. Insect pests of farm, garden and orchard . he leaves. 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 larvse become full grown about thefirst of August. They are readily recognized by the peculiar * Papaipema nitella Gn. Family Noctuidce. 288 INSECT PESTS OF FARM, GARDEN AND
. Insect pests of farm, garden and orchard . he leaves. 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 larvse become full grown about thefirst of August. They are readily recognized by the peculiar * Papaipema nitella Gn. Family Noctuidce. 288 INSECT PESTS OF FARM, GARDEN AND ORCHARD markings of the body (Fig. 211, b). The larva is about an inchlong and varies from purplish to whitish brown, and is markedwith five white stripes, one along the middle of the back, and twoon each side. These sides stripes are 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 ready to pupate the larva cuts a. Fig. 211.—The stalk-borer {Papaipema nitella Gn.): a, adult; b, half-grownlarva; c, mature larva in burrow; d, side of one of its segments: e,pupa—all slightly enlarged. (From Chittenden, U. S. Dept. Agr.) hole through the side of the stalk, and then transforms to thebrown pupa in the lower part of the stalk. The pupal stage lastsabout two or three weeks, and the moths emerge in late August,there being but one generation a year. Usually the injury to crops is only in the outer rows, to 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 INJURIOITS TO POTATOES AND TOMATOES 289 Control.—Fiom llic lite liisloiv ami habits i( is obx-ious tliatfleaii farniiiii;- is the cnly iiicthod of effectual control. Thedestruction of weeds and fall plowing should prevent any generalinjury. Usually th
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