Half hours with insects . Chain moth and caterpillar. symmetry of the oak is maintained by the judicious pruningof boring beetles and other insects, while its boughs afibrdrest and shelter to the birds, which in their turn judiciousljcheck the too great increase of the insect plunderers, andinstal a reign of conservative agencies which maintain theoak in its pristine vigor and hands it down from generationto generation of landed proprietors. The growth and main-tenance of field crops are almost wholly regulated by the 4 Packard] INSECTS OF THE EIELD. 197 insects, now that the birds ar
Half hours with insects . Chain moth and caterpillar. symmetry of the oak is maintained by the judicious pruningof boring beetles and other insects, while its boughs afibrdrest and shelter to the birds, which in their turn judiciousljcheck the too great increase of the insect plunderers, andinstal a reign of conservative agencies which maintain theoak in its pristine vigor and hands it down from generationto generation of landed proprietors. The growth and main-tenance of field crops are almost wholly regulated by the 4 Packard] INSECTS OF THE EIELD. 197 insects, now that the birds are not allowed a fair chance ofrestraining the undue increase of these pests. Our potatocrops are becoming dependent on the number of insectsrather than the excellence of artificial fertilizers ; we maytop-dress our wheat fields, and till the soil never so sedu-lousl}^ but the fact is well known that the wheat crop in theeastern states is nearly cut off by the Hessian fly, the wheatmidge, and the joint worm. Our corn fields in the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
