. Eastern forest insects. Forest insects. F-486626 Figure 179.—Large pines defoli- ated and killed by Neodiprion taedae linearis, the Arkansas pine needles, one to three eggs per needle, during June or July. The larvae are gregarious and feed primarily on old foliage, usually on exposed trees during July and August, until they become ma- ture and drop to the ground. There is one generation per year Several outbreaks have occurred in jack pine stands in Ontario and Quebec, and heavy tree mortality has occurred. Furthermore, practically all surviving mature trees over many square miles
. Eastern forest insects. Forest insects. F-486626 Figure 179.—Large pines defoli- ated and killed by Neodiprion taedae linearis, the Arkansas pine needles, one to three eggs per needle, during June or July. The larvae are gregarious and feed primarily on old foliage, usually on exposed trees during July and August, until they become ma- ture and drop to the ground. There is one generation per year Several outbreaks have occurred in jack pine stands in Ontario and Quebec, and heavy tree mortality has occurred. Furthermore, practically all surviving mature trees over many square miles remained stag-headed for several years. Some of the most severe infestations in the Lake States have occurred in jack pine planta- tions and windbreaks. Aerial application of a polyhedral virus spray provided satisfactory control for at least one year in tests conducted in Quebec (654). The red-pine sawfly, Neodriprion nautilus nanulus Schedl, oc- curs in many Northeastern States west to Wisconsin and in southeastern Canada west to Saskatchewan. Its favored hosts are red and jack pines, but it also feeds on white, Japanese red, and mugho pines. Full-grown larvae are dull grayish-green to black on top, greenish-white beneath, and about 18 mm. long. The head is black and two olive-green stripes run down the back to a darker area near the rear end. There are two longitudinal dark stripes on each side, with the upper one a little darker than the lower one. Winter is spent in the egg stage. Hatching occurs in early May, and larvae are present until July or August, depending on loca- tion. They are gregarious and usually consume all of the mature needles from one branch before migrating to another. Mature larvae drop to the ground and spin cocoons in the duff. Adults 445. 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 the original
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
