. Insect pests of farm, garden and orchard . aves and injurethem badly. Similar injury is doneto potato, egg-plant, and tomato,and the beetles also feed on horse-nettle, nightshade^ and Jamestownweed. Life History.—The eggs are laidin the soil and the larva? feed uponthe roots of common weeds, suchas the nightshade and Jamestownweed. The larva is delicate, thread-like and white, except the yellow-ish head, and about one-eighthinch long. It pupates in the the beetles become very nu-merous the larvae sometimes de-velop on the roots of tobacco, butrarely do serious damage. Thelife histo
. Insect pests of farm, garden and orchard . aves and injurethem badly. Similar injury is doneto potato, egg-plant, and tomato,and the beetles also feed on horse-nettle, nightshade^ and Jamestownweed. Life History.—The eggs are laidin the soil and the larva? feed uponthe roots of common weeds, suchas the nightshade and Jamestownweed. The larva is delicate, thread-like and white, except the yellow-ish head, and about one-eighthinch long. It pupates in the the beetles become very nu-merous the larvae sometimes de-velop on the roots of tobacco, butrarely do serious damage. Thelife history has not been deter-mined exactly, but the full lifecycle seems to occupy about amonth, so that there are probablyseveral generations in a year. Control.^Ina,sm\ich. as the larvaedevelop on the roots of the weedsmentioned, it is evident that theyshould be kept down by thoroughcultivation. Where the beetles ap-pear, the plants should ])e sprayedor dusted with Paris green, orprobably better, arsenate of lead,the same as for the Fig. 159.—T o b a c c o leavesdamaged l)y Epitrix par-vula. (After Howard, Dept. Agr.) Dipping the plants in arse- 224 INSECT PESTS OF FARM, GARDEN AND ORCHARD nate of lead, 1 pound to 10 gallons of water, just as they areset, has been found to afford very satisfactory protection inConnecticut. The Tobacco Stalk-worm * Professor W. G. Johnson found this species, also knowai asthe Corn-root Webworm, to be a serious pest to growing tobacco-plants in southern Maryland, where it seems to have been atobacco pest for at least fifteen years, and it has also been notedin Delaware. The Injury.—The injury to tobacco is described b} ProfessorJohnson as follows: ^The uninjured tobacco had a leaf-spreadof from ten to twelve inches. A few rods ])eyond, where the soilwas not so gravelly and better, we found the larva? had literallydestroyed the first and second plantings, and were at work uponthe third, damaging it severely, although the ground h
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