Manual of vegetable-garden insects . ya few plants are grown, hand-picking is often the cheapest andeasiest way of destroying the worms. Fiu. 5. — The imported cab-bage worm butterflies, maleabove, female below (X f). References Scudder, Butterflies of Eastern U. S., 2, pp. 1175-1190; 1205-1218. S. Bur. Ent. Giro,. 60. S. Farm. Bull. 766. 1916. INJURIOUS TO CABBAGE AND RELATED CROPS The Potherb Butterfly Ponlia oleracen Harris Before the introduction of the imported cabbage butterfly,this species was abundant in the northern Inited States andCanada east of the Rocky INIoun-tain
Manual of vegetable-garden insects . ya few plants are grown, hand-picking is often the cheapest andeasiest way of destroying the worms. Fiu. 5. — The imported cab-bage worm butterflies, maleabove, female below (X f). References Scudder, Butterflies of Eastern U. S., 2, pp. 1175-1190; 1205-1218. S. Bur. Ent. Giro,. 60. S. Farm. Bull. 766. 1916. INJURIOUS TO CABBAGE AND RELATED CROPS The Potherb Butterfly Ponlia oleracen Harris Before the introduction of the imported cabbage butterfly,this species was abundant in the northern Inited States andCanada east of the Rocky INIoun-tains but soon became rarethroughout the greater part of itsrange. The caterpillar of thisspecies closely resembles that ofthe imported form but lacks theyellowish dorsal stripe. Thebutterfly has the upper surfaceof both i)airs of wings and theunder surface of the front wingsnearly pure white. The hind wings arc usually marked (jnthe underside with gray stripes extending along the the under surface is pure white (Fig. 6).. Fig. ? The potherb butter-fly (X f). References Riley, U. S. Ent. Rept. for 1883, pp. , Butterflies of Eastern U. S., 2, pp. 1191-1204. 1889. The Southern (\\bba(;e ButterflyPontia protodice Boisduval and Le Conte This cabbage-feeding caterpillar is widely distributed through-out the United States but is more common southward, where itoften causes serious injury to cruciferous crops. As in thecase of the potherb butterfly, this species has decreased innumbers and importance since the introduction of its Europeanrelative. The butterfly is known as the checkered white. Theground color of the wings is white in the male and dirty white in MANUAL OF VEGETABLE-GARDEN INSECTS the female and the upper side ofthe fore wings in both sexes ismarked with several black spots(Fig. 7). The caterpillar is aboutan inch in length, purplish greenin color marked with four longi-tudinal greenish yellow stripes andcovered with small black dots. The la
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
