. Hazard-rating systems in forest insect pest management : symposium proceedings, Athens, Georgia, July 31-August 1, 1980. Forest insects Biological control United States Congresses; Forest insects United States Analysis; Forest insects United States Management. low during a cutting cycle, and what stands to monitor for potential problems. In cases where other considerations pro- hibit cutting, the associated risk of loss to SPB outbreak is explicit. For example, stands 10 and 14 in fig- ure 1 are prescribed for seed-tree cutting. But the digit 4 in data field 14 shows that cutting is deferred
. Hazard-rating systems in forest insect pest management : symposium proceedings, Athens, Georgia, July 31-August 1, 1980. Forest insects Biological control United States Congresses; Forest insects United States Analysis; Forest insects United States Management. low during a cutting cycle, and what stands to monitor for potential problems. In cases where other considerations pro- hibit cutting, the associated risk of loss to SPB outbreak is explicit. For example, stands 10 and 14 in fig- ure 1 are prescribed for seed-tree cutting. But the digit 4 in data field 14 shows that cutting is deferred, probably because of coordination of several management goals. The SPB-risk codes in data field 23 (not currently part of the CISC data base) would serve as constant reminders of potential SPB problems in these stands. Without such easily available and explicit infor- mation, especially with the sporadic na- ture of SPB outbreaks, concern for SPB problems soon subsides as infestations Figure 5.—Map of high, medium, and low SPB risk areas on the Catahoula Ran- ger District, Kisatchie National Forest, illustrates the relatively low total acreage and the spatial distribution of high-risk stands. Tests and revisions of this approach to risk-rating stands are continuing on the Kisatchie National Forest. Because CISC does not include data on basal area, method of cut and operability are being used as broad indicators of density. Re- cent revisions of the CISC format will permit inclusion of basal area data (field 22, fig. 1) and entry of SPB risk-rating codes in field 23, if desired. Ideally, prescriptionists would risk-rate stands by applying criteria based on Forest Ser- vice, Region 8 thinning guides and results of a 25-month study of site and stand characteristics associated with SPB infes- tations (Lorio and Sommers 1980). This relatively painless procedure, a first step in dealing with an important but in- termittent pest problem, would result in gradual updating a
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