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File:Phylloxera calendar.jpg

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Phylloxera_calendar.jpg (585 × 551 pixels, file size: 109 KB, MIME type: image/jpeg)

Summary

Description

Growth calendar of Phylloxera -

  • Inner crescent - active period of radicicole larvae
  • middle crescent - development of sexuparous migrant
  • outer circle
    • shaded - hibernation period of radicicole larvae
    • unshaded - active period of life on roots
Date
Source The grape phylloxera in California
Author USDA
Permission
(Reusing this file)
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Phylloxera_calendar.jpg

File history

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Date/TimeThumbnailDimensionsUserComment
current06:47, 2 January 2020Thumbnail for version as of 06:47, 2 January 2020585 × 551 (109 KB)Shyamal{{Information |Description=Growth calendar of Phylloxera - * Inner crescent - active period of radicicole larvae * middle crescent - development of sexuparous migrant * outer circle - shaded - hibernation period of radicicole larvae - unshaded - active period of life on roots |Source=[https://archive.org/details/grapephylloxerai903davi/page/125 The grape phylloxera in California] |Date=1921 |Author=USDA |Permission={{pd-1923}} |other_versions= }}
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