22 BULLETIN 1032, U. S. DEPARTMENT OE AGRICULTURE. 
time throughout the summer. The ladybird beetles, with few excep- 
tions, are beneficial insects; the adults of this species have been 
observed to feed readily on the larvae of the blackhead fireworm in 
captivity, and in the field doubtless consume large numbers of this 
insect. 
CONTROL EXPERIMENTS. 
Since most of the cranberry bogs on the Pacific coast can not be 
provided with a sufficient supply of water for use in control work, 
insect pests on these bogs should be combated largely by the applica- 
tion of insecticides in the form of a liquid spray. This method seems 
especially desirable against the fireworm after a study of its habits 
and methods of feeding. It may also be necessary to do more or less 
spraying for certain fungous diseases at various times throughout 
the season, and some of the dates for these applications may corre- 
spond to a great extent with the time of application in the control 
of the fireworm. The grower, therefore, can combine the materials 
used for the control of the fireworm with those necessary for fungous 
diseases whenever- the times for these two applications coincide, and 
thus save the expense of separate applications. 
All the control experiments against the blackhead fireworm were 
arranged, therefore, so as to include tests under actual bog conditions 
of several methods of spraying the eggs, larvae, and adults with a 
number of promising insecticides, both with and without spreaders, 
at various times throughout the season. These sprays were applied 
by the types of nozzles shown in figures 12. 13. and 14. all the tests 
being so planned as to shed some light on questions concerning the 
number of applications, the best materials to be used, the amount of 
spray material which should be used per acre, and the most effective 
manner of applying it. 
MISCELLANEOUS SPRAYING EXPERIMENTS. 
In Table 3 is given an outline and the results of the miscellaneous 
spraying experiments conducted on Howe vines on the Portland- Sea- 
view Cranberry Co. bog at Sea view, Wash., in 1919. Very similar 
experiments were performed on this bog in 1918, but the severe infes- 
tations previous to that season had so reduced the bearing power of 
the vines that few blossoms were set in 1918, and the results therefore 
were not wholly dependable. They showed, however, a decided in- 
crease in control by the use of insecticides combined with spreaders, 
such as soap or glue, as compared with the same insecticides applied 
without the addition of these wetting agents. They also suggested 
that a solution of 40 per cent nicotine sulphate, used at the rate of 1 
part to 1,000 parts of water, with the addition of fish-oil soap at the 
rate of 2 pounds to 50 gallons and applied at the rate of about 300 
fr 
