. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. THE SOUTHERN CORN ROOTWORM, OR BUDWORM. By F. M. Webster, In Charge of Cereal and Forage Insect Investigations. DISTRIBUTION. The parent of the southern corn rootworm (Diabrotica duodecim- piinctata Oliv.), or, as it is often termed, the budworm, is a yellow or greenish-yellow beetle having 12 black spots on the back, as shown in figure 1, • a, from which its specific name, meaning " 12-spotted," is derived. It is closely allied to the almost equally common striped cucumber beetle {Dia- brotica vittata Fab.),
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. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. THE SOUTHERN CORN ROOTWORM, OR BUDWORM. By F. M. Webster, In Charge of Cereal and Forage Insect Investigations. DISTRIBUTION. The parent of the southern corn rootworm (Diabrotica duodecim- piinctata Oliv.), or, as it is often termed, the budworm, is a yellow or greenish-yellow beetle having 12 black spots on the back, as shown in figure 1, • a, from which its specific name, meaning " 12-spotted, " is derived. It is closely allied to the almost equally common striped cucumber beetle {Dia- brotica vittata Fab.), and also to the parent of the even more de- structive western corn rootworm (Diabrotica lonc/icornis Say). Throughout the coun- try east of the Rocky Mountains, extending from southern Canada southward to North Carolina, Tennessee, Arkansas, and Oklahoma, these 12-spotted and striped beetles to- gether frequent squashes and pumpkins, often collecting in num- bers in the blossoms. The 12-spotted species during late summer and fall also frequents, often in conspicuous numbers, the flowers of the various species of goldenrod (Solidago). The larvae (fig. 1, c) do not generally attack growing corn in suf- ficient numbers to cause any considerable injury, except perhaps. Fig. 1.—The southern corn rootworm (Diabrotica cluo- decimpunctata) : a. Beetle; b, egg; c, larva; d, anal segment of larva ; e, work of larva at base of corn- stalk ; /, pupa. All much enlarged, except e, reduced. (Reengraved after Riley, except f, after Chittenden.) 6134 < -13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.