Results 121 to 130 of about 392 (155)
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Starch Characteristics of Aphid (Metopolophium dirhodum) Infested Barley
Starch - Stärke, 1989AbstractStarch was isolated from barley (cv. Triumph) which had been infested with the rose‐grain aphid Metopolophium dirhodum. Physico‐chemical properties and functional characteristics of the starches and a control starch were studied. Amylograph curves indicated higher residual α‐amylase activity on the control starch than on starch samples isolated
K. Lorenz, Fort Collins
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On the Ecological Genetics of Metopolophium dirhodum (Walker) (Hemiptera, Aphididae)
Zeitschrift für Angewandte Entomologie, 1985AbstractAbout 120 clones of Metopolophium dirhodum (Walker) were established from aphids, which were sampled from barley, wheat and oat fields in Germany. All clones were analysed for their host plant adaptation (population increase in 12 days ‐ P12) to barley, wheat and oat and for their life cycle strategy. M.
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Annals of Applied Biology, 1995
SummarySome cereal seedlings exhibit antibiotic and antixenotic resistance to the aphids Metopolophium dirhodum (Walker) and Rhopalosiphum padi (L.), because the seedlings contain hydroxamic acids or gramine. The association between tolerance to aphids and aphid antibiosis was investigated for three cereals, Dollarbird wheat Vulcan wheat and Yagan ...
R J. Lamb, P A. Mackay
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SummarySome cereal seedlings exhibit antibiotic and antixenotic resistance to the aphids Metopolophium dirhodum (Walker) and Rhopalosiphum padi (L.), because the seedlings contain hydroxamic acids or gramine. The association between tolerance to aphids and aphid antibiosis was investigated for three cereals, Dollarbird wheat Vulcan wheat and Yagan ...
R J. Lamb, P A. Mackay
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Effects of Metopolophium dirhodum on Spring Wheat in the Glasshouse
Plant Pathology, 1974SUMMARY Pot‐grown plants of spring wheat, cultivar Maris Dove, Were subjected, commencing at ear emergence, to different, constant levelsof infestation hy Metopolophium dirhodum (Wlk.) in a glasshouse.
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Annals of Applied Biology, 1977
SUMMARYThe reproduction of apterous and alate morphs of the aphidsSitobion avenaeandMetopolophium dirhodumis compared on the basis of fecundity in 5‐ and 10‐day periods of adult life. Apterae of both species are consistently more fecund than alatae of comparable weight, producing about three more nymphs on average in any 5‐day period.
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SUMMARYThe reproduction of apterous and alate morphs of the aphidsSitobion avenaeandMetopolophium dirhodumis compared on the basis of fecundity in 5‐ and 10‐day periods of adult life. Apterae of both species are consistently more fecund than alatae of comparable weight, producing about three more nymphs on average in any 5‐day period.
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Annals of Applied Biology, 1979
SUMMARYApterous Sitobion avenae on oats were found to have a higher reproductive rate on the ears (5–95 nymphs per day) than on young leaves (3–78 nymphs per day), mature leaves (2–17 nymphs per day) or senescent leaves (2–08 nymphs per day). At each growth stage of the the host plant large aphids gave birth to more young than small aphids, but aphids ...
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SUMMARYApterous Sitobion avenae on oats were found to have a higher reproductive rate on the ears (5–95 nymphs per day) than on young leaves (3–78 nymphs per day), mature leaves (2–17 nymphs per day) or senescent leaves (2–08 nymphs per day). At each growth stage of the the host plant large aphids gave birth to more young than small aphids, but aphids ...
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Environmental Entomology, 1991
A spore shower technique was used to test four species of aphid-derived entomophthoralean fungi, Pandora neoaphidis (Remaudiere & Hennebert) Humber, Zoophthora radicans (Brefeld) Batko, Conidiobolus thromboides Drechsler, and Conidiobolus coronatus (Constantin) Batko, against the cereal aphids, Diuraphis noxia (Mordvilko) and Metopolophium dirhodum ...
Ming-Guang Feng, James B. Johnson
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A spore shower technique was used to test four species of aphid-derived entomophthoralean fungi, Pandora neoaphidis (Remaudiere & Hennebert) Humber, Zoophthora radicans (Brefeld) Batko, Conidiobolus thromboides Drechsler, and Conidiobolus coronatus (Constantin) Batko, against the cereal aphids, Diuraphis noxia (Mordvilko) and Metopolophium dirhodum ...
Ming-Guang Feng, James B. Johnson
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Journal of Economic Entomology
Abstract The rose-grain aphid, Metopolophium dirhodum (Walker), has been identified as a predominant aphid species in wheat agroecosystems. Flonicamid, a novel pyridinamide insect growth regulator, has demonstrated high efficacy against various sap-sucking pests.
Xinan Li +8 more
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Abstract The rose-grain aphid, Metopolophium dirhodum (Walker), has been identified as a predominant aphid species in wheat agroecosystems. Flonicamid, a novel pyridinamide insect growth regulator, has demonstrated high efficacy against various sap-sucking pests.
Xinan Li +8 more
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Journal of Applied Entomology, 1987
AbstractBy using the number of antennal segments, the relative length of the individual segments, and supplemented by some morphological details, it should be possible to determine the different apterous instars of the rose‐grain aphid.ZusammenfassungBestimmungsschlüssel für aptere Stadien der Aphide, Metopolophium dirhodum (Wlk.)Mit Hilfe der Anzahl ...
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AbstractBy using the number of antennal segments, the relative length of the individual segments, and supplemented by some morphological details, it should be possible to determine the different apterous instars of the rose‐grain aphid.ZusammenfassungBestimmungsschlüssel für aptere Stadien der Aphide, Metopolophium dirhodum (Wlk.)Mit Hilfe der Anzahl ...
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Annals of Applied Biology, 1978
SUMMARYThe effects of feeding site of Sitobion avenae and Metopolophium dirhodum on grain weight, number and nitrogen content were investigated in the laboratory and in the field. When the latter species was confined to particular leaves in a growth room, grain weight reductions occurred only when the aphid fed on the flag leaf; reductions in ...
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SUMMARYThe effects of feeding site of Sitobion avenae and Metopolophium dirhodum on grain weight, number and nitrogen content were investigated in the laboratory and in the field. When the latter species was confined to particular leaves in a growth room, grain weight reductions occurred only when the aphid fed on the flag leaf; reductions in ...
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