. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. ial for Ips (before the advent of lumbering) is rare, and, in the case of wiild throw mater- ial and logging slash, it can be colonized by the beetles immediately after it is located. Consequently, there is a discernible advantage for the first colonizers to repel other species and to reserve the habitat. In contrast, the southern Ips species often attack standing trees and successful colonization depends on overwhelming the tree's resis
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. ial for Ips (before the advent of lumbering) is rare, and, in the case of wiild throw mater- ial and logging slash, it can be colonized by the beetles immediately after it is located. Consequently, there is a discernible advantage for the first colonizers to repel other species and to reserve the habitat. In contrast, the southern Ips species often attack standing trees and successful colonization depends on overwhelming the tree's resistance mechanisms as rapidly as possible. Rapid attack, facilitated by pheromone cross-attraction, favors the sur- vival of all attacking species. Inhibitive pheromone interactions must be looked for in delimiting areas of the trees that are at- tacked by each species. There are no obvious pheromonal interac- tions that can be exploited as novel control strategies in the southern species studied. However, in studying interactions between species, we have been forced to sample entire attacked trees, to evaluate the involvement of several species of Scolytidae in the phenom- enon of tree killing and colonization, and hence to recognize that "the southern pine beetle problem" is not synonymous with D. frontalis. It should also be possible to predict which species are most likely to use competitive inhibition from when and what host material they attack. 40 2 30 < 20 in O CL- IO 1 stump. K-V'] Dendroctonus frontalis Ips calligraphus HI Ips avulsus 4 5 6 TREE SECTION. 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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