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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
these studies and investigations would make this paper too lengthy. 
I wish to mention, however, two other control measures that helped us 
to save the Georgia peach crop from the curculio. They are discing for 
pupae destruction, and burning over hibernating quarters during the 
winter months. Upon maturity of the plum curculio larva a cell is 
made in the soil where the pupal stage is passed. Some time is spent in 
preparing this cell, and usually the insect does not pass to the pupal 
stage for a week or more after it enters the soil as a larva. If these soil 
cells are broken, after the insect enters the pupal stage, the helpless 
pupa is soon killed by the pressure and heat of the soil. It had been 
found that these cells were nearly always made within the top two or three 
inches of soil. Consequently the use of an extension disc, which made 
possible the breaking up of the top soil under the spread of the branches 
where most of the pupation takes place, was strongly recommended 
during the latter part of May and the first two weeks in June. The 
orchards are usually worked a great deal anyway at this season of the 
year, and by the grower giving special attention to the discing under the 
trees many pupae were no doubt prevented from developing. 
During the winter months all places near and adjoining peach orchards 
where the curculio might hibernate were burned over close to the 
ground. Fence rows and terrace rows were cleaned up, and rubbish 
piles and pruning heaps destroyed. Woodlands or wastelands ad¬ 
joining peach orchards were burned over. We found that most of 
the hibernation in woodlands takes place within the first three hundred 
yards of a peach orchard, and growers were advised to go into wooded 
areas to that distance and brush back the rubbish with a pronged stick 
and light the windroll, allowing the fire to burn toward the orchard. 
In this way forest destruction was prevented by holding the fire in 
check. Jarring records showed a reduction of adult curculios in the 
Spring in orchards around which hibernating quarters had been burned 
over during the winter. 
In connection with our life history studies at Fort Valley we jar a 
block of trees every other morning from the last of February until 
Fall. During the past season the control measures mentioned in this 
paper were enforced in the orchard used for this work, but were not 
fully carried out during the preceding season. The largest average 
catch of adult curculios in any one day from this orchard during the 
past season was 4.9 beetles per tree, whereas the catch on several days 
during the 1921 season reached 8.8 beetles per tree. There was almost 
a one hundred percent reduction in the curculio infestation in this 
