54 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Mr. Alvah Peterson: In the last statement made on the use of 
various chemicals and mechanical barriers against the young borers, it 
was said that up to date we haven’t sufficient data to give any con¬ 
clusive facts in regard to the use of tree protectors. We put on one 
hundred Scott tree protectors and also sprayed a number of trees 
w T ith various chemicals and insecticides such as fish oil soap, nicotine 
resinate, “scalecide,” crude phenol, etc. During the past season, the 
adults came out late compared with records of former years. In New 
Jersey, the greatest emergence occurred about the 20th of August. 
This late emergence gave the majority of the larvae only a short time 
in which to grow before winter set in, consequently we found that the 
larvae were very small when we bored the trees about the 15th of 
November. In boring we found no small larvae under the tree pro¬ 
tectors, but I am not sure that this will be the condition when we bore 
again next spring. In using tree protectors, we not only sealed them 
with asphalt and some with borene, but we also made use of a strong 
paper clip which was slipped over the tarred paper where the two mar¬ 
gins overlapped. This helped to hold the protector in position while 
the asphalt or borene sealed the openings. Where paper clips were 
used, it was only necessary to reseal the protectors once about 30 days 
after they were put on and at this time only 50 per cent of them showed 
any cracking or splitting. The above does not agree with our former 
experience with tree protectors where we resealed several times. Un¬ 
doubtedly the paper clip is an important additional feature. 
Since we are still experimenting with tree protectors, I am not willing 
to go on record as saying that the tree protector is going to eradicate 
the larvae, but so far as the present evidence is concerned it looks 
favorable. 
Mr. J. L. King: Mr. Peterson’s remarks concerning the tree pro¬ 
tector as a control of peach tree borers are very interesting to me. His 
results are more encouraging than my first experiments were. While 
an assistant in the Ohio Experiment Station in 1916 we conducted a 
test of 70 tree protectors at Gypsum, Ohio. 
The first orchard used was about seven years old, and was seriously 
infested with Sanninoidea larvae, which averaged 7 per tree, with an 
100 per cent infestation in the check trees. In this orchard 50 pro¬ 
tectors were placed about June 15. One-half of these were sealed with 
tar and the remainder with tree tanglefoot. The protectors were re¬ 
sealed three times during the egg-laying season (July 5 to September 5). 
At the close of the season the trees were examined for borers. The 
infestation was 100 per cent, and the average number of larvae per 
tree was 5. 
In the second orchard a plot of 20 trees was used. These were 7 
