A Method of Distinguishing between Young and Old Colorado Beetles

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PREVIOUS records do not appear to give any indication of how to distinguish between young and old Colorado beetles, except during the first few days following the emergence of the young beetle. I have found evidence that it is possible to separate young and old beetles for a period of at least fourteen days after the emergence of the young adult by means of colour changes in the membranous wings. This fact is of considerable practical importance and assistance to entomologists, especially in countries where the beetle has not yet become an endemic pest.

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DUNN, E. A Method of Distinguishing between Young and Old Colorado Beetles. Nature 162, 75 (1948) doi:10.1038/162075c0

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