. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE FALL WEB-WORM. 49 -"This parasite (Fig. bas performed very gooil services moth, and the hirvie produced soou consume the contents. This egg- parasite is a very useful friend, nipping the evil in the bud, so to speak. Meteorus hyphantria\ Ri- ley. 24) during the (jaterpillar plague, and has done much to check any furtherincrease of the Web- worm. During the earlier part of the summer this in- sect was not very nume- rous, but sufficient proofs in the form of empty co- coons were observed to in- dicate at
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE FALL WEB-WORM. 49 -"This parasite (Fig. bas performed very gooil services moth, and the hirvie produced soou consume the contents. This egg- parasite is a very useful friend, nipping the evil in the bud, so to speak. Meteorus hyphantria\ Ri- ley. 24) during the (jaterpillar plague, and has done much to check any furtherincrease of the Web- worm. During the earlier part of the summer this in- sect was not very nume- rous, but sufficient proofs in the form of empty co- coons were observed to in- dicate at least one earlier brood. Towards the end of September, and as late as the 15th of October, very. Fig. 24.—Meteorus hgphantrioe: a, larged). female; 6, cocoon (en- numerous cocoons of a second brood were formed ; they could be found in all situations to which the caterpillar itself had access. But the g^reat majority of them were suspended from the trunks and branches of trees, and chiefly from near the base of the trunk. Each cocoon rep- resents the death of one nearly full-grown caterpillar, since the latter harbors but one larva of the parasite.* A careful watch was kept to see how such a suspended cocoon was formed, but in vain. Once a larva had just started to make a cocoon, but it was prevented from finishing it by a secondary parasite, and it died. Another larva had already spun the rough outside cocoon, but became detached and dropped out of the lower orifice, and commenced a new one. The larva, suspended by the mandibles, evidently spins at first loose, irregular, horizontal loops -around its body, until a loose cradle is formed. The silk secreted for this purpose hardens very rapidly when exposed to the air. When secure inside this cradle it lets go its hold with the mandibles, and finishes the soft inside cocoon in the usual manner. If the larva has dropped to the Ijround it still makes an outer loose cocoon, but the silken threads are thicker and much more irregula
Size: 1619px × 1543px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectentomology, booksubjectinsects, booky
