. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 276 ECONOMIC ENTOMOLOGY Dep. Agr. Canada, 1916; Bull. 419, N. Y. Agr. Exp. Stn.; Cornell Univ., Bull. 78.) Onion Maggot {Phorbia ceparum Mg. = Hylemyia antiqua Mg.). Adult.—Slightly larger than Cabbage Root Maggot Fly; body and legs with many black bristles; back of thorax of male with four indistinct dark colored bands; abdomen with a distinct blackish band down the middle; May-June. Probably three broods a year. Pre-
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 276 ECONOMIC ENTOMOLOGY Dep. Agr. Canada, 1916; Bull. 419, N. Y. Agr. Exp. Stn.; Cornell Univ., Bull. 78.) Onion Maggot {Phorbia ceparum Mg. = Hylemyia antiqua Mg.). Adult.—Slightly larger than Cabbage Root Maggot Fly; body and legs with many black bristles; back of thorax of male with four indistinct dark colored bands; abdomen with a distinct blackish band down the middle; May-June. Probably three broods a year. Pre-oviposi- tion period about 10 days (Fig. 180).. Fig. 179.—Onion maggot {Phorbia ceparum), female and head of male. Eggs.—Cylindrical, white, distinctly ridged; groove not so deep or long as in P. brassicce; duration 3 to 4 days. Larva.—White, cylindrical, rounded, truncate at posterior end; ^:5 inch long; central tubercles of blunt end single-pointed, with a pair of additional tubercles. Duration 2-3 weeks, occasionally 4-5 weeks. Young larva works its way down within the sheath of the plant to the forming bulb, in which it feeds. Pupa.—Puparia formed in soil or in outer layers of onion. Found i/^~3 inches below the surface. Summer duration about 2 weeks; 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 Lochhead, William, 1864-1927. Philadelphia : Blakiston
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
