What affects the rate of gypsy moth (Lepidoptera: Lymantriidae) spread: winter temperature or forest susceptibility

1 - The effect of winter temperature and forest susceptibility on the rate of gypsy moth Lymantria dispar (L.) range expansion in the lower peninsula of Michigan was analysed using historical data on moth counts in a grid of pheromone-baited traps collected from 1985 to 1994 by the Michigan Departme...

Full description

Saved in:
Bibliographic Details
Published in:Agricultural and forest entomology 1999-02, Vol.1 (1), p.37-45
Main Authors: Sharov, A.A, Pijanowski, B.C, Liebhold, A.M, Gage, S.H
Format: Article
Language:English
Subjects:
ambient temperature
biological resistance
botanical composition
boundaries
forests
geographical distribution
host plants
invasion
Lymantria dispar
population boundaries
population density
population threshold
spread
winter
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:1 - The effect of winter temperature and forest susceptibility on the rate of gypsy moth Lymantria dispar (L.) range expansion in the lower peninsula of Michigan was analysed using historical data on moth counts in a grid of pheromone-baited traps collected from 1985 to 1994 by the Michigan Department of Agriculture. The rate of spread was measured by the distance between population boundaries in consecutive years. Boundaries were estimated for population thresholds of 1, 3, 10, 30, and 100 moths per trap using a polar coordinate system. 2 - The average rate of spread estimated using all population thresholds was 15.8 km/yr. 3 - The rate of spread was higher in the northern part of the lower peninsula than in the southern part, despite lower minimum January temperatures in the north. 4 - The rate of spread was positively correlated with forest susceptibility, which was higher in the north than in the south.
ISSN:1461-9555
1461-9563
DOI:10.1046/j.1461-9563.1999.00006.x