50 MONTHLY NOTES ON GRUBS AND OTHER CANE PESTS. 
After dusting, the trash should be relieved slightly, thus bringing the 
arsenic largely into the middles of the trash piles, where the grubs are 
sure to reach it as it combines with the decaying organic matter. Asa 
matter of course the ovipositing beetles will seek these piles of rubbish, 
and the young grubs may get their death-blow before the advent of the 
dry weather, at which time they usually attack the cane roots. 
It will be of interest to users of arsenic to know that soreness 
developed on hands and other parts of the body can be quickly cured by 
bathing the affected parts in a solution of hypo (hyposulphite of soda). 
This I learned years ago when | was using the poison constantly. 
NECTAR-BEARING EK LOWERS FOR PARASITES OF WHITE GRUBS. 
Last month I ealled attention to the importance of this subject, 
hence I was considerably interested when I found these beneficent 
insects in great numbers in the flower garden at Mr. Sugden’s farm, 
which, by the way, is the finest display of colour I have recently seen. 
Most canegrowers consider their time too occupied for the growing of 
flowers, but the trouble of gardening will probably be proved to pay in 
more ways than one. Both sexes of the wasp Campsomeris tasmamensis 
were very busy in the garden on sunny mornings, especially on the 
flowers of the Klondike cosmos and pigeon pea. 
It is not improbable that these insects have assisted materially in 
eradicating the grubs which formerly troubled these fields. 
Mossman District. 
The Beetle Borer, though practically wiped out in most parts of 
the district by the tachinid parasite (Ceromasia sphenopheri), has 
become somewhat troublesome in one field on the farm of Crees Brothers. 
This is the location where I secured the parasites last year, and both 
parasites and borers have multipled there because the cane was simply 
volunteered without burning the trash. 
Fully 90 per cent. of the borer-beetles’ grubs are parasitised. The 
only grubs which escape the flies are those down in the butts of the 
stalks, where the flies find difficulty in reaching them. 
It is interesting to note that a large proportion (more than half) 
of the flies had already escaped from the puparia. Therefore it would 
appear best to collect these infested stalks earlier in the season, say, about 
April, for cane planted late in August, or when the cane is about eight 
months old. 
For the control of this borer-beetle it is decidedly best to burn the 
trash, for then practically all the grubs succumb, even when inside the 
discarded sticks on the ground. The flies, on the other hand, are more 
apt to escape to other fields if the burning is done after cutting the cane 
green. This I found to be the case in the mill nursery, where we first 
secured the parasites. Here the trash was burned off after cutting, and 
I was unable to find a single live grub in the blackened stalks. This cane 
