Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . to destroy them beforethey can escape. The White-marked Tussock Caterpillar {Orgyia leucostigma, Smith). This beautiful caterpillar iseasily recognized by the fourlarge brush-like tufts of finehairs on the front part ofthe back, and the two longblack pencils of hairs ex-tending backwards and for-wards from each end of the Flg:^-The White-marked Tussock caterpillar bo^jY;, It Was reported tO me{Orgyia leucostigma, Smith). last tail aS OCCUlTlllg 111 Un- usual numbers throughout the northern part of
Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . to destroy them beforethey can escape. The White-marked Tussock Caterpillar {Orgyia leucostigma, Smith). This beautiful caterpillar iseasily recognized by the fourlarge brush-like tufts of finehairs on the front part ofthe back, and the two longblack pencils of hairs ex-tending backwards and for-wards from each end of the Flg:^-The White-marked Tussock caterpillar bo^jY;, It Was reported tO me{Orgyia leucostigma, Smith). last tail aS OCCUlTlllg 111 Un- usual numbers throughout the northern part of the State, and theegg-clusters upon the leaves of apple trees attracted the general at-tention of orchardists in the fall. It has not been especially abundantor destructive before since 1870, at which time it was treated in thereport of Dr. LeBaron, then State Entomologist. It was also furtherdiscussed by Dr. Thomas in the seventh report, for the year 1877;but as there is a present prospect of an unusual development ofthis insect, it will be profitable to call attention to it at the present. ICl time. The usual method of prevention recommended is that of re-moving the egg chisters in the falL The eggs are laid by the femaleupon the outer surface of the cocoon from which she has justemerged, forming very conspicuous objects upon the leafless they do not iiatch until May or June, they may be removed atany time in the winter or early spring. Doubtless, if this has beenneglected, the spraying of the foliage during the months of June orSeptember with Paris green or London purple, suspended in water,would also be a perfect remedy. The Bag-worm (Thyreodopteryx ejjhemerceformis, Haw).
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbenefic, bookyear1876
