. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). 20 NEW YORK STATE MUSEUM nized by its cylindric dark brown abdomen with yellow mark- ings as represented in fig. 1. The female deposits her eggs in the trunks of sickly* trees, where the larvae run large cylindric burrows. Many elms in both Albany and Troy show numerous holes caused in this way. This borer has a deadly parasite in the lunate long sting, Thalessa lunator Fajbr. This beneficial insect is of great aid in keeping the Tremex under control. The remains of 13
. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). 20 NEW YORK STATE MUSEUM nized by its cylindric dark brown abdomen with yellow mark- ings as represented in fig. 1. The female deposits her eggs in the trunks of sickly* trees, where the larvae run large cylindric burrows. Many elms in both Albany and Troy show numerous holes caused in this way. This borer has a deadly parasite in the lunate long sting, Thalessa lunator Fajbr. This beneficial insect is of great aid in keeping the Tremex under control. The remains of 13 ovipositors were found by the writer in the trunk of one small elm. In their efforts to reach the numerous borers in the tree, the females had driven their long ovipositors so far into the wood that thev were unable to withdraw them. Another insect which infests debilitated elms is known as the elm borer, Saperda tridentata 01i\-ier. The larvae of this beetle run their burrows under the bark and in the sapwood of the trunk, not many penetrating to a greater depth than an inch. Their burrows frequently become so numerous as to girdle trees two or three feet in diameter. An infested elm may be recognized by the patches of unhealthy bark; in case of a bad infestation large pieces become loose and scale off easily. The beetle is usually less than ^ inch long, and of a dull slate color, with the thorax and wing-covers margined with dull orange (fig. 2).. a - b Fig. 2Saparda tridentata (twice natural size^ NATURAL, ENEMIES OF ELM LEAF BEETXiE The natural checks serving so well to keep thousands of insects under control which otherwise would be very destructive, are unable to reduce the numbers of this beetle to a relatively harmless figure. One of the more important natural agents is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
Size: 1975px × 1265px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookauthornewyorkstatemuseum, booksubjectnewyorkstatemuseum
