36 MONTHLY NOTES ON GRUBS AND OTHER CANE PESTS. 
results. Along the south side of the field, where we had previously found 
an average of forty-five grubs per stool, 1 could only get an average of 
five. No dead ones were visible in the soil, having probably rotted and 
been carried away by ants. This was the part treated on one side only. 
In the middle of the field, where the stools received treatment on both 
sides, I was unable to find a single grub, and there was a vigorous growth 
of new roots starting. The cane tops also looked beautifully green, with 
no sign of injury from the treatment. I had previously found an average 
of thirteen grubs per stool in this location. Evidently the rains which 
followed, a day or so after the application, saved the cane from any 
ill-effects of the chemical. 
I also found that the grubs were still numerous on the untreated 
portion, and the cane was showing a very noticeable withering, in marked 
contrast to the treated plants. 
EXPERIMENTS WITH NITROGEN FERTILISERS. 
Our field experiments with these chemicals are not completed, but 
there are some observations which should be noted. Experienced growers 
know that the best results come from the application of these fertilisers 
after the rains begin, when they give to cane-growth the maximum 
impetus. In our experiments with nitrate of soda and sulphate of 
ammonia to determine their specific value in making the cane resistant 
to grubs, I find that where these chemicals were applied during the dry 
weather in August their effect upon the growth of the cane has not been 
perceptible, and in the treated field at Greenhills the grubs are showing 
considerably. On the other hand, where ammonia was applied during 
January the cane shows a remarkable development and improved colour ; 
and though I found grubs under some of the stools, the numerous new 
roots are keeping up the vigour of the plant. In another month the 
contest will be decided, for this is the worst season in the activity of the 
grubs. 
Im order to determine the direct effect of these chemicals upon the 
grubs, I placed grubs in soils with varying amounts of the fertilisers, 
giving them no roots to feed upon. The experiment was carried along 
for ten days with no noticeable effect. Several of the grubs became 
injured and died, but those that remained were perfectly normal at the 
finish. I would, therefore, conclude that the control exerted by these 
chemicals les principally in the increased vigour they impart to the 
plant. 
EXPERIMENTS WITH MoLASsEs AS A Bart. 
One might naturally conclude that molasses would be attractive to 
grubs if placed in the soil. It was recently suggested that this would 
act as a valuable bait if mixed with poisons. Experiments, however, have 
demonstrated that the grubs will not eat it—at least, not enough to be of 
value. Where the same amounts of arsenic were used alone in the soil, 
