. Insect pests of farm, garden and orchard . Tobacco-worms * Of all the insects feeding upon tol)acco, the Hornworms arethe most widely injurious and therefore best known. The cater-pillars of two species of moths are commonly included under thigpopuhir name, both species occurring throughout the tobacco-growing States, the northern tobacco-worm being more commonin the North and the southern tobacco-worm more common in theSouth. The differences in the adult moths may be readily appre-ciated from Figs. 162 and 163, the southern form being darker andwith brighter orange spots on the abdomen, and
. Insect pests of farm, garden and orchard . Tobacco-worms * Of all the insects feeding upon tol)acco, the Hornworms arethe most widely injurious and therefore best known. The cater-pillars of two species of moths are commonly included under thigpopuhir name, both species occurring throughout the tobacco-growing States, the northern tobacco-worm being more commonin the North and the southern tobacco-worm more common in theSouth. The differences in the adult moths may be readily appre-ciated from Figs. 162 and 163, the southern form being darker andwith brighter orange spots on the abdomen, and the white lines on * Phlegethontius quinquemaculata Haworth (Northern), and P. sexiaJohanssen (Southern). Family Spfiingidce. INSECTS INJURIOUS TO TOBACCO 229 the hind-wings being less distinct. The larva? of both speciescommonly attack tomato vines and arc commonly called tomatoworms where tobacco is not grown. Life History.—The pupie pass tlu^ winter several inches belowthe surface of the soil and from them the moths emerge in May and. Fig. 162.—Northern tobacco-worm, or hornworm (Phlegethontius quinque-maculala): c, adult moth; 6, full-grown larva; c, pupa—natural size.(After Howard, U. S. Dept. Agr.) June, according to the latitude and season. The females deposittheir eggs singly, upon^ the lower surfaces of the leaves, from whichthe little caterpillars hatch in from four to eight days. The char-acteristic work of the larvie is too well known to every tobaccogrower to necessitate description. The caterpillars become fullgrown in about three weeks, during which time they moult somefive times. The full grown larva? are three to four inches long, of 230 INSECT PESTS OF FARM, GARDEN AND ORCHARD a dark green color with white stripes on the side of the body, thoseof the northern species having a V-shape, while those of the south-ern species being simple oblique hands. At the tip of the al)domenis a stout horn, from which is derived the name of hornworm,which in the norther
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