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Entomology

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Selected Works

Selected Works

1991

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Overwintering Egg Populations Of A Pine Sawfly, Neodiprion Autumnalis, On Ponderosa Pine Near Gillette, Wyoming, Judith Pasek Apr 1991

Overwintering Egg Populations Of A Pine Sawfly, Neodiprion Autumnalis, On Ponderosa Pine Near Gillette, Wyoming, Judith Pasek

Judith E Pasek

In 1990, a number of outbreaks of the pine sawfly, Neodiprion autumnalis, were reported in eastern Wyoming and western South Dakota. Overwintering egg populations were surveyed near Gillette, Wyoming, to assess potential for defoliation in 1991. The sawfly population appears to be collapsing at the infestation center and defoliation can be expected to be light to moderate near site 1 in 1991. Defoliation is expected to be heavy to severe up to 25 miles away from the infestation center (sites 2 and 3) with mass starvation of larvae likely. High mortality from starvation and other factors, such as parasites …

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Sampling Windbreaks For Borers And Defoliators, Judith E. Pasek Apr 1991

Sampling Windbreaks For Borers And Defoliators, Judith E. Pasek

Judith E Pasek

Development of sampling methods to detect, assess, and study insect populations in windbreaks depends upon knowledge of insect life cycles, habits, and distributions, habitat characteristics, and sampling objectives. Techniques ranging from detection surveys to population estimates have been developed for cankerworms, pine tip moths, carpenterworms, and lilac borers.

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Overwintering Egg Populations Of A Pine Sawfly, Neodiprion Autumnalis, On Ponderosa Pine Near Ft. Meade In South Dakota, Judith Pasek Mar 1991

Overwintering Egg Populations Of A Pine Sawfly, Neodiprion Autumnalis, On Ponderosa Pine Near Ft. Meade In South Dakota, Judith Pasek

Judith E Pasek

In 1990, a number of outbreaks of the pine sawfly, Neodiprion autumnalis, were reported in western South Dakota and eastern Wyoming. Overwintering egg populations were surveyed near Ft. Meade, South Dakota to assess potential for defoliation in 1991. Defoliation in 1991 is expected to be severe at the infestation center with mass starvation of larvae likely. High mortality from starvation and other factors, such as parasites and predators, may contribute to collapse of the population in 1992. Tree mortality is not likely to result from defoliation alone, but drought stress and subsequent infestation by Ips bark beetles may cause …

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Populations Of Douglas-Fir Beetle In Scorched And Green Trees 2 Years Following The Clover Mist Fire On The Clarks Fork Ranger District, Shoshone National Forest, Wyoming, Judith E. Pasek Dec 1990

Populations Of Douglas-Fir Beetle In Scorched And Green Trees 2 Years Following The Clover Mist Fire On The Clarks Fork Ranger District, Shoshone National Forest, Wyoming, Judith E. Pasek

Judith E Pasek

In 1990, Douglas-fir beetle (DFB), Dedroctonus pseudotsugae Hopkins spread from Douglas-firs blackened by the 1988 Clover Mist Fire to partially scorched and green trees on the Clarks Fork Ranger District, Shoshone National Forest in northwestern Wyoming. Adult DFB began emerging in early May and peaked during June. Scorched trees were attacked first and green trees were selected generally after mid-June. A mean of 20 DFB emerged per 36 sq. in. of heavily-infested bark surface.

Total brood production in fall bark samples taken at 5-7 ft. was high, averaging 28 DFB per 36 sq. in., and represents a 1.5- to 2-fold …

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