. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1784 TERATOLOGY TERATOLOGY known examples. The gall-gnats among the true flies (Diptera) also produce a large variety of malforma- tions, of which the cone-like galls resulting from de- formed buds of the willow and the goldenrod are best known. Plant lice (Aphidse) are responsible for the large smooth red gall
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1784 TERATOLOGY TERATOLOGY known examples. The gall-gnats among the true flies (Diptera) also produce a large variety of malforma- tions, of which the cone-like galls resulting from de- formed buds of the willow and the goldenrod are best known. Plant lice (Aphidse) are responsible for the large smooth red galls on the petiole of stimachs, and for the flatfish serrated galls on elm leaves. The fusi-. 2484. Dahlia leaf, illustrating the branching of leaves. form galls on stem of goldenrod and asters is caused by the larva of a moth. In addition to true insects, the mites produce almost as great a variety of galls, pouch- galls and leaf-rolling being especially conspicuous. The cause of these deformities is sometimes the chemical stimulus produced by the of substances ("poisons ") at the time of egg-laying by the parent, in which case the gall develops around the egg; sometimes it is the mechanical stimulus due to movements of the. 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 Bailey, L. H. (Liberty Hyde), 1858-1954 ed; Miller, Wilhelm, b. 1869, joint author. New York [etc. ] The Macmillan company
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