Insect pests of farm, garden and orchard . ves. In a few days they work down to the basesof the leaves and enter the stalks, which they tunnel out and notinfrequently leave one plant and migrate some little distancebefore entering another. Infested plants are readily recognizedby the wilting of the parts above the larva, the work in cornbeing particularly noticeable and having given the local nameof heart-worm. The larvae become full grown about thefirst of August. They are readily recognized by the peculiar * Papaipema nitella Gn. Family NoctuidcB. 288 INSECT PESTS OF FARM, GARDEN AND ORCHARD
Insect pests of farm, garden and orchard . ves. In a few days they work down to the basesof the leaves and enter the stalks, which they tunnel out and notinfrequently leave one plant and migrate some little distancebefore entering another. Infested plants are readily recognizedby the wilting of the parts above the larva, the work in cornbeing particularly noticeable and having given the local nameof heart-worm. The larvae become full grown about thefirst of August. They are readily recognized by the peculiar * Papaipema nitella Gn. Family NoctuidcB. 288 INSECT PESTS OF FARM, GARDEN AND ORCHARD iiiarkiiigs of the body (Fig. 211, h). The larva is aljoui an inchlong and varies from purplish to whitish bi-own, and is markedwith five white stripes, one along the middle of the back, and twoon each side. These sides stripes arc absent on the first foursegments of the abdomen, giving the larva an appearance as ifit had been pinched or injured there. As the larva matures thestripes become fainter. When reatly to pupate the larva cuts a. IKi. 211.—Tilt stalk-horor {Pafxiipeinu nltelUt Cin.): a, adull; 6, lialf-f^rowalarva; c, mature larva in burrow; d, side of ou(\ of its .segments: c,pupa—all slightly enlargetl. (From Chittenden, U. S. Dcpt. Agr.) hole through the sid(> of the stalk, and then Iraiisforms to thebrown pui)a in the lower part of the stalk. The i)ui)al stage lastsabout two or three weeks, and the moths emerg(> in late August,there being but one generation a year. Usually the injury to crops is only in the outer rows. t(j whichthe larvae have migrated from weeds growing along the edges,or in fields which have been weedy in early spring, or where theweeds have been allowed to get a start before being culti-vated out. INSECTS INJURIOUS TO POTATOES AND TOMATOES 280 Control.—From the life history and habits it is obvious thatclean farming is the only method of effectual control. Thedestruction of weeds and fall plowing should prevent any generalinjury. Us
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