Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 7ffE INSECT WORLD. 123 It is a short step from the Aleyrodidce to the plant-hce, be- longing to the family AphididcE. Plant-lice are well known to agriculturists by the injury they cause, and tliey are interesting to the naturalist from their life history. Here we have the most striking apparent exception to the general rule that insects are developed from eggs, and yet perhaps the exception is more app
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . economicentomolo00smit Year: 1906 7ffE INSECT WORLD. 123 It is a short step from the Aleyrodidce to the plant-hce, be- longing to the family AphididcE. Plant-lice are well known to agriculturists by the injury they cause, and tliey are interesting to the naturalist from their life history. Here we have the most striking apparent exception to the general rule that insects are developed from eggs, and yet perhaps the exception is more apparent than real. At all events, parthenogenesis, or repro- duction without the intervention of a male, occurs normally in a large percentage of the species. Of course there are many differ- ences in life habits, but a general account, covering most of the cases, is all that can be attempted here. As a rule, plant-lice Fig. 92.
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