. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SEASONAL. STUDIES OF INSECT CONTROL. 19 Tabic V was based, as may bo seen, uj)()n the examination of 9,256 weevil stages, of which 1,926 were killed by climate, 1,067 by pred- ators, and 576 by parasites. In other words, the insect enemies killed per cent, of which per cent were killed by predators and per cent by parasites. July and August are the principal months for attack upon hanging bolls. Summarizing the four preceding tables. Table VI is i)resentc(l to show the monthly rate of mortality i
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SEASONAL. STUDIES OF INSECT CONTROL. 19 Tabic V was based, as may bo seen, uj)()n the examination of 9,256 weevil stages, of which 1,926 were killed by climate, 1,067 by pred- ators, and 576 by parasites. In other words, the insect enemies killed per cent, of which per cent were killed by predators and per cent by parasites. July and August are the principal months for attack upon hanging bolls. Summarizing the four preceding tables. Table VI is i)resentc(l to show the monthly rate of mortality in all classes of infested Fig. 1.—Diagram illustrating the monthly percentage uf mortality of immature boll weevils due to insect enemies. (Original.) It will be noticed that in each year certain months have been omitted and it must be explained that the reason therefor has been the necessity of making these examinations only when other work was not pressing. An anal3^sis of this table is more readily made by reference to the accompanying diagram (fig. 1), wliich demonstrates conclusively that August is the month during wliich the insect enemies of the boll weevil are most 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: 1828px × 1367px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
