. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. DAT E COLLECTED Figure 3.—Percent parasitism of gypsy moth larvae at Hawk Mountain by Parasetigena silvestris in 1974, 1975, and Figure 4.—Percent parasitism of gypsy moth larvae at Hawk Mountain by Blepharipa pratensis in 1974, 1975, and 1976. when at its peak. The abundance of this parasite is in contrast to reports of some previous studies in the Barbosa et al, (1975) reported only 12 out of nearly 4000 larvae were parasit
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. DAT E COLLECTED Figure 3.—Percent parasitism of gypsy moth larvae at Hawk Mountain by Parasetigena silvestris in 1974, 1975, and Figure 4.—Percent parasitism of gypsy moth larvae at Hawk Mountain by Blepharipa pratensis in 1974, 1975, and 1976. when at its peak. The abundance of this parasite is in contrast to reports of some previous studies in the Barbosa et al, (1975) reported only 12 out of nearly 4000 larvae were parasitized by P. silvestris, and Tigner (1974) found that numbers of P. silvestris were always relatively small in sites studied in New York. In a much earlier study in Hungary, Crossman (1924) found that P. silvestris was by far the most abundant parasite of the late instars, killing about 40 percent of them. Figure 5 shows the total parasitism of larvae and pupae at Hawk Mountain during each of the 3 years. With the exception of 1974, when A. melanosoelus was abundant, the gypsy moth larvae were relatively free of parasites during the first month after hatch. Parasit- ism of large larvae was much greater, peaking each year at about 70 percent of the larvae collected. Crossman (1924) also reported tachinid parasitism of the last two larval stages of an L. dispar population in Hungary to exceed 70 percent. This peak parasitism is occurring in large larvae nearing pupation. At that time, the larval population is at its 131. 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 International Congress of Entomology (15th : 1976 : Washington, D. C. ). Washington : United States Dept. of Agriculture, Forest Service
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