1927] 
Control of European Vine-moths 
155 
dosage and exposure resulting in 100% mortality to the insects 
when accompanied by favorable climatic conditions, as shown 
by these tests. 
Exposures (in hours) 
1 
5 
3 
4 
1 
u 
2 
to 
3 
1% 
^ 1-5% 
E 
| 2% 
X 
fe? 2.5% 
X 
3 (in 
00 
1 S3 
! 
X 
o 3.5% 
C 
X 
Dos 
S3 
4.5% 
5% 
X 
(Note: x signifies 100% kill of insects fumigated; e. g., a 3% volume 
treatment for a period of l \ hours resulted in a complete kill of the pupae 
exposed to the treatment.) 
The following conclusions are presented only because they 
throw some light on the possibilities of the use of calcium 
cyanide for the control of these pests. However, it must 
not be forgotten that they are the results of only a few pre- 
liminary experiments. 
Conclusions 
1. Treatments of Cochylis and Eudemis with dosages 
between 2% volume and 3.5% volume during exposures of 
from one to two and a half hours give better kills than stronger 
dosages over shorter exposures, or weaker dosages over longer 
periods of fumigation. 
2. Temperatures above 60° F. appear to be more effective. 
3. High relative humidity does not appear to be so im- 
portant a factor as high temperature. 
