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 . ured 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
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 . ured 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 excep-tion of a spot on the shoulders and the legs, which are black andyellowish, and the eyes which are reddish brown. EEMEDIES. Since the insect winters in the stubble the remedy is burning the stubble at any time during fall, winter, or springbefore the 1st of March, all the insects will be destroyed. The Wheat Straw Worm, Isosoma tritici, Riley. A second species of these hymenopterous enemies of smallgrain is figured herewith. It differs somewhat from the preced-ing in its mode of attack, as well as in habits and life history. 218 INSECT ENEMIES OF SMALL Fig. 18—Wheat plantshowing work of Isos-oma hordei. — [AfterWebster.] Fig. 17.—Wheat plant show-ing work of Isosoma hordei.—[After Webster.] INSECT ENEMIES OF SMALL GRAINS. 219 Prof. F. M. Webster has recently studied these wheat-steminsects and sums up as follows when speaking of tritici: It
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1894
