. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. NATURAL ENEMIES. 39 alfalfa weevil the possibility of permanent establishment and future efficiency in the case of these species seems rather more encourag- ing than in case of the others. During June, 1911, 40 individuals reared from imported cocoons were placed in field cages artificially overstocked with weevil larvae, the cage covers being removed later. Besides this, there is at present on hand a considerable amount of hibernating material (PL XII, figs. 1, 2) artificially reared in the Murray laboratory (PL
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. NATURAL ENEMIES. 39 alfalfa weevil the possibility of permanent establishment and future efficiency in the case of these species seems rather more encourag- ing than in case of the others. During June, 1911, 40 individuals reared from imported cocoons were placed in field cages artificially overstocked with weevil larvae, the cage covers being removed later. Besides this, there is at present on hand a considerable amount of hibernating material (PL XII, figs. 1, 2) artificially reared in the Murray laboratory (PL XIII, fig. 2), which will be allowed to escape, naturally, into the alfalfa Fig. 25.— Canidiella curculionis, a parasite of the alfalfa weevil: Adult female; lateral view of abdomen of same below, at right. Enlarged. (Original.) The parasite Itoplectis masculator Fab. (fig. 26) differs from the preceding by reason of the fact that it pupates entirely within the pupa of its host. It is known to be a primary parasite, but the num- ber so far secured is too limited to warrant any discussion regarding it, or any predictions as to its future in America. Of the eighth and last of these parasites, Hemiteles sp., very little is known either in Europe or America, and with the obscurity surround- ing its habits it may prove to be either a primary or secondary parasite, a friend or an enemy of the others. It is therefore being handled with the utmost caution, none having been liberated either in the fields or in field 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 United States. Bureau of Entomology. Washington : G. P. O.
Size: 1653px × 1512px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
