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J. Sandstrom ; J. Pettersson | 1994The performance of five clones of the pea aphid, Acyrthosiphon pisum, was evaluated on red clover, Trifolium pratense, alfalfa, Medicago sativa, broad bean, Vicia faba and five genotypes of pea, Pisum sativum. Phloem sap samples were collected f[...]
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K. Forslund ; J. Pettersson ; T. Bryngelsson ; L. Jonsson | 2000The effect of infestation by the birdcherry-oat aphid (Rhopalosiphum padi L.), on induction of PR-proteins was investigated in barley (Hordeum vulgare L.), using barley lines susceptible or resistant to R. padi, The PR-proteins PR-1 a (unknown f[...]
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K. Chamberlain ; E. Guerrieri ; F. Pennacchio ; J. Pettersson ; J. Pickett ; G. Poppy ; W. Powell ; L. Wadhams ; C. Woodcock | 2001Aphids, through their close association with plants, cause systemic release of semiochemicals. These may have negative effects on subsequent aphid colonisation and can also have positive roles with insects that are antagonistic to aphid developm[...]
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R. Glinwood ; J. Pettersson | 1999
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R. Glinwood ; J. Pettersson | 2000Host choice and winter-host leaving in emigrants of bird cherry-oat aphid, Rhopalosiphum padi (Linnaeus), were investigated in the laboratory. In settling choice tests, emigrants collected from the winter host, Prunus padus, preferred this plant[...]
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C. Johansson ; J. Pettersson ; H. Niemeyer | 1997In olfactometric experiments a wingless adult of Sitobion avenae was attracted by odours of a wingless adult of Rhopalosiphum padi feeding on a wheat plant. When the stimulus consisted of either a wingless R. padi without plant material or a whe[...]
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M. Birkett ; C. Campbell ; K. Chamberlain ; E. Guerrieri ; A. Hick ; J. Martin ; M. Matthes ; J. Napier ; J. Pettersson ; J. Pickett ; G. Poppy ; E. Pow ; B. Pye ; L. Smart ; G. Wadhams ; L. Wadhams ; C. Woodcock | 2000
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J. Pettersson ; A. Quiroz ; D. Stephansson ; H. Niemeyer | 1995
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A. Givovich ; J. Sandstrom ; H. Niemeyer ; J. Pettersson | 1994Phloem sap of wheat seedlings differing in whole leaf hydroxamic acid (Hx) concentrations was collected by cutting stylets of feeding aphids. DIMBOA-glucoside was the only Hx-related product found. Concentration of DIMBOA-glucoside in phloem sap[...]
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J. Pettersson ; S. Karunaratne ; E. Ahmed ; V. Kumar | 1998Olfactometer experiments were conducted with apterae and alatae of the cowpea aphid, Aphis craccivora, Koch (Hom.: Aphidoidea). The occurrence of density dependent related pheromones and odour response to their host plant Vigna unguiculata was s[...]
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J. Sandstrom ; J. Pettersson | 2000The host alternating aphid, Rhopalosiphum padi (L.), feeds in summer on several different species of grasses but is monophagous on its winter host, Prunus padus L. The monophagy on P. padus could be a result of the restricted host range of the s[...]
