Manual of vegetable-garden insects . er quarters inthe spring just before earlyplanted potatoes come this time they will feed on])ieces of seed potatoes left onthe surface and will some-times dig into the soil in search of the tender sprouts. Fig. 82. —The Colorado potato beetle,r,^, PIP , • 1 Pfigs and newly hatched larvae iney teed tor a tune on the (enlarged). tender foliage and then, after pairing, deposit their eggs on end in masses on the under-side of the leaves (Fig. 82). Each mass contains from fouror five to nearly seventy eggs with an average of about twenty-five. The egg is a
Manual of vegetable-garden insects . er quarters inthe spring just before earlyplanted potatoes come this time they will feed on])ieces of seed potatoes left onthe surface and will some-times dig into the soil in search of the tender sprouts. Fig. 82. —The Colorado potato beetle,r,^, PIP , • 1 Pfigs and newly hatched larvae iney teed tor a tune on the (enlarged). tender foliage and then, after pairing, deposit their eggs on end in masses on the under-side of the leaves (Fig. 82). Each mass contains from fouror five to nearly seventy eggs with an average of about twenty-five. The egg is about ^ inch in length, elongate oval andorange in color, with the surface smooth and shining. Theegg is glued to the leaf with a small mass of orange-coloredmaterial. The female is capable of laying from 200 to over1800 eggs with a probable average of 400 or 500. The eggsdo not ripen continuously but in successive batches; all theeggs which ripen at a given time may be deposited in one or L 146 MANUAL OF VEGETABLE-GARDEN INSECTS. iiKire clusters. The average length of the egg-laying periodin the field is probably between four and six weeks, but under cage conditionsthe beetles havecontinued to layeggs for ten weeksor more. Theeggs hatch in fourto nine days. Onh a t c h i n g, theyoung larva be-gins at once tofeed on the the first stageit is about yo ilchin length, darkred in color withthe head, thoracicshield and legs black and with a double row of black spotsalong each side of the body. In the course of its developmentthe larva passes through three orfour stages according to differentobservers. In the last stage it isabout f inch in length; the head,legs and posterior part of the cervi-cal shield are black; the body isred, lighter than in the first stageand there are two rows of distinctblack spots on each side; the ab-domen is strongly convex and ismuch larger than the head andthorax (Fig. 83). The larvse be-come full-grown in ten days to three weeks and then en
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
