Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 a, female hop-louse, showing eggs through skin ; b, the stem-mother that starts the transformation ; much enlarged. winter in the &^g stage ; but this is subject to many exceptions, especially in the warmer parts of the country. Early in spring, as soon as there is a trace of reviving vegetation, these eggs hatch. The insect that now appears is wingless, and usually remains so, but grows rapid
Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 a, female hop-louse, showing eggs through skin ; b, the stem-mother that starts the transformation ; much enlarged. winter in the &^g stage ; but this is subject to many exceptions, especially in the warmer parts of the country. Early in spring, as soon as there is a trace of reviving vegetation, these eggs hatch. The insect that now appears is wingless, and usually remains so, but grows rapidly by sucking the plant juices, and soon begins to produce living young. It is called a 'stem- mother,' because it is the source from which numerous genera- tions issue during the season. All the young born by this stem- mother are, like herself, without sex ; that is, they are neither males nor sexually-developed females. The rate at which they are born varies, but as many as eight living young have been
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