Report of the State Entomologist of Indiana and List of Indiana Nurserymen

Report of the State Entomologist of Indiana and List of Indiana Nurserymen

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...the plants to outgrow the work of the insects, thus contributing somewhat to the control of the pest. Plants infested with this insect should never be used, and it would be well to change the location of the beds from year to year. Such a rotation of crops is advisable from the standpoint of farm practice. TWO S'AWBE'Y PLANT The one at the right is healthy and the one at the left is dwarfed by root aphi The scale insects as a class constitute one of the tinost important groups of economic insects. They are important from the fact.t0natO they are of small size and inconspicuous character, and from_ the_ fact that they increase at an alarming rate. It has been estimated that a single female San Jose scale would at the end of the season have produced 1,600,000,000 active females. As a matter of fact, such an increase never takes place, owing to the intervention of natural enemies which kill many of the individuals while they are still very young. The figures show, however, that the pest breeds rapidly, and account in some measure for the alarming rate at which this scale destroys orchards when the trees once become infested. In the case of insects of this class the visible portion is simply a plate or "scale" which covers the body of the insect proper. This scale makes it hard to reach the insect with any sort of insecticide, and we must accordingly use some preparation that will either penetrate through the scale or so loosen it that it will fall away from the body of the insect. Practically the only remedy that we have for these insects today is the lime and sulphur solution which is mentioned with other insecticides in another part of this report. Many of the prepared insecticides which are on the market are serviceable...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236979109
  • 9781236979100