Rating the Susceptibility of Stands to Southern Pine Beetle Attack

G.N. Mason - Research Coordinator, IPM RD&A Program for Bark Beetles of Southern Pines,
P.L. Lorio, Jr. - Project Leader and Supervisory Soil Scientist, Forest Insect Research, USDA Forest Service, Southern Forest Experiment Station, Pinesville, LA,
R.P. Belanger - Principal Silviculturist, USDA Forest Service, Southeastern Forest Experiment Station, Athens, GA, and
W.A. Nettleton - Entomologist, Forest Pest Management, USDA Forest Service, Southern Region, State and Private Forestry, Pineville, LA.

Integrated Pest Management Handbook, USDA, Forest Service, Agriculture Handbook No. 645, April 1985.

Model Summaries - MS Hazard B

Description

Kushmaul et al. (1979) developed three models using discriminant analysis procedures on baseline and infested plot data from Mississippi, Louisiana, and Arkansas. Nebeker and Honea (1984) modified these models and divided the discriminant scores into five classes to produce MS Hazard B. During tests in 1983, 66 percent of 11 stands on which spots occurred were classed as being high or very high Hazard.

Inputs

1) Pine basal area (square feet per acre)
2) Total basal area (square feet per acre)
3) Stand age (years)
4) Stand density (number of pine trees per acre)
5) Site index (base 50)

A Hazard score that indicates the relative susceptibility to SPB attack is determined as follows:

Score =

1.8342 (pine basal area) + 0.4085 (total basal area)
+ 0.705 (age)+ 0.002 (stand density)
+ 0.88 (site index) - 206.315

Outputs

A Hazard class is determined from the Hazard score as follows:

	Score	Hazard class
	>219	Very high
	168-219	High
	62-167	Medium
	11-61	Low
	<11	Very low

General Reference

Nebeker and Honea 1984.

For additional information, contact

Dr. T.E. Nebeker
Drawer EM
Mississippi State University
Mississippi State, MS 39762
Telephone: (601) 325-2085

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Developed by the University of Georgia Bugwood Network in cooperation with USDA Forest Service - Forest Health Protection, USDA APHIS PPQ, Georgia Forestry Commission, Texas Forest Service
and the Pests and Diseases Image Library - Australia

Last updated on Wednesday, August 09, 2006 at 11:51 AM
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