PROGRESS REGARDING SUGAR-BEET WEBWORM. 
63 
OTHER CHECKS. 
As previously noted, the webworms burrow into the soil about 
the infested plants, and when the beets are plowed out at harvest 
time many of the worms are crushed or are so deeply buried that 
the moths, if they succeed in developing, are unable to leave the 
tubes, and consequently perish. In spite of these checks there will 
be every year some areas of greater or less extent where the web- 
worms will occur in injurious numbers and where spraying or other 
artificial control measures will be necessary. 
Fig. 14. — Field of young sugar beets destroyed by tlie sugar-beet webworrn in late June. 
(Original.) 
EXPERIMENTS WITH REMEDIES. 
During the time the writer has been stationed in the Arkansas 
Valley he has given special attention to means of controlling this 
webworrn, and in his opinion spraying with Paris green has proven 
by far the most effective and satisfactoiw remedy. The writer has 
made many experimental tests with a variety of insecticides and 
has also supervised a considerable amount of practical work against 
this species, as a result of which study he considers the following 
formulas as most efficient : 
Form ilia No. /. 
Paris green pounds 3 
Whale-oil soap do G 
Water gallons__ 100 
Formula Xo. 2. 
Paris green '. pounds 3 
Lime do 3 
Water gallons.. 100 
