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A GENERAL METHOD FOR ESTIMATING CEREAL APHID POPULATIONS IN SMALL GRAIN FIELDS BASED ON FREQUENCY OF OCCURRENCE

Published online by Cambridge University Press:  31 May 2012

G.L. Hein ,
N.C. Elliott ,
G.J. Michels Jr.  and
R.W. Kieckhefer
G.L. Hein
Affiliation:
University of Nebraska, Panhandle Research and Extension Center, 4502 Avenue I, Scottsbluff, Nebraska, USA 69361
N.C. Elliott
Affiliation:
USDA, ARS, SPA, Plant Science Research Laboratory, 1301 North Western Street, Stillwater, Oklahoma, USA 74075
G.J. Michels Jr.
Affiliation:
Texas A&M University, Agricultural Experiment Station, PO Drawer 10, Bushland, Texas, USA 79012
R.W. Kieckhefer
Affiliation:
USDA, ARS, NPA, Northern Grain Insects Research Laboratory, Rural Route #3, Brookings, South Dakota, USA 57006
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Abstract

Similarities in population parameters among aphid species led us to investigate the potential for a single set of parameters that can be used to develop a ‘generic’ sampling plan for multiple small grain aphid species. A weighted average for the slope and intercept used to relate the proportion of infested tillers to the number of aphids per tiller was determined from the data in 15 published reports. These average parameter estimates were used to predict the number of aphids per tiller in 48 wheat fields sampled for four aphid species. The predicted estimates were regressed on the observed estimates with neither slopes nor intercepts differing significantly from one or zero, respectively. Therefore, it appears the single model is adequate for predicting aphid density for the aphid species tested.

Résumé

La similitude entre les variables démographiques de différentes espèces de pucerons nous a amenés à nous questionner sur la possibilité d’utiliser un seul ensemble de variables pour mettre au point un plan d’échantillonnage ‘générique’ des diverses espèces de pucerons des petits grains. Une moyenne, pondérée en fonction de la pente et de l’intersect, utilisée pour établir le rapport entre la proportion de talles infestées et le nombre de pucerons par talle a été déterminée à partir des données relevées dans 15 rapports publiés. Ces estimations moyennes des variables ont servi à prédire le nombre de pucerons par talle dans 48 champs de blé où quatre espèces de pucerons ont été échantillonnées. La régression entre les estimations obtenues et les valeurs observées avait une pente qui ne différait pas de 1 et un intersect qui ne différait pas de 0. Il semble donc que ce modèle permette de prédire adéquatement la densité des pucerons dans le cas des espèces rencontrées ici.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 1 , February 1995 , pp. 59 - 63
Copyright
Copyright © Entomological Society of Canada 1995

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