. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. i68 ECONOMIC ENTOMOLOGY Pediculid^ (Consult Bull. 5, Div. Ent., U. S. Dept. Agr.; Bull. 48, Minn. Agr. Exp. St.) Most domestic animals at some time or other are liable to become infested with sucking lice which cause considerable irritation. The eggs or "nits" are attached to the hairs, and the lice by means of a beak suck the blood of their victims. Treatment consists in the application of tobacco water or Black Leaf 40 (i part to 1000 water), dilute carbolic acid, kerosene
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. i68 ECONOMIC ENTOMOLOGY Pediculid^ (Consult Bull. 5, Div. Ent., U. S. Dept. Agr.; Bull. 48, Minn. Agr. Exp. St.) Most domestic animals at some time or other are liable to become infested with sucking lice which cause considerable irritation. The eggs or "nits" are attached to the hairs, and the lice by means of a beak suck the blood of their victims. Treatment consists in the application of tobacco water or Black Leaf 40 (i part to 1000 water), dilute carbolic acid, kerosene emulsion, sulphur and mercuric ointment, or an infusion of 4 oz. stavesacre and i oz. hellebore, or creolin solution. Two genera are of importance economically— Pediculus occurring on man, and Hcematopinus on domestic animals. Head-louse of Man {Pediculus capitis De Geer). —Whitish with faint dark markings on sides. Eggs (50) glued to hairs, whitish, hatch in 6 days and young become mature in about 3 weeks (Fig. 108). Body-louse of Man {Pediculus vestimenti LeBich). —Similar in shape to preceding, but larger and at maturity with upper surface transversely banded with black. Eggs laid in the folds in clothing. Bacot {Parasitology, 1917) states that P. capitis and P. vestimenti may cross-pair with fertile offspring. He found that the average number of eggs per day was for capitis and for vestimenti. The egg period for the latter was estimated at 12 days, and 12 days more for the maturity of the female. "Allowing an average of 8 eggs per day, spread over a fertile period of 40 days we find that during her life a single female may. have 4160 ; A carrier of typhus fever. A common pest of army camps. Control Measures.—Change clothing as often as possible; wash infested clothing with a cresol soap made as follows: water 10 gal., Jeyes' Fluid ij^ oz., soft soap i}^ lb.; bathe body using cresol soap; place , powder in shirt and trousers (naphthal
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
