. Manual of vegetable-garden insects. e been foundespecially abundant on the roots of thewild mustard. The larva? eat off thesmaller roots and riddle the main onewith tunnels, sometimes excavating theentire root. The full-grown larva isal)out i inch in length, whitish with alight brown head. In Illinois the larvteare present in late Mav and June and Fig 204. - The striped ^ 1 c 1 1 • 4 cabljago flea-beetle give rise to a brood or beetles in August. (x 13). The over-wintered beetles mostly <lis- appear in June and in the North turnips sowed after this date are likely to escape injury. In Nor
. Manual of vegetable-garden insects. e been foundespecially abundant on the roots of thewild mustard. The larva? eat off thesmaller roots and riddle the main onewith tunnels, sometimes excavating theentire root. The full-grown larva isal)out i inch in length, whitish with alight brown head. In Illinois the larvteare present in late Mav and June and Fig 204. - The striped ^ 1 c 1 1 • 4 cabljago flea-beetle give rise to a brood or beetles in August. (x 13). The over-wintered beetles mostly <lis- appear in June and in the North turnips sowed after this date are likely to escape injury. In North Carolina a second brood of larvffi has been observed on turnips in October. In Illinois there is said to be but one generation annually but in North Carolina there are at least two. Cabbage plants in the seed-bed are very liable to injuryby this flea-beetle. They may be protected by screening thebeds with cheesecloth as recommended for the cabbage root-maggot (page 35). ReferenceShimer, Ameriean Naturalist, 2, pp. 514-517. 326 MANUAL OF VEGETABLE-GARDEN INSECTS In California a closely related species, PhyUotreta ramosaCrotch, in which the yellowish stripe on the wing-cover has ashort branch just back of the middle, has been reported as in-jurious to turnip, radish and mustard. The four-spotted cabbage flea-beetle, PhyUotreta bipustulataFabricius, is sometimes found feeding on cabbage and turnipin the Atlantic states. Its wild food plants are hedge mustard,charlock and shepherds purse. It has never been known tocause any serious injury. In this species each wing-cover ismarked with two large yellowish spots. In California cabbage, radish, mustard and turnip are some-times attacked by a small, dark, metallic green flea-beetle,Ilemiglyptus basalis Crotch. The Sinuate-Striped Flea-Beetle PhyUotreta sinuaia Stephens This flea-beetle is often found in company with the stripedcabbage flea-beetle, feeding on cabbage, turnip and insect was probably introduced from
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