. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. 154 ECONOMIC ENTOMOLOGY Family Cicadellid^ (Leaf-hoppers) (Consult Bull. io8, Bur. Ent., Dept. Agr. and Bull. 238, 248, Maine Agr. Exp. Stn.) The Leaf-hoppers are divided into four fairly distinct sub-families, separated by means of the venation of the wings and by the head parts: (i) Bythoscopince occurring mainly on trees or shrubs, and including Idiocertis alternatus and the Clover Leaf-hopper (Fig. 99); (2) Cica- dellincB, including the Sharpshooter (Oncometopia undata) and Dr
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. 154 ECONOMIC ENTOMOLOGY Family Cicadellid^ (Leaf-hoppers) (Consult Bull. io8, Bur. Ent., Dept. Agr. and Bull. 238, 248, Maine Agr. Exp. Stn.) The Leaf-hoppers are divided into four fairly distinct sub-families, separated by means of the venation of the wings and by the head parts: (i) Bythoscopince occurring mainly on trees or shrubs, and including Idiocertis alternatus and the Clover Leaf-hopper (Fig. 99); (2) Cica- dellincB, including the Sharpshooter (Oncometopia undata) and Drcecula- cephala mollipes occurring in grass land; (3) Jassince, including the Shovel-nosed Leaf-hopper (Dorycephalus platyrhynchus) on wild rye. Fig. 99.—The clover leaf-hopper (Agallia sanguinolenla): a, adtilt; h, nymph, side view; c, nymph, dorsal view; d, face; e, elytron; /, female genitalia; g, male genitalia. All enlarged. {After Osborn and Ball.) {Elymus), the Inimical Leaf-hopper {DeUocephalus inimicus) on blue grass, the Destructive Leaf-hopper {Athysanus exitiosus) in grain fields, and the Six-spotted Leaf-hopper {Cicadula 6-notata) in oat fields; and (4) TyphlocybincB including the Apple Leaf-hopper {Empoasca mali) the Rose Leaf-hopper {Empoa rosce) and the Grape Leaf-hopper {Erythroneura comes). The presence of leaf-hoppers in very large numbers in meadows and pastures in late summer indicates that considerable injury is being done, and that they must be reckoned among insects of economic importance. Six-spotted Leaf-hopper {Cicadula 6-notata Fallen).—A small yellow form 4 mm. long with six black dots on the vertex and a double series of black arcs on the front. Occurs on oats, timothy, etc., producing spots on the leaves, whitish at first, then turning to brown or 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
Size: 2346px × 1065px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
