. Insect pests of farm, garden and orchard . - machinist. The Imported Cabbage Worm * Probably the worst pest of the cabljage and one of the best-known garden insects is the common cabbage worm, whose parentis the common white butterfly. It is an old European pest andwas imported near Quebec, Canada, about 1860, whence it spreadto New England, reached New York in 1S6S, Cleveland, Ohio, by1875, and the Gulf States by 1880, and has since spread to all partsof the country. The butterfhes are among the first to emerge in early are white, marked with black near the tip of the fore-wings
. Insect pests of farm, garden and orchard . - machinist. The Imported Cabbage Worm * Probably the worst pest of the cabljage and one of the best-known garden insects is the common cabbage worm, whose parentis the common white butterfly. It is an old European pest andwas imported near Quebec, Canada, about 1860, whence it spreadto New England, reached New York in 1S6S, Cleveland, Ohio, by1875, and the Gulf States by 1880, and has since spread to all partsof the country. The butterfhes are among the first to emerge in early are white, marked with black near the tip of the fore-wings,which expand nearly 2 inches. The female bears two black spots * Pontia rapoe Linn. Family Pieridoe. See F. H. Chittenden, Circular 60,Bureau of Entomology, U. S. Dept. Agr. 356 INSECT PESTS OF FARM, GARDEN AND ORCHARD on each fore-wing, while the male has only one, and both sexes havea black spot on the anterior margin of the Fig. 256.—^The cabbage butterfly (Pontia rapce Linn.): larva; b, ;c, male butterfly; d, female butterfly. (After C. M. Weed.) Life History.—The butterflies soon commence to lay their eggson whatever food-plant is available. The larvae feed on all of the INJURIOUS TO CABBAGE AND CRUCIFEROUS CROPS 357 common cultivated crucifers as well as man} wild sorts, so that thespecies is never without food. The small yellowish, oval eggs arelaid on end on the foliage, and are marked with prominent longi-tudinal ridges. They hatch in from four to eight days. The larvaegrow very rapidly, gorging themselves on the foliage, which theyskeletonize in their well-known manner, and become full grown infrom ten days to two weeks. The mature cabbage worm is about1^ inches long, of a velvety green color, very similar to the foliage,with a faint }-ellow stripe down the middle of the back and a rowof yellow spots one each side. The surface, when seen under alens, is finely roughened and dotted wi
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
