. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. visible indication of the presence of pests. Sampling involves a variety of methods suit- able to the particular pest stage sampled. Foliage may be removed from tree crowns (with pole clippers or a line thrower) and examined (fig. 5), or beating samples may be taken. Light traps and pheromone traps are used, although interpretation of numbers of insects trapped is uncertain. However, traps of this type are useful for detecting the presen
. Current topics in forest entomology : selected papers from the XVth International Congress of Entomology, Washington, , 1976. Forest insects Congresses. visible indication of the presence of pests. Sampling involves a variety of methods suit- able to the particular pest stage sampled. Foliage may be removed from tree crowns (with pole clippers or a line thrower) and examined (fig. 5), or beating samples may be taken. Light traps and pheromone traps are used, although interpretation of numbers of insects trapped is uncertain. However, traps of this type are useful for detecting the presence of a particular species. They are relatively inexpensive and some limited con- clusions may be drawn regarding numbers. Per- manent sampling plots, while not as useful a detection procedure as "blind" or random samp- ling, do provide good information on year-to year population trends; however, the high costs of permanent sampling plots require a close look at their cost/benefit status. It is difficult to state just where re- mote sensing stands in relation to forest insect pest detection. There seems to have been some oversell concerning satellite cap- ability for detecting forest insect outbreaks, and methods have not yet been developed for. Figure 5.—A forest research technician with the Forest Insect and Disease Survey is shown using a pole clipper and basket to collect spruce budworm infested foliage from the mid- crown of a balsam fir tree. A basket is used to prevent loss of active, later instar larvae (when they are in the later stages of growth). 27. 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
Size: 1579px × 1582px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
