Reports on Economic Zoology

Reports on Economic Zoology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...stems of equisetums, docks, valerian, but probably attack a variety of other plants. The larva when mature varies from an inch and a quarter to an inch and a half in length. The back and sides are dull purplishbrown, paler on the first three segments and where the segments join, the sides and venter are of a dull flesh colour, the legs pale and the head yellowish-brown; on the second segment is a brown semicircular plate broadly margined in front with blackish-brown and a shiny yellowish-brown patch on the anal segment with a posterior border of small dark warts; on the segments are small dark-brown tubercular warts each with a fine terminal hair; the spiracles are deep brown and the prolegs pale with black extremities. Before pupation the larva becomes a paler dull smoky flesh colour all over, with a dusky median dorsal line. The full-fed stage is reached from the beginning to the end of July. During the whole of its life the larva burrows up the haulm and emits a great quantity of green frass; a round exit hole is made in the stem, the frass being G emitted through this. Buckler quotes a letter from the Hon. T. de Grey as follows: --" I first observed the larva by pulling up, on the 14th May, a sickly-looking plant of Equisetum arvense. It appeared to be feeding on the root and stem below the surface of the ground, but when placed in a bottle with a supply of the food plant, it immediately entered a stem, and fed upon the inner substance, hollowing it completely out, and ejecting the frass at the lower end." This describes the way it has been observed working in potato haulm. They work with great rapidity, eight inches being tunnelled in an hour by one specimen under observation. The damage caused by a small number in a plot of...show more

Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236624025
  • 9781236624024