A preliminary introduction to the study of entomologyTogether with a chapter on remedies, or methods that can be used in fighting injurious insects; insect enemies of the apple tree and its fruit, and the insect enemies of small grains . Fig. 15.—Cephus occidentalis: a, larva; b, imago, female; c,base of grass gtalk showing excavation of larva—all enlarged.[Insect Life.] INSECT ENEMIES OF SMALL GRAINS. THE WHEAT JOINT-WOEM. 217. Fig. 16.—Isosoma hordei: a, wheat strawsshowing injury; 6, female insect.—[After Eiley.] {Isosoma hordei Harr.)By refereuce to figure 16 the reader will see illustrate
A preliminary introduction to the study of entomologyTogether with a chapter on remedies, or methods that can be used in fighting injurious insects; insect enemies of the apple tree and its fruit, and the insect enemies of small grains . Fig. 15.—Cephus occidentalis: a, larva; b, imago, female; c,base of grass gtalk showing excavation of larva—all enlarged.[Insect Life.] INSECT ENEMIES OF SMALL GRAINS. THE WHEAT JOINT-WOEM. 217. Fig. 16.—Isosoma hordei: a, wheat strawsshowing injury; 6, female insect.—[After Eiley.] {Isosoma hordei Harr.)By refereuce to figure 16 the reader will see illustrated a small four - winged insectenemy of small grainstogether with its modeof attack. It is whatentomologists know asthe Wheat Joint-worm, originally de-scribed by Harris. Itis quite destructivein some parts of thecountry. The female lays hereggs in the wheat stemnear the joints. These hatch into larva which are yellowish-white with brown-tipped jaws, similar in form to those of thenext species, which are figured in 19 a, b. Then, by their pres-ence in the plant, cause a more or less abnormal growth in thestraw near the joints as shown in figure 16 a. So far as is knownthis insect is single brooded, the larva hibernating in the stubbleand transforming the following spring. The mature insect whichis quite small, the size being represented in figure 16 by hairlines at left of the figure of the insect, is black with the e
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1894
