. The corn root-worms. Corn root-worm; Spotted cucumber beetle; Western corn rootworm; Agricultural pests. THE SOUTHERN CORN ROOT-WORM. {Diabrotica 12-punctata 01.) This species is also known in the South as the "bud-worm " and less commonly as the " drill ; In some regions it is recognized only by the former name, while the latter is of more recent use. The beetle is familiar to most persons in its occurrence on cucumber, squash, and other cucurbits. It frequents the flowers, and by peeping into them one or more beetles and the places where they have gnawed the petals
. The corn root-worms. Corn root-worm; Spotted cucumber beetle; Western corn rootworm; Agricultural pests. THE SOUTHERN CORN ROOT-WORM. {Diabrotica 12-punctata 01.) This species is also known in the South as the "bud-worm " and less commonly as the " drill ; In some regions it is recognized only by the former name, while the latter is of more recent use. The beetle is familiar to most persons in its occurrence on cucumber, squash, and other cucurbits. It frequents the flowers, and by peeping into them one or more beetles and the places where they have gnawed the petals may be seen, for they are among the most omnivorous of insects and appear to be able to subsist on any form of vegetation on which they may happen to alight. They are, in fact, to be found in practically all fields of corn and in gardens everywhere, but it is seldom that the larvae are associated with the beetles except by those well versed inentomol- og3^ or who have had experience with both forms of insects. The species is best known northward as the twelve-spotted cucum- ber beetle. DESCRIPTIVE. This insect has four stages, adult or beetle, egg, larva, and pupa. Fig. 1.—Southern corn root-worm {Diabrotica 12-p%inctata): a, rp~i h fl ' l beetle;'6, egg; c, larva; d, anal segment of larva; e, work of larva 1,ie oeelie 1S elong- at base of cornstalk ; f, pupa—all much enlarged except e. which ate pvriform, yellowish is reduced (reengraved after Rilev. except f, after Chittenden). • -, -, ,, green in color, and the elytra or wing-covers are marked with twelve black spots (fig. 1, a). The head is black, as are also the legs, except portions of the femora or thighs. The length is one-fourth of an inch or a little longer. The egg {b) does not differ materially from that of related species, such as the striped cucumber beetle, except in size. It is broadly oval in shape, measuring in the average inch in length. The color is dull yellow, and the surface is closely and so
Size: 1751px × 1428px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedstatesbureauofe, bookcentury1900, bookdecade1900
