MONTHLY NOTES ON GRUBS AND OTHER CANE PESTS. 33 
fields le well within the one-half mile limit from feeding-trees. Here 
the worst infestation was on the high ground, where the beetles would 
naturally come to rest from their flight. It must also be noted that these 
high spots are naturally poor in humus, and consequently the work of 
the grubs is more quickly noticeable. ‘ 
FreLtp EXPERIMENTS. 
The cane in the cultivation plots at Greenhills is at present looking 
well, especially the plant cane in fields D1 and D2. Unfortunately, I was 
unable to get the cultivation started as early in the flight of the beetles 
as I desired, and in the ratoon field E1 it was almost a month late, in 
some of the plots, so that small grubs were turned up at the very first 
treatment. It will be noted from the map that all three of these fields 
border the feeding-trees and have always been the ones most infested, 
so we are hoping for some rather conclusive results in spite of our late 
start. 
It will be interesting to note from the map that the fields L6 and 
L7 are in the badly infested area, but, as I have previously noted, a 
successful crop was secured from these at the last cutting. The lower 
half of L6 was planted near the end of September, 1917, and after late 
cultivation produced an excellent crop; the upper half, planted in June, 
1917, was a failure, because of the grubs, which put the cane down in 
February, 1918. The field L7 was planted about the first of October, 
1917, but had rather poor cultivation and was pretty weedy. In spite 
of this the crop was fair, indicating that even the horse-work it got 
disturbed the grubs so that they were held in check. 
CANE GRUB INVESTIGATION, MARCH, 1919. 
The heavy rains which started on the 25th of February have saved 
the day in many of our cane fields. Conditions were prime for the 
grubs, and they were getting in their work to an alarming extent. <As 
usual, Greenhills was the first to show the characteristie yellowing in the 
affected portions. Some of the ratoon fields lying near the woods have 
already succumbed, in spite of the rains. 
F'EEDING-TREES. 
Continuing the study of the relation of feeding-trees to infestation, 
I have made further interesting observations, and can now say with some 
confidence that the beetles travel approximately half a mile when going 
with the wind, but scarcely any against it. These conclusions are based 
upon numerous observations in a number of localities, and in no case 
have I found evidence to refute these conclusions. 
As pointed out last month, the infested areas at Greenhills lie princi- 
pally within the half-mile limit, and the worst infestation is in the 
higher parts of the fields lying near the feeding-trees. 
Cc 
