. Insect enemies and diseases of the tomato. 6.—The common stalk-borer: a, typical form of moth (male) ; b, nitela form(female) ; c, young larva; d, mature larva in injured stalk; e, pupa. All some-what enlarged. Control.—The stalk-borer usually breeds in the stems of ragweedand burdock and when these are cut or hoed out during tlie grow-ing season it deserts them, often coming upon tomato and othercrops planted for human use. This points out the most effectivemethod of control—prevention by clean culture. The weeds men-tioned should not be allowed to grow in or near the tomato gardenand shoul
. Insect enemies and diseases of the tomato. 6.—The common stalk-borer: a, typical form of moth (male) ; b, nitela form(female) ; c, young larva; d, mature larva in injured stalk; e, pupa. All some-what enlarged. Control.—The stalk-borer usually breeds in the stems of ragweedand burdock and when these are cut or hoed out during tlie grow-ing season it deserts them, often coming upon tomato and othercrops planted for human use. This points out the most effectivemethod of control—prevention by clean culture. The weeds men-tioned should not be allowed to grow in or near the tomato gardenand should be kept down during the season. When borers arefound they should be killed, as they may injure a number of plantsbefore reaching full growth. Spraying with arsenicals for otherinsects which may be present may also protect plants somewhatagainst this pest, but it is not a specific remedy. Two forms of plant-lice or aphides (fig. 7), known respectively asthe potato aphis and the spinach aphis have in recent years become. s extremely destructive totomatoes in the north-western part of theUnited States. The po-tato aphis, often called-\J\^ the tomato aphis, is one of our largest forms ofplant-lice. It is of vari-able color, usually of aA^y^ V pinkish tinge, although some individuals areJ green. It measures about Yg of an inch andhas honey tubes which^ extend beyond the tip Pig. 7.—An aphid: a, winged adult aphis; b, of the body, long ICgSyoung nymph; c, older nymph; d, last stage -i faa^f^-ra Tha aninaoh of nymph, or pupa. Greatly enlarged. ^^ leeieis. lue hpiudtii aphis, while very trou-blesome on potatoes and tomatoes, attacks many other crops, issmaller, and has a much wider distribution, being found practicallyeverywhere in the United States. Aphides subsist by sucking the vital juices of the plants, and areusually found on the underside of the leaves, where they gather inlarge colonies, and frequently on the buds and tips of the younggrowing plants. Some
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