Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . ially liable to injure corn plant-ed on sod land, but such damage may easily be pre-vented by using the poison traps described in con-nection with remedies for cabbage cutworms ().The field to be planted should be strewn with poi-soned clover or grass, or cabbage leaves, before thecrop is put in, although if not done then the baitsmay be placed between the rows afterwards. The Garden Web-worm. Eurycreon insect occasionally becomes destructive overa wide area,
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . ially liable to injure corn plant-ed on sod land, but such damage may easily be pre-vented by using the poison traps described in con-nection with remedies for cabbage cutworms ().The field to be planted should be strewn with poi-soned clover or grass, or cabbage leaves, before thecrop is put in, although if not done then the baitsmay be placed between the rows afterwards. The Garden Web-worm. Eurycreon insect occasionally becomes destructive overa wide area, and damages a great variety of crops,although corn usually suffers most. The adult is asmall, grayish moth (Fig. 114, /), expanding aboutthree-quarters of an inch,the females of which de-posit their eggs upon theleaves or stems of variousplants. Soon after hatch-ing the young larvae be-gin to spin a protectiveweb, which is enlarged asFig. ii4. Garden web-worn ,i i i t -n d, pupa, both twice natural size; /, the insects develop. lie- moth, slightly enlarged. neath this they feed upon the foliage, eating at first. 216 INSECTS AFFECTING THE INDIAN CORN. only the surface substance, but as they grow olderthey devour the whole leaf. The larvae become fullgrown in about a fortnight, when they spin thin,brownish cocoons on the ground, and change to pupse,to emerge ten days or two weeks later as are two or three broods each season. Remedies.—Spraying or dusting infested plantswith London purple or Paris green is the most prac-tical remedy for this insect that has yet been suggested. The Corn Aphis. Aphis maidis. The leaves and stalks of corn are often infested bycolonies of a small bluish aphis or plant-louse, themajority of which are wingless, and the rest is the Corn Aphis. It has been for a longwhile considered the aerial form of the Corn Root-louse, but the latest investigations indicate that thetwo are distinct species. The full life-history of this insect
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Keywords: ., bookcentury1800, bookdecade1890, bookidi, booksubjectinsecticides
