Life Sciences Commons^™

Trends In Overwintering Egg Populations Of A Pine Sawfly, Neodiprion Autumnalis, On Ponderosa Pine Sampled In January And December 1991 Near Ft. Meade In South Dakota, Judith E. Pasek, Willis C. Schaupp Jr

Judith E Pasek

In 1990 and 1991, a number of outbreaks of the pine sawfly, Neodiprion autumnalis, were reported in western South Dakota and eastern Wyoming. Near Ft. Meade in South Dakota, defoliation in 1990 was heavy at the center of the infestation and decreased to light defoliation at a distance of 1 mile from the center. Defoliation at the same location in 1991 appeared to range from heavy to moderate.

Three sites near Ft. Meade that were sampled in January 1991 were resurveyed in December 1991 to assess changes in overwintering egg populations and degree of defoliation and to determine the potential …

Populations Of Douglas-Fir Beetle In Green Trees Three Years After The Clover Mist Fire On The Clarks Fork Ranger District, Shoshone National Forest, Wyoming, Judith Pasek, Willis Schaupp

Judith E Pasek

Brood densities of Douglas-fir beetle (DFB), Dendroctonus pseudotsugae Hopkins, in green trees adjoining areas burned by the 1988 Clover Mist Fire varied by site, but averaged 8 per 36 sq. in. for bark samples at all sites examined during November 1991. Brood densities were much reduced from 1990 levels, but were similar to densities found in blackened trees in fall 1989. The reduction from 1990 levels was attributed to heavy winter mortality of brood caused by prolonged extreme cold temperatures. Most brood in fall 1991 samples was present in the callow adult stage, similar to 1989 samples, and in contrast …

Status And Trends Of Mountain Pine Beetle Populations In The Bear Mountain And White House Gulch Areas On The Harney Ranger District, Black Hills National Forest, South Dakota, Judith E. Pasek, Willis C. Schaupp Jr

Judith E Pasek

Increasing and epidemic populations of the mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae) were detected and evaluated in the southcentral Black Hills. Mortality of ponderosa pine, Pinus ponderosa Dougl. ex Laws., in the area increased each year since 1988 and was six times greater in 1991 than in 1989. Survey results indicate an average of 29 trees killed per acre by this bark beetle from 1989 through 1991 in the Bearhouse project area. Infestation is especially concentrated in the Bear Mountain Basin area, where between 27 and 103 trees per acre have been killed, and a large beetle population …

Incorporating Pest Information Into Forest Planning: Personal Experience From The Black Hills, Judith E. Pasek

Judith E Pasek

Paper presented at the 40th Annual Western International Forest Disease Work Conference.