. Agricultural entomology for students, farmers, fruit-growers and gardeners. Insects; Insects, Injurious and beneficial. FAMILY APHIDIDM 117 during the rapid growing period of the leaf these galls are developed and the larvae are growing within them. There is a single generation during the year. This is the plan of development for practically all of these psyllid galls. A number of different kinds occur on hackberry trees. They are readily identified by the character of the galls produced on the trees. Most species are located on the leaves, but some species form a structure on the twig by a
. Agricultural entomology for students, farmers, fruit-growers and gardeners. Insects; Insects, Injurious and beneficial. FAMILY APHIDIDM 117 during the rapid growing period of the leaf these galls are developed and the larvae are growing within them. There is a single generation during the year. This is the plan of development for practically all of these psyllid galls. A number of different kinds occur on hackberry trees. They are readily identified by the character of the galls produced on the trees. Most species are located on the leaves, but some species form a structure on the twig by a modification. Fig. -Pear-tree psylla: nymph greatly enlarged. Ent., U. S. Dept. Ag.) (From Marlatt, Div. of the bud. There is a distinct specialization in the matter of food supply which characterizes a large part of the family Psyllidse. Stimulation of the plant tissues is produced by the action of the larvae in puncturing the cells. Family Aphididse.—This family is specialized particu- larly with reference to the mode of reproduction. It agrees with other forms of the Sternorhynchi in having the beak apparently fused with the prosternum, so that the beak appears to arise from the sternum. There is a reduction of. 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 Osborn, Herbert, 1856-1954. Philadelphia, New York, Lea & Febiger
Size: 1527px × 1635px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1916
