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Factors determining the peak abundance of Metopolophium dirhodum (Homoptera: Aphididae) on cereals

Published online by Cambridge University Press:  10 July 2009

A. Honěk
A. Honěk*
Affiliation:
Research Institute of Plant Production, Department of Entomology, Praha-Ruzyně, Czechoslovakia
*
A. Honěk, Research Institute of Plant Production, Department of Entomology, 161 06 Praha 6 - Ruzyně 507, Czechoslovakia.
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Abstract

From 1986 to 1989, the factors that determined the abundance of Metopolophium dirhodum (Walker) on cereals were studied in western Czechoslovakia. Forty seven sites were selected within cereal fields, mainly of winter wheat. Host plant size and leaf area varied between sites. The maximum abundance of M. dirhodum per tiller varied annually and with host plant stature. The main factor determining maximum abundance was the length of time for which the aphid population grew. M. dirhodum populations differed both in the time of the onset and termination of their growth. On stunted plants population growth started, with little variation, 200 day degrees later than on well developed plants. Within years, nearly all populations ceased growing simultaneously. In years of low or medium aphid abundance it was 40 to 90 day degrees earlier than in aphid outbreak years, and this extension of the population growth was the principal cause of the outbreak. Population growth rates varied slightly with plant quality and differed little between years. They were not important factors determining maximum abundances. 55–75% of the aphids occupied the flag leaves. The lower leaves of well developed plants were more heavily populated than nutritionally and water stressed smaller plants. The population growth rates on particular leaves were related to leaf nitrogen content, but not water content. A relationship for calculating the maximum abundances from a census made during the middle phase of population growth was proposed.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 81 , Issue 1 , March 1991 , pp. 57 - 64
Copyright
Copyright © Cambridge University Press 1991

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