Insect pests of farm, garden and orchard . ols are for sale l)y dealers in agricul-tural implements in France, and miglit l)e made l\v any machinist. The Imported Cabbage Worm * Probably the worst pest of the cabbage and one of the best-known garden insects is the common cabbage woi-m, whose parentis the common white butterfly. It is an old European pest andwas imported neai (jjuebec, Canada, about 1S60, whence it spreadto New England, reached Xew York in ISGS, Cleveland, Ohio, by1S7), and the Gulf States l)y ISSO, and has since spread to all partsof the country. The l)utterflies are among the
Insect pests of farm, garden and orchard . ols are for sale l)y dealers in agricul-tural implements in France, and miglit l)e made l\v any machinist. The Imported Cabbage Worm * Probably the worst pest of the cabbage and one of the best-known garden insects is the common cabbage woi-m, whose parentis the common white butterfly. It is an old European pest andwas imported neai (jjuebec, Canada, about 1S60, whence it spreadto New England, reached Xew York in ISGS, Cleveland, Ohio, by1S7), and the Gulf States l)y ISSO, and has since spread to all partsof the country. The l)utterflies are among the fiist to emerge in early are white, marked with l>lack near the tip of the fore-wings,which expand nearly 2 inches. The female l;ears two black spots * Pontiu rapae Linn. Family Pieridw. See F. H. Chittenden, Circular60,Bureau of Ent( molugy, U. S. Depl. \^r. 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 Pontii ra-pcp Linn.): - larva; b, chrysalisc, 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 larva? feed on all of the INJURIOUS TO CABBAGE AND CRUCIFEROUS CROPS 357 common cultivated crucifers as well as many 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 larva?grow 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 aboutl{ inches long, of a velvety green color, very similar to the foliage,with a faint yellow stripe down the middle of the back and a rowof yellow spots one each side. The surface, when seen under
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1912
