority as answering well during bad attack of 1891 was an appli- 
cation of 10cwt. soot, 8 cwt. nitrate of soda, and 1ewt. ammonia, mixed 
well, and sown broadcast by hand, whilst the dew was on the leaves, 
at the rate of 1cwt. per acre. 
Nitrate of soda and soot mixed were mentioned as very useful, 
where there was rain to soak the application down; also the use of 
nitrate of soda at the time of singling, the worker sprinkling a little 
as he goes along, and so the effect being greater than in broadcasting. 
Use of scufflers with boughs fastened on them to brush the cater- 
pillars down (which fall on alarm) does good, but the great point is by 
every possible means to keep up the strength of the plant till the time 
of feeding of the caterpillars is past. 
It is well said, when attack is about, that the caterpillars, being on 
the under side of the leaves, there are great difficulties in the way of 
getting at them by sprayings or dressings of any kind; but if we can 
by any means induce a growth which will counterbalance the daily 
ravage of the grubs, we have a good chance of carrying the crop on 
until the infestation lulls off in course of nature into the chrysalis 
state. 
