Seasonal activity and distribution of cereal aphid parasitoids in Belgium

Entomophaga ◽  
1997 ◽  
Vol 42 (1-2) ◽  
pp. 185-191 ◽  
Author(s):  
A. Langer ◽  
D. Stilmant ◽  
D. Verbois ◽  
Th. Hance
Keyword(s):  
Seasonal Activity ◽  
Cereal Aphid ◽  
Aphid Parasitoids

Diversity of cereal aphid parasitoids in simple and complex landscapes

2008 ◽  
Vol 126 (3-4) ◽  
pp. 289-292 ◽  
Author(s):  
Ines M.G. Vollhardt ◽  
Teja Tscharntke ◽  
Felix L. Wäckers ◽  
Felix J.J.A. Bianchi ◽  
Carsten Thies
Keyword(s):  
Cereal Aphid ◽  
Aphid Parasitoids ◽  
Complex Landscapes

scholarly journals Fungal grass endophytes, grass cultivars, nitrogen deposition and the association with colonising insects

2007 ◽  
Vol 13 ◽  
pp. 53-57
Author(s):  
J. Krauss ◽  
S.A. Härri ◽  
L. Bush ◽  
S.A. Power ◽  
C.B. Müller
Keyword(s):  
Field Experiment ◽  
Nitrogen Deposition ◽  
Fungal Endophytes ◽  
Nitrogen Addition ◽  
Aphid Species ◽  
Specific Response ◽  
Cereal Aphid ◽  
Pasture Grasses ◽  
Aphid Parasitoids ◽  
Endophyte Infection

Fungal endophytes associated with pasture grasses can have community-wide effects on insect consumers. Here we asked the question to what degree endophyte infection, simulated nitrogen deposition and grass cultivar influence the abundance of colonising herbivores and their natural enemies. In a fully randomised field experiment, consisting of four Lolium perenne monocultures of known endophyte infection status and a nitrogen addition treatment, we determined the abundance of colonising aphids, their parasitoids and predators, and other grass herbivores. The three colonising cereal aphid species did not respond to endophyte infection, possibly because peramine concentrations were relatively low (3.9 μg/g). There was a significant interaction between nitrogen addition and plant cultivar on the abundance of Sitobion avenae, suggesting a cultivar-specific response to nitrogen addition. Aphid predators were affected by an interaction between endophyte and plant cultivar, but abundance of aphid parasitoids and other grass herbivores was not affected by any treatment. The fungus Claviceps purpurea naturally infected our experimental plants and infection rates differed among cultivars and were more likely to occur on endophyte-infected plants, in particular on wild-type Samson. We conclude that strong effects of endophytes on insect abundance may not occur in systems built upon L. perenne because overall peramine levels rarely reach threshold levels for insect toxicity. Keywords: fungal endosymbionts, multitrophic interactions, field experiment, insect food webs, alkaloids

scholarly journals Landscape complexity is not a major trigger of species richness and food web structure of European cereal aphid parasitoids

BioControl ◽  
2015 ◽  
Vol 60 (4) ◽  
pp. 451-461 ◽  
Author(s):  
Violetta Hawro ◽  
Piotr Ceryngier ◽  
Teja Tscharntke ◽  
Carsten Thies ◽  
Vesna Gagic ◽  
...  
Keyword(s):  
Species Richness ◽  
Food Web ◽  
Cereal Aphid ◽  
Food Web Structure ◽  
Landscape Complexity ◽  
Web Structure ◽  
Aphid Parasitoids

Identification of cereal aphid parasitoids by epicuticular lipid analysis

1992 ◽  
pp. 349-350
Author(s):  
L. C. Irvin ◽  
R. D. Eikenbary ◽  
R. K. Campbell ◽  
W. S. Fargo ◽  
J. W. Dillwith
Keyword(s):  
Lipid Analysis ◽  
Cereal Aphid ◽  
Aphid Parasitoids

Migration of parasitoids (Hymenoptera: Braconidae) of cereal aphids (Hemiptera: Aphididae) between grassland, early-sown cereals and late-sown cereals in southern England

1987 ◽  
Vol 77 (4) ◽  
pp. 555-568 ◽  
Author(s):  
V. T. Vorley ◽  
S. D. Wratten
Keyword(s):  
Barley Yellow Dwarf Virus ◽  
Rhopalosiphum Padi ◽  
Cereal Aphids ◽  
Cereal Aphid ◽  
Wheat Field ◽  
Southern England ◽  
Increased Risk ◽  
Aphid Parasitoids ◽  
Yellow Dwarf Virus ◽  
Cereal Fields

AbstractThe dynamics of migration of the parasitoids Aphidius spp. between grassland and cereal fields of varying sowing dates was investigated in southern England in 1980 and 1981. Using baffled water traps, direct evidence of migration of A. rhopalosiphi De Stefani Perez females from grassland to winter wheat was obtained in June 1980, suggesting that the early-maturing grassland aphid Metopolophium festucae (Theobald) can act as a reservoir of cereal aphid parasitoids. In 1981, estimates of parasitoid production in cereal fields containing the aphids Sitobion avenae (F.), M. dirhodum (Walker) and Rhopalosiphum padi (L.) were compared with actual numbers to calculate net immigration and emigration. Barley and early-sown wheat (drilled before 14 October) proved to be significant sources of Aphidius spp., with one wheat field generating sufficient parasitoids in May to account for immigration into about 25 late-sown fields. Parasitoid migration as larvae inside aphid alatae was apparently of considerably less significance than that by adults, which were predominantly female. The advantages of early drilling of cereals to form ‘semi perennial’ reservoirs of beneficial insects is discussed and weighed against the corresponding disadvantages, especially an increased risk of barley yellow dwarf virus (BYDV).

Variability in the Development of Cereal Aphid Parasitoids and Hyperparasitoids in Oceanic Regions as a Response to Climate and Abundance of Hosts

1997 ◽  
Vol 26 (3) ◽  
pp. 545-551 ◽  
Author(s):  
Liliane Krespi ◽  
Charles-Antoine Dedryver ◽  
Veronique Creach ◽  
Jean-Michel Rabasse ◽  
Anne Le Ralec ◽  
...  
Keyword(s):  
Cereal Aphid ◽  
Aphid Parasitoids
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