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Study of the action of fungi and hymenopterous parasites attacking populations of Sitobion avenae (F.) and Metopolophium dirhodum (Walk.) in an experimental field at Milmort in 1978 and 1979


  • Latteur, G. & Destain, J. (1980). Study of the action of fungi and hymenopterous parasites attacking populations of Sitobion avenae (F.) and Metopolophium dirhodum (Walk.) in an experimental field at Milmort in 1978 and 1979. Bulletin SROP, 3: (4),
Type Journal Article
Year 1980
Title Study of the action of fungi and hymenopterous parasites attacking populations of Sitobion avenae (F.) and Metopolophium dirhodum (Walk.) in an experimental field at Milmort in 1978 and 1979
Journal Bulletin SROP
Recnumber 171
Volume 3
Issue 4
Endnote Keywords natural enemies|parasites|wheat|hosts|cereals|entomopathogens|pathogens|biological control|pest control|control|agricultural entomology|Aphidius frumentarius|cereal aphids|
Abstract Information is presented on the incidence of infection by fungi and parasitism by Hymenoptera of aphids on winter wheat receiving no fungicidal or insecticidal treatments; the information is based on observations in Belgium in 1978-79. The aphid species were Metopolophium dirhodum (Wlk.) and Sitobion avenae (F.). In 1978, although the initial aphid populations were relatively high, they did not develop massively; maximum averages were 0.6-1 aphid/ear. Parasitism was at its highest (18-19%) in the field in late May and early June, whereas infection by Entomophthora spp. was highest (4%) in mid-July. When aphids were brought into the laboratory, the percentage parasitism recorded ranged from 8 in mid-July to 38 in mid-June; 22-25% of the aphids collected in early July were infected by fungi. The parasites reared were principally Aphidius frumentarius Latteur, followed by A. picipes (Nees), Praon volucre (Haal.) and A. ervi Hal. The severe winter of 1978-79 decimated the overwintering populations of S. avenae, and this aphid was not found on wheat until mid-June. Populations of M. dirhodum, however, reached a peak of 18 aphids/plant in mid-July. Parasitism remained low throughout the season, probably due to the absence of S. avenae, which is used as a maintenance host during the spring. Infection by Entomophthora developed late in the season, up to 70% of M. dirhodum and 27.7% of S. avenae being infected by mid-July.
Notes Journal article French
Author address Station de Zoologie Appliquee de l'Etat, Chemin de Liroux, 8, 5800 Gembloux, Belgium.
Fichier
Lien ://19800576217
Authors Latteur, G. & Destain, J.