Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . At the same time clusters of the cocoons of one of the commonparasites of the army-worm were found everywhere abundant on thesurface of the ground, and in some cases on the dried remains ofthe army-worm itself. Of seventy-six pupae of the worm, collectedin this field at this time, but one reached maturity. 103 The Cabbage Cut-Worm (Agrotis annexa, Fr.) The larva of this moth (kindly determined for me by Prof. C. ) was found destroying young cabbage plants at Normal inthe middle of April. It
Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . At the same time clusters of the cocoons of one of the commonparasites of the army-worm were found everywhere abundant on thesurface of the ground, and in some cases on the dried remains ofthe army-worm itself. Of seventy-six pupae of the worm, collectedin this field at this time, but one reached maturity. 103 The Cabbage Cut-Worm (Agrotis annexa, Fr.) The larva of this moth (kindly determined for me by Prof. C. ) was found destroying young cabbage plants at Normal inthe middle of April. It came out of the ground when the sun waswarm, cut off the plants at or near the surface, and then atethe leaves. In a garden containing 600 pLants not over twentyor thirty were left. The owner killed about 200 worms on thefirst day of their appearance, and 500 or 600 on the day follow-ing. The field was afterwards set to late cabbages, which were notmolested. The application of Paris green would have probably ex-terminated the worms, if made in time. The Stalk-Borer {Gortyna iiitela, Guenee).. Fig. 23.—Stalk borer {Gortyna nilela, Guenee). 1 Moth, 2 larva. This worm was found injurious to oats throughout Central andNorthern Illinois, in July and August. The ettect upon the grainwas to blast the head, preventing the kernel from filling. The entrance of the worm to the stalk was made anywhere fromabove the first joint to the fourth joint below. The worms found inthe oats were not more than half grown, and the size of the open-ings by which they entered the stalk made it evident that they werenot hatched upon this grain. In some cases they emerged by theorifice of entrance, and in others made a separate exit. The differ-ence in size between the openings of entrance and exit was usuallytrivial, showing that the worms grew but slightly in a single one larva to a straw was found, except in a single instance,where two had met face to face. One of these had attacked theothe
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbenefic, bookyear1876
