. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 121 Adult.—One-fifteenth inch long; head and thorax dark brown, abdomen yellowish brown; antennae with 8 segments; 3 to 4 weeks for a generation; fore-wings with two, hind-wings with one longitudinal vein. Eggs.—Hatch in 5 to 8 days; laid singly in leaf tissue; colorless and bean-shaped. Nymphs.—Mature in 20 to 25 days. Onion Thrips or ''White Blast'' (Thrips tabaci Lind.).—Attacks a large variety of garden plants. Found on bulbs of onio
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 121 Adult.—One-fifteenth inch long; head and thorax dark brown, abdomen yellowish brown; antennae with 8 segments; 3 to 4 weeks for a generation; fore-wings with two, hind-wings with one longitudinal vein. Eggs.—Hatch in 5 to 8 days; laid singly in leaf tissue; colorless and bean-shaped. Nymphs.—Mature in 20 to 25 days. Onion Thrips or ''White Blast'' (Thrips tabaci Lind.).—Attacks a large variety of garden plants. Found on bulbs of onion in loose soil and at axils of leaves. Punctures the tissues and sucks the sap, giving the field a whitish appearance. Produces also scuHions or thick Fig. 76.—Wheat thrips {Euthrips Iritici). Greatly enlarged. {After Folsom.) Adult.—One-twenty-fifth inch long, active, slender, yellowish tinged with black, two pairs of bristly narrow wings which fold along the back. Probably winters over in the rubbish on the ground; life-cycle about 3 weeks, hence several generations in a season. Eggs.—^Laid singly in spring or early summer within the leaf tissue, Jf 00 i^ch long, elongate and curved; hatch in about 4 days. Nymphs.—Transparent at first, later greenish-yellow; mature in II or 12 days. Control.—Spray with solution of nicotine sulphate and whale oil soap (4 oz., 4 lb., 40 gal.). 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 Lochhead, William, 1864- [from old catalog]. Philadelphia, P. Blakiston's son & co
Size: 1699px × 1471px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
