. Injurious insects : how to recognize and control them . Insect pests; Insect pests. GRUBS OR MAGGOTS lyjURIXG STALE OR STEM 131 The Wheat Straw-worm (Isosoma graixlc Riley) In the wheat growing regions west of the Mississippi this insect causes much damage. Its worlv is of two types. 0\erwintering, mostly wingless adults lay eggs in April in the tender tissues of young wheat ]ilants. The grubs that hatch from these feed in the crown of the plant, practically destroying it so that growth stops. .-\iter a pupal stage a second generation of adults in late !May or June emerges. These arewinged,
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. GRUBS OR MAGGOTS lyjURIXG STALE OR STEM 131 The Wheat Straw-worm (Isosoma graixlc Riley) In the wheat growing regions west of the Mississippi this insect causes much damage. Its worlv is of two types. 0\erwintering, mostly wingless adults lay eggs in April in the tender tissues of young wheat ]ilants. The grubs that hatch from these feed in the crown of the plant, practically destroying it so that growth stops. .-\iter a pupal stage a second generation of adults in late !May or June emerges. These arewinged, and are apt to disperse rather widely. The female lays eggs in the wheat stem, below the head and just abo"\"e the youngest joint that is not covered with a sheath of leaves. Larva? hatcliing from these eggs feed in the stem, and remain in the straw until the next season. The plant attacked will mature a head, but the kernels are apt to be small. Rotation is important because it will prevent damage by the first, wingless generation, which causes the more serious injury. The overwintering larva can be killed by burning or otherwise disposing of the straw and stubble. The Wheat-stem Maggot (Meroinijza americana Fitch) The e^^dence of the presence of the wheat-stem maggot is a char- acteristic blanching of the heads of wheat, rye. oats, or other small. Fig. 111.— Work of Iso- soma hordci. Original. Fig. 112. — Work of the "Wheat Straw-worm. Orig- 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
