54 
THE SUGAE-BEET WIREWORM. 
Table III. — Experiments with turpentine as a deterrent against the sugar-beet ivireworm. 
Larvae 
used. 
Seeds 
used. 
Seeds attacked. 
Seeds un- 
touched. 
Larvae 
missing. 
Larvae 
kiUed by 
fungus. 
Before 
germina- 
tion. 
After 
germina- 
tion. 
Dura- 
tion of 
test. 
Experiment 
Check 
Experiment 
Check 
Experiment 
Check 
50 
50 
25 
25 
25 
25 
15 
10 
10 
10 
10 
10 
3 
3 
4 
5 
8 
5 
1 
2 

3 
7 
8 
3 
3 
2 


\ 
4 



1 
2 
1 
Days. 
20 
20 
30 
3a 
30 
30 
A glance at columns 6 and 7 of Table III shows that there is little 
difference between the treated and untreated seeds — too little to 
promise much for this method. 
KEROSENE. 
Kerosene was given a trial as a deterrent in spite of the fact that it 
gave negative results in the experiments of Comstock and Sliugerland. 
The seeds were treated by soakiug in kerosene overnight. The kero- 
sene in some instances removed part or all of the skin from the seeds. 
The results are summarized below. 
Table IY. — Experiments tvith kerosene as a deterrent against the sugar-heet wireicorm. 
Seeds attacked. 
Seeds un- 
touched. 
Larvae 
missing. 
Larvae 
killed by 
fungus. 
Diu-a- 
tion of 
test. 
Larvae Seeds 
used. ! used. 
! 
1 
Before 
germina- 
tion. 
After 
germina- 
tion. 
Experiment 
50 
50 
25 
25 
25 
25 
15 
15 
10 
10 
10 
10 
8 
12 
8 
10 
7 
8 
3 
1 
1 

1 
2 
4 
2 
1 

2 

2 

1 
4 


2 
6 

1 


Days. 
20 
Check 
20 
30 
Check 
30 
30 
Check 
30 
This table shows that while treated seeds are a little less liable to 
attack before germiuation yet in the long run there is little difference 
between treated and untreated seeds. Germination tests carried on 
at the same time show that kerosene kills some of the seeds, so this 
would at least offset any benefits which might possibly be derived by 
protection. 
KEROSENE EMULSION. 
As the pure kerosene showed a weak tendency to keep the wu-e- 
worms away temporarily it was thought that if some distasteful sub- 
stance w^ere mixed with it the combination of the two might be more 
successful. To this end kerosene emulsion was prepared by using 
whale-oil soap. The seeds were soaked in this overnight and then 
