. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 32.—Caradrina 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 {c,f, after Hofmann; a-d, after Chittenden, Division of Entomology). develop as earl}" as the last week of May and a month later in June. In the cooler climate of Colorado and New Mexico larva> 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
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 32.—Caradrina 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 {c,f, after Hofmann; a-d, after Chittenden, Division of Entomology). develop as earl}" as the last week of May and a month later in June. In the cooler climate of Colorado and New Mexico larva> 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 ; Methods of control.—Sev- eral remedies have l^een 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 3'ear. 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 lie treated in the same manner as the fall arni}^ worm {Laphygma fnigiperda 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 fully in Bulletin 29, new series. Division of Entomology, further mention is unnecessary here. A third species, the true army worm {Leucania unipimcta 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 arni}^ worm and the fall army worm are furnished in Farmers' Bulletin 132. WEBWORMS. Among insects that
Size: 2078px × 1202px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectentomology, booksubjectinsects, booky
