. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCR II'I'ION OF COMMON INSKCTS 26 r Pupa.—Pu[)a-aise translucent pale green; pupa greenish and % inch long. 7^r^w/. Probably three generations occur each season. The eggs are laid in September October on fall wheat. The maggols eat down into the stem where they remain all winter. In early spring they assume the pupal stage, and about the first of June the adult flies ap[)ear. This brood matures about August ist, when flies again appear. This third generation ma-
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCR II'I'ION OF COMMON INSKCTS 26 r Pupa.—Pu[)a-aise translucent pale green; pupa greenish and % inch long. 7^r^w/. Probably three generations occur each season. The eggs are laid in September October on fall wheat. The maggols eat down into the stem where they remain all winter. In early spring they assume the pupal stage, and about the first of June the adult flies ap[)ear. This brood matures about August ist, when flies again appear. This third generation ma- tures at the iir\i\ of Sej)tember and the beginning of October, when the adult flies escape to lay their eggs. Besides wheat, rye, barley, and oats, this insect attacks timothy, couch grass, Rlymus, Poa^ and green foxtail. Control.—-Grain stacked or threshed; straw stacked or burned; burning of stubble when practicable. Meromyza ni^riventris Macq. and Cerodonlha femoralis Meig. have been recorded as doing injury in Montana. American Grass Stem Maggot {Oscinis carbonariahoew.). Adult.— A black or yellowish fly, resembling a minute house-fly, |f 5 inch long. Larva.—A yellowish-wh i te slender maggot with two distinct p,^^ wheat stem maKKol: hook-like jaws and two knob-like «. adult; b, maggot; c, pupa; d, pupa .11. i r^i within the stem; c, parasite. (After processes on the last segment of the / „„„g^ . • i body; j/f2 J^ch long. Pupa. F*upa-case cigar-sha[)erl and j)ale chestnut brown. Broods. Similar in life-history to Wheat Stem Maggot. The larva destroys the centre of the young shoot at the ground in the autumn. Other Species.—0. coxendix T^oivv. and O. dorsala Loew. occur on prairie grasses, sometimes very 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, Wil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
