37 
Fig. 32.—Caradrma exigua: a, moth; h, larva, lateral 
view; c, larva, dorsal view; d, head of larva; e, egg, 
viewed from above;/, egg, from side — all enlarged (e,/, 
after Hofmann; a-d, after Chittenden, Division of 
Entomology). 
develop as early as the last week of May and a month later in June. 
In the cooler climate of Colorado and New Mexico larv{» have been 
noticed about the middle of June, becoming more abundant in August, 
when the greatest damage is done. From our somewhat incomplete 
knowledge of this species it appears that it has a spring and late 
autumn generation in Colo- 
rado and New Mexico, and 
perhaps a third in southern 
California, and it is evident 
that the second generation is 
generally most destructive." 
Methods of control. — Sev- 
eral remedies have been 
employed in Colorado with 
satisfactory results. These 
include Paris green and kero- 
sene emulsion, both of which 
killed the insects and checked 
their numbers for the follow- 
ing year. Paris green was 
applied as a spray and dry, 
mixed with Hour. With flour 
it cost about 80 cents an acre. 
Two sprayings with the liquid preparation were most effectual. When 
this species is unduly abundant it should be treated in the same manner 
as the fall army worm {Laphygma fruglperda 
S. & A.), which is quite often associated with in- 
jury to sugar beet. The latter attacks nearly all 
forms of vegetable and other crops, but as it is dis- 
cussed full}^ in Bulletin 29, new series, Division of 
Entomology, further mention is unnecessary here. 
A third species, the true army worm {Leucania 
unipuncta Haw.), is more strictly an enemy of 
cereals and grasses, and not, as a rule, of much 
importance as a beet feeder. Remedies are considered in Circular No. 
4, Division of Entomology, and short general accounts of both the 
true army worm and the fall army worm are furnished in Farmers' 
Bulletin 132. 
WEBWORMS. 
Among insects that are nearly always to be found in their natural 
habitat in fields of beets are two small caterpillars known as web- 
worms. Of these the sugar-beet webworm is a prime beet pest, and 
the second, known as the garden webworm, is a general feeder, devel- 
«In a more complete consideration of this species, Bui. 33, new series, Div. Ent., 
pp. 37-46, references to economic articles by C. P. Gillette and others are furnished. 
Fig. 33. — Caradrina exigua: 
enlarged section of first 
proleg segment, dorsal 
view (original. Division 
of Entomology). 
