Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ined beetle, or Coloradopotato-beetle, Doryphoia lo-lineata. No description of thisinsect is necessary, the figures serving to illustrate all its stagessufficiently well. The insects winter underground as adults orpupae, and the beetles emerge early in spring, attacking theyoung plants as soon as they show above ground, and layingeggs for the livid-reddish larvee. About midsummer these havematured a second brood of beetles, and a second brood of larvae 214 AN ECONOMIC ENTOMOL
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ined beetle, or Coloradopotato-beetle, Doryphoia lo-lineata. No description of thisinsect is necessary, the figures serving to illustrate all its stagessufficiently well. The insects winter underground as adults orpupae, and the beetles emerge early in spring, attacking theyoung plants as soon as they show above ground, and layingeggs for the livid-reddish larvee. About midsummer these havematured a second brood of beetles, and a second brood of larvae 214 AN ECONOMIC ENTOMOLOGY. follows shortly thereafter, resulting in a fall supply of beetles,which, as a rule, hibernate. Sometimes a third partial brood oflarvae reaches the pupal state, and hibernates in that arsenites are well-known and approved remedies, used at therate of one pound in from seventy-five to one hundred gallonsof water, and several machines especially intended for sprayingpotato-fields are on the market. The insect maintains itselfunchecked, because, while active war is waged against the first Fig. The Colorado potato-beetle, Doryphora 10-lineata.—a, a, egg patches ; b, b, b, larvae indifferent stages of growth ; c, pupa; rf, beetle; e, its elytra enlarged. brood, little attention is paid to the second, and this is usuallyallowed to mature and provide for a new crop the year should be done first as soon as the beetles begin feed-ing, to prevent oviposition if possible ; it should be done a sec-ond time when larvze appear generally, and it should be done asoften thereafter as beetles or larvae are noticed infesting theplants. The species of Diabrotica are rather slender, with long an-tennae ; of a green or yellow color, with black spots or adults feed on leaves, flowers, or ]:)ollen, but the larvae, whichare white and slender, usually feed in the roots or stems of of our most common forms, D. vittata, is known as thest
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
