. The Bulletin of the North Carolina Department of Agriculture. Agriculture -- North Carolina. 46 The Bulletin. and grow entirely within the boll in which they are hatched. When full grown these larvse are of the size shown to the left in Fig. 20, never more than one-half inch in length, and white in color. In Fig. 21 may be seen, natural size, several steps in the develop- ment of the larvae and its transformation to the adult weevil condi- tion. The young, newly-hatched larva is shown at a, and a later stage of its growth is shown at b. When it gets full grown it changes to the pupa shown in
. The Bulletin of the North Carolina Department of Agriculture. Agriculture -- North Carolina. 46 The Bulletin. and grow entirely within the boll in which they are hatched. When full grown these larvse are of the size shown to the left in Fig. 20, never more than one-half inch in length, and white in color. In Fig. 21 may be seen, natural size, several steps in the develop- ment of the larvae and its transformation to the adult weevil condi- tion. The young, newly-hatched larva is shown at a, and a later stage of its growth is shown at b. When it gets full grown it changes to the pupa shown in the square of c. From this it changes again to the adult beetle (Figs. 19 and 22) which provides for another generation and then dies. By preference, the eggs are laid in the buds or squares, and it is only in late summer and fall that they are laid in the bolls to any con- siderable Fig. 21. -Showing development of Boll-weevil, a, Young larva in young square ; 6, larva nearly grown in square ; c, pupa, still inside square. All natural size. (After Howard, Bur. Ent., U. S. Dept. Agr.) When the squares are punctured and eggs laid in them they al- most invariably become weakened and drop off. Squares are often shed even when not infested, so the shedding alone is not an indica- tion of the presence of the weevil. When the bolls are infested they do not ordinarily drop. Instead, they may continue to grow until about mature, but they do not open properly, so that it is not practicable to get the cotton by ordinary means. They are apt to be stunted, dwarfed and misshapen, so that they are valueless, but they do not drop. From this account it will be seen that the entire life of the in- sect is such that it is not much exposed either to the attacks of birds or other enemies or the application of remedies. Indeed, the general life-history is very similar to that of the Strawberry-weevil,. Please note that these images are extracted from scanned page images that may have been
Size: 1577px × 1584px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcollectionbiodiversity, bookcollectionnybotani, bookyear1907
