. Manual of vegetable-garden insects. only marsh cress in addition to horse-radish. The winter is passed by thebeetles in dry sheltered places. Theadult (Fig. 207) is about i inch inlength, oval, strongly convex, black incolor, with each wing-cover yellowish,except a narrow black stripe alongthe outer margin and a wider one onthe inner margin, the latter broadestat the middle. The antenna areyellowish at the base. The legs are yellowish except thehind femora and all but the tip of the front and middletibise, which are black. The beetles appear on the plantsearly in the spring and eat out holes
. Manual of vegetable-garden insects. only marsh cress in addition to horse-radish. The winter is passed by thebeetles in dry sheltered places. Theadult (Fig. 207) is about i inch inlength, oval, strongly convex, black incolor, with each wing-cover yellowish,except a narrow black stripe alongthe outer margin and a wider one onthe inner margin, the latter broadestat the middle. The antenna areyellowish at the base. The legs are yellowish except thehind femora and all but the tip of the front and middletibise, which are black. The beetles appear on the plantsearly in the spring and eat out holes in the leaves andcavities in the midribs. The female deposits her smooth,oval, orange eggs, about to inch in length, in clusters of twentyor more, loosely attached to the petioles of the young begins in late April or May and may continue untilAugust. Each female usually lays several batches of eggs andthe total number laid by a single individual may exceed eggs hatch in a week or two. On hatching, the young. Fig. 207. — The horse-radish flea-beetle (X 9). FLEA-BEETLES 329 larva enters the petiole, where it burrows through the tissue,often causing the death of the leaf. Its presence is indicatedby brownish, dead areas where the larva has come near thesurface. The mature larva is nearly i inch in length, slender,pale yellowish white, with the head, thoracic shield and analplate dark brown. From seven to over nine weeks are requiredfor the larva to reach maturity. It then descends to the ground,where it transforms to a small white pupa in an earthen celland in ten days to two weeks the beetles emerge. There isonly one brood annually. The beetles are more destructi\eearly in the season and the larvae later. The foliage is injuredto such an extent that the roots do not develop and the croj) isconsequently shortened. Control. The plants may be made distasteful to the beetles and someof them poisoned by thorough spraying with bordeaux mixturecontaining 4 o
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
