. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. 1890 1900 1910 1920 1930 1940 LOG Nt+1 1- 2- 3H • • / # • / • • • / / •• • • /» • • I • • •• / • . / • B s l • / • / • • y. * • • B 1 0 1 LOG Nt Figure 2. Fluctuations of the pupal density of the pine looper (log numbers per m2) at Letz- lingen, Germany, 1881-1940 (A) and correlation between successive pupal densities of the same population (See text.) 9. Please note that these images are extracted from scanned page images that may h
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. 1890 1900 1910 1920 1930 1940 LOG Nt+1 1- 2- 3H • • / # • / • • • / / •• • • /» • • I • • •• / • . / • B s l • / • / • • y. * • • B 1 0 1 LOG Nt Figure 2. Fluctuations of the pupal density of the pine looper (log numbers per m2) at Letz- lingen, Germany, 1881-1940 (A) and correlation between successive pupal densities of the same population (See text.) 9. 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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