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Field density estimates of Heliothis virescens (Lepidoptera: Noctuidae) from catches in sex pheromone-baited traps

Published online by Cambridge University Press:  10 July 2009

J.A. Witz
Affiliation:
USDA, ARS, Pest Management Research Unit, College Station, Texas
J.D. Lopez Jr*
Affiliation:
USDA, ARS, Crop Insect Pests Management Research Unit, College Station, Texas
M.A. Latheef
Affiliation:
USDA, ARS, Aerial Application Research Unit, Agricultural Engineering Building, Texas A & M University
*
J.D. Lopez, Jr, USDA-ARS, Crop Insect Pests Management Research Unit, Rt 5, Box 808, College Station, TX 77845, USA.

Abstract

The number of male tobacco budworm, Heliothis virescens (Fabricius), trapped on a daily basis in pheromone traps in individual cotton fields was compared to male and female adult densities measured by nocturnal field sampling. The decline of trap efficiency with increasing female density was demonstrated. A simple relationship for estimating H. virescens male density from the numbers trapped was derived as P♂ = (E2/13)2, where P♂ is density and E2 is the two-day exponential average of number trapped. The standard error for the regression translates to an accuracy ratio of 2:1. The results compare favourably with previous research using mark-release-recapture methodology. Application of the formula is discussed.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 1992

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