Insects injurious to fruits . nce of the larva of the red-necked Agrilus. The swollenportions are not smooth, as thehealthy ones are, but have thesurface roughened with numer-ous brownish slits and ridges,and when the ridges are cut intowith a knife, there will be foundunder each of them the passage-way of a minute borer, andeither in the channel or in thesoft substance adjoining, the larvawill usually be found. Fig. 317represents the nearly full-grownlarva magnified, the hair-line atthe side indicating its naturalsize. Its body is almost thread-like, and of a pale-yellowish or whitish color,
Insects injurious to fruits . nce of the larva of the red-necked Agrilus. The swollenportions are not smooth, as thehealthy ones are, but have thesurface roughened with numer-ous brownish slits and ridges,and when the ridges are cut intowith a knife, there will be foundunder each of them the passage-way of a minute borer, andeither in the channel or in thesoft substance adjoining, the larvawill usually be found. Fig. 317represents the nearly full-grownlarva magnified, the hair-line atthe side indicating its naturalsize. Its body is almost thread-like, and of a pale-yellowish or whitish color, with the ante-rior segments enlarged and flattened. The head is small andbrown, the jaws black, and the tail is armed with two slender,dark-brown horns, each having three blunt teeth on the inneredge. When full grown, it measures about six-tenths of aninch long. While young it inhabits chiefly the sap-wood,and, following an irregular, spiral course, frequently girdlesand destroys the cane; usually several larvae will be found. 308 INSECTS INJURIOUS TO THE RASPBERRY. Fig. 318.
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Keywords: ., bookauthorsaunderswilliam183619, bookcentury1800, bookdecade1880
