Résultat de la recherche
23 recherche sur le mot-clé
'cereal aphids' 
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G. Knudsen ; J. Johnson ; D. Eschen | 1990
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Binomial sequential sampling plans usually are more efficient than sampling plans based on counting the number of insects per sample. Our objective was to develop robust binomial sequential sampling plans based on a range of action thresholds fo[...]
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H. Havlickova | 1997Two winter wheat cultivars, Regina and Zdar, cultivated in greenhouse, were evaluated in relation to the changes in the leaf physiology, chlorophyll content and yield characteristics under cereal aphid stress. The significant reduction of leaf a[...]
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S. Moharramipour ; H. Tsumuki ; K. Sato ; H. Yoshida | 1997A set of 150 doubled-haploid (DH) barley (Hordeum vulgare L.) lines derived from the cross of Harrington/TR306 was used to determine the number and chromosomal location of quantitative trait loci (QTLs) controlling resistance to cereal aphids. T[...]
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L. Elberson ; J. Johnson | 1995Weekly sampling of Diuraphis noxia ia (Kurdjumov) infesting wheat and barley at four sites in northern Idaho was conducted during the growing seasons from 1989 to 1992. Infestations were higher in the spring-planted than in the fall-planted cere[...]
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D. Schotzko ; N. Bosqueperez | 2000Field experiments were conducted in 1997 and 1998 to evaluate the impact of resistance to Russian wheat aphid, Diuraphis noxia (Mordvilko), on the cereal aphid complex in wheat. Two spring wheats were planted: the variety ''Centennial'' (Russian[...]
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M. Feng ; R. Nowierski | 1992
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H. Havlickova ; J. Moravcova | 1998The sugar metabolism of five winter wheat cultivars (Hana, Regina, Sparta, Viginta and Zdar) infested by the cereal aphids Metopolophium dirhodium (Wlk.), Rhopalosiphum padi (L.) and Sitobion avenae (F.) was assessed during two vegetative season[...]
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J. Simon ; C. Dedryver ; J. Pierre ; S. Tanguy ; P. Wegorek | 1991
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S. Duffield ; R. Bryson ; J. Young ; R. Sylvesterbradley ; R. Scott | 1997The effect of nitrogen fertiliser on populations of the cereal aphids Sitobion avenae and Metopolophium dirhodum on winter wheat was investigated in a three year field experiment. Naturally occurring aphid populations were monitored on three nit[...]
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T. Voss ; R. Kieckhefer ; B. Fuller ; M. Mcleod ; D. Beck | 1997Populations of the English grain aphid, Sitobion avenae (F.), and the bird cherry-oat aphid, Rhopalosiphum padi (L.), develop in some years on maturing wheat, Triticum aestivum (L.), in the Dakotas and western Minnesota. Two experiments were con[...]
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M. Maudsley ; A. Mackenzie ; J. Thacker ; A. Dixon | 1996Long sequences of data on the incidence of cereal aphids from five European countries were analysed for evidence of density dependent processes occurring between years. Using a randomisation test (Pollard, Lakhani & Rotheray, 1987), density depe[...]
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Insect herbivores that have high impacts on their host plants reduce the longevity of their habitats and require dispersal mechanisms. This hypothesis was tested by comparing the life history traits, particularly short- and long-distance dispers[...]
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S. Moharramipour ; H. Tsumuki ; K. Sato ; S. Murata ; K. Kanehisa | 1997Using four marker genotypes of F-2 hybrids derived from crosses between aphid resistant and susceptible barley lines, the effects of leaf color, epicuticular wax and gramine indole alkaloid on aphid infestation were studied in natural population[...]
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A. Mayoral ; W. Tjallingii ; P. Castanera | 1996The feeding behaviour of Diuraphis noxia (Kurdjumov) (Homoptera: Aphididae) was electronically monitored on five cereal species (Triticum aestivum L., T. turgidum L., Secale cereale L. and x Triticosecale Wittmack) containing different hydroxami[...]
