. Field crops for the cotton-belt. Agriculture. 128 FIELD CROPS FOB TUk COTTON-BELT entered Louisiana in .1904, Mississippi in 1907, and Alar bama in 1910. In recent years it has spread eastward mucK more rapidly than northward. There seems to be little doubt but that within the next ten or fifteen years it will spread over the entire cotton-belt of the United States. , 149. t,ife history and habits. — There are four stages in the life history of the boll-weevil, — the egg, the larva or grub, the pupa, and the adult. The first three of these four stages are spent within the cotton square or yo
. Field crops for the cotton-belt. Agriculture. 128 FIELD CROPS FOB TUk COTTON-BELT entered Louisiana in .1904, Mississippi in 1907, and Alar bama in 1910. In recent years it has spread eastward mucK more rapidly than northward. There seems to be little doubt but that within the next ten or fifteen years it will spread over the entire cotton-belt of the United States. , 149. t,ife history and habits. — There are four stages in the life history of the boll-weevil, — the egg, the larva or grub, the pupa, and the adult. The first three of these four stages are spent within the cotton square or young tender boll. By means of the mouth parts, which are located at the'^nd of the snout, the adult weevil eats a. Fig. 19. — Showing variation in size of boll-weevils. tiny hole into the square, in which an egg is deposited. Within three or four days the egg hatches into a tiny white larva or grub. This grub feeds upon the inner tissues of the square, or the young boll as the case may be, becoming full grown within six to twelve days after hatching, pro- vided weather conditions are favorable. It is during the larva stage that the greatest damage is done. After attain- ing its normal size the larva passes into the pupa stage or'the intermediate stage between the larva and the adult. The transformation froi](i larva, to adult usually requires from three to five days after which time the adult eats its way to the outside of the square or boll. The color of the adult weevil depends upon its age. The recently. 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 Morgan, James Oscar. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
