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YIELD OF SPRING WHEAT IN RELATION TO LEVEL OF INFESTATION BY GREENBUGS (HOMOPTERA: APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

R.W. Kieckhefer ,
N.C. Elliott ,
W.E. Riedell  and
B.W. Fuller
R.W. Kieckhefer
Affiliation:
USDA, ARS Northern Grain Insects Research Laboratory, Rural Route #3, Brookings, South Dakota, USA 57006
N.C. Elliott
Affiliation:
USDA, ARS Northern Grain Insects Research Laboratory, Rural Route #3, Brookings, South Dakota, USA 57006
W.E. Riedell
Affiliation:
USDA, ARS Northern Grain Insects Research Laboratory, Rural Route #3, Brookings, South Dakota, USA 57006
B.W. Fuller
Affiliation:
USDA, ARS Northern Grain Insects Research Laboratory, Rural Route #3, Brookings, South Dakota, USA 57006
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Abstract

The effect of greenbug, Schizaphis graminum (Rondani), infestations on yield components of early- and late-planted spring wheat, Triticum aestivum L., were measured in 2 successive years in eastern South Dakota. Greenbug populations in plots generally increased rapidly and peaked when wheat plants were in boot stage. Populations then began a steady decrease until anthesis, at which time they were near zero. The number of seeds per spikelet and the number of spikelets per square metre were consistently significantly negatively correlated with aphid-days, whereas average seed weight was significantly negatively correlated with aphid-days for only one planting. A linear regression model that included different intercepts for each spring wheat planting and a common slope relating yield to greenbug feeding days (aphid-days) provided a good fit to the data. Based on the model, a loss of 41 kg of grain per hectare is expected for each 100 aphid-days that accumulate per tiller.

Résumé

Les dommages causés par les infestations du Puceron vert des graminées, Schizaphis graminum (Rodani), sur la production du blé, Triticum aestivum L., planté tôt ou tard au printemps, ont été mesurés au cours de deux années successives dans l’est du Dakota du Sud. Les populations de pucerons augmentaient généralement rapidement dans les grilles échantillons et atteignaient leur densité maximale à l’apparition de la gaine sur les plants de blé. Les populations se mettaient alors à diminuer progressivement jusqu’à l’anthèse alors que les densités devenaient presque nulles. Le nombre de graines par épi et le nombre d’épis par mètre carré étaient toujours en corrélation négative significative avec les pucerons-jours, alors que la masse moyenne des graines était en corrélation négative significative avec les pucerons-jours seulement dans une plantation. Un modèle de régression linéaire comportant différents intercepts pour chaque plantation de blé et une pente commune reliant la production au nombre de jours d’alimentation des pucerons (pucerons-jours) s’ajustait bien aux données. D’après ce modèle, il faut s’attendre à une perte de 41 kg de grain par hectare pour chaque tranche de 100 pucerons-jours qui s’accumulent par talle de blé.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 1 , February 1994 , pp. 61 - 66
Copyright
Copyright © Entomological Society of Canada 1994

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