. Nature study and agriculture. Nature study; Agriculture. OTHER INSECTS OF SPECIAL INTEREST 227 willow twigs, or on the oak (oak apples) are familiar examples They are caused by small four-winged insects called gall- flies. These lay their eggs in the tissues of the leaf or stem and when the larva is hatched out and begins to eat, the remarkable growth of the gall also commences. In many species of gallfly the larva changes to pupa and then to adult within the galls, while in other species the full-grown larva leaves the gall and makes these changes afterward. Plant lice and mites also produc
. Nature study and agriculture. Nature study; Agriculture. OTHER INSECTS OF SPECIAL INTEREST 227 willow twigs, or on the oak (oak apples) are familiar examples They are caused by small four-winged insects called gall- flies. These lay their eggs in the tissues of the leaf or stem and when the larva is hatched out and begins to eat, the remarkable growth of the gall also commences. In many species of gallfly the larva changes to pupa and then to adult within the galls, while in other species the full-grown larva leaves the gall and makes these changes afterward. Plant lice and mites also produce many galls, these being much smaller than the kind made by flies. These smaller galls always have an opening through which the residents may pass in and out, while those formed by gall- flies are closed until the inmates bore ,, „ Cjoldenrod with Gall- the tunnel to make their escape. nut. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schmidt, Charles Christian, 1859-. Boston, New York [etc. ] D. C. Heath & Co
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