. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. ATTACKING THE CANES. 307 Fig. 316. No. 177.—The Red-necked Agrilus. Agrilns ruflcoUis (Fabr.). In the spring-time, when raspberry and blackberry canes are being pruned, they will often be observed swollen in places to the length of an inch or more, in the manner shown in Fig. 316. This swelling is a pithy gall, and has been named the Raspberry Gouty-gall, JRubi podagr^a Riley, and is produced by the irritation caused by the presence of the larva of the red- necked Agrilus. The swollen portions are n
. Insects injurious to fruits. Illustrated with four hundred and forty wood-cuts. Insect pests. ATTACKING THE CANES. 307 Fig. 316. No. 177.—The Red-necked Agrilus. Agrilns ruflcoUis (Fabr.). In the spring-time, when raspberry and blackberry canes are being pruned, they will often be observed swollen in places to the length of an inch or more, in the manner shown in Fig. 316. This swelling is a pithy gall, and has been named the Raspberry Gouty-gall, JRubi podagr^a Riley, and is produced by the irritation caused by the presence of the larva of the red- necked Agrilus. The swollen portions are not smooth, ^s the healthy ones are, but have the surface roughened with numer- ous brownish slits and ridges, and when the ridges are cut into with a knife, there w^ill be found under each of them the passage- way of a minute borer, and either in the channel or in the soft substance adjoining, the larva will usually be found. Fig. 317 represents the nearly full-grown larva magnified, the hair-line at the side indicating its natural size. 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 and brown, the jaws black, and the tail is armed with two slender, dark-brown horns, each having three blunt teeth on the inner edge. When full grown, it measures about six-tenths of an inch long. While young it inhabits chiefly the sap-wood, and, foil )wing an irregular, spiral course, frequently girdles and destroys the cane; usually several larvae will be found. 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 Saunders, William, 1836-1914. Philadelphia, J. B. Lippincott & Co
Size: 1097px × 2278px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1883
