Methods of controlling tobacco insects . thai one Fio. 8. Hibernation ol Southern tobacco horn worm: c, Pupa In hibernatingcell in soil, hi the depth at which pupation usuallj takes place in the stiflertlon oi pupal cell viewed from below; b, pupal cell showingentrance hole of larva or worm. Two-thirds natural size. (Original.) is, about H) to 12 days after the eggs are deposited ihBe injure tobacco seriously. In the fourth (fig. 9) and fifthlarva \\ ill ruin a small leaf of tobacco in a single da\ . at thestages METHODS OF CONTROLLING TOBACCO INSECTS. Table I.—Average length of differen
Methods of controlling tobacco insects . thai one Fio. 8. Hibernation ol Southern tobacco horn worm: c, Pupa In hibernatingcell in soil, hi the depth at which pupation usuallj takes place in the stiflertlon oi pupal cell viewed from below; b, pupal cell showingentrance hole of larva or worm. Two-thirds natural size. (Original.) is, about H) to 12 days after the eggs are deposited ihBe injure tobacco seriously. In the fourth (fig. 9) and fifthlarva \\ ill ruin a small leaf of tobacco in a single da\ . at thestages METHODS OF CONTROLLING TOBACCO INSECTS. Table I.—Average length of different stages in life history of the southern tobaccohornworm (Phlegethontius sexto). Emer-gence of Incu-moth bationto ovi- period,posi-tion. Instars, or stages, in growth of larva. Total lifecycle. First. Second. Third. Fourth. Fifth. £3 pp° period. Perl°d- Days. 4 Days. 4- Days. 48
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
