Methoden zur Kontrolle des Tabakkonsums Insekten. e vollständig in den fol-genden Diskussion der Tabak Horn - Worms. Der Tabak hornworms. (Phlegethontius sexta Joh. und Phlegethontiusqainquemaculata Haw.) Im Dunkeln Tabak Bezirke ofKentucky und Tennessee die Hupe - Würmer sind die Schädlichsten tobaccoinsects, und Sie sind wichtige enemiesof dieses Anbaus in jedem Bezirk in theUnited States, wo es gewachsen ist. Therearc zwei Arten, den Nördlichen tobaccoworm (Phlegethontivs quinquemaculataHaw.) und dem südlichen Tabak worm (Phlegethontws sexta Joh.) (Abb. 7). Thenorthern Tabak Wurm ist auch die Sp genannt

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Methods of controlling tobacco insects . e fully in the fol-lowing discussion of the tobacco horn-worms. THE TOBACCO HORNWORMS. (Phlegethontius sexta Joh. and Phlegethontiusqainquemaculata Haw.) In the dark tobacco districts ofKentucky and Tennessee the horn-worms are the most injurious tobaccoinsects, and they are important enemiesof this crop in every district in theUnited States where it is grown. Therearc two species, the northern tobaccoworm (Phlegethontivs quinquemaculataHaw.) and the southern tobacco worm(Phlegethontws sexta Joh.) (fig. 7). Thenorthern tobacco worm is called also the Spanish worm in Tennesseeand Kentucky. This worm, or larva, is in general darker than thesouthern tobacco worm, but the easiest way of distinguishing thetwo species is by the white markings on the sides of the body. Thenorthern worm has S V-shaped markings on each side of the body, each of which incloses a spiracle, or breathing pore. The southernworm has 7 oblique lines on each side of the body, each of whichpasses in front of a spiracle.. Fig. ((.—Knapsack spray pump. DISTRIBUTION. In general, as the common names indicate, the northern wormis most numerous in the north and the southern worm is mostnumerous in the south. The northern species is found as far south as Florida, though it is rare, and the southern species has been collectedin Canada. At Washington, I). C, on the authority of Dr. F. II. Chittenden, the northern species predominates, while in Tennessee METHODS OF CONTROLLING TOBACCO INSECTS. 7 the southern species is much the most abundant. These two speciesarc so nearly alike in their work, life history, and seasonal history thatthe remedial measures which apply to one will apply equally well tothe other. The life history and seasonal history notes given in thisarticle are from observations upon the southern species (Plilege-thontius sexta Joh.). LIFE HISTORY AND SEASONAL HISTORY. This circular does not propose to describe in detail the life historyand seasonal hist

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• bookcentury1900
• bookdecade1910
• bookpublisherwashi
• bookyear1910