. Agricultural zoology. Zoology. 114 ZOOLOGY. leaves. In favourable weather there may be even a third generation. In many it happens that the beetles of the second generation migrate to beet or mangold plants, sometimes damaging them to a very great extent. Remedy: Rooting out species of goose-foot or orach. The Earth Fleas, or Flea Beetles, are all small leaf beetles with the power of springing, and therefore provided with thick thighs. Here belong:— The Rape Flea Beetle {Psylliodes chrysocephalus)— Fig. 84. Egg-shaped. Hind feet not inserted at the ends of the shanks, but higher up. The firs
. Agricultural zoology. Zoology. 114 ZOOLOGY. leaves. In favourable weather there may be even a third generation. In many it happens that the beetles of the second generation migrate to beet or mangold plants, sometimes damaging them to a very great extent. Remedy: Rooting out species of goose-foot or orach. The Earth Fleas, or Flea Beetles, are all small leaf beetles with the power of springing, and therefore provided with thick thighs. Here belong:— The Rape Flea Beetle {Psylliodes chrysocephalus)— Fig. 84. Egg-shaped. Hind feet not inserted at the ends of the shanks, but higher up. The first joint of the foot is as long as the others put together. The rest of the hind foot is bent in a knee-like way on the first long joint. Shining blackish brown or blackish green, rarely brownish. Larva one-fifth to one-fourth of an inch, dusky white; head, neck-shield, and last segment of the body blackish brown. In spring and during the entire summer the beetles are found upon the plants of winter rape. Although they gnaw the leaves and the immature shoot the damage caused is small. In late summer or autumn the female beetles lay their eggs separately at the bases of the leaf-stalks of the young winter rape plants. The larvte which emerge bore into the leaf-stalk, and eat it completely out during autumn, winter, and spring, so that the leaf dies. Since the eggs are laid separately the larvse do not all develop at the same time in the spring. In spring many larvse eat their way from the leaf- stalks into the still very short stem, which con- sequently ceases to develop. It often happens that. Fig. 84.—The Eape Flea Beetle (2) with hind-leg of the same; larva (1) and its Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
