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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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A. Telang ; J. Sandstrom ; E. Dyreson ; N. Moran | 1999The feeding behavior of Diuraphis noxia Mordvilko (Homoptera: Aphididae) on susceptible hosts causes both ultrastructural and tissue level damage which may affect phloem composition. Genetic evidence suggests that endosymbiotic bacteria in most [...]
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J. Sandstrom | 1994The performance of one clone of the pea aphid, Acyrthosiphon pisum (Harris), was assessed on 37 different cultivars and species of Pisum L. In addition, random samples of 36 pea aphid clones collected on alfalfa and clover were tested on a selec[...]
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J. Sandstrom ; N. Moran | 1999Aphids harbour intracellular symbionts (Buchnera) that provide their host with amino acids present in low amounts in their diet, phloem sap. To find out the extent to which aphids depend on their symbionts for synthesis of individual essential a[...]
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J. Sandstrom ; A. Telang ; N. Moran | 190Three aphid species were compared with respect to ability of enhancing the nutritional quality of their host plants. Rhopalosiphum padi, which does not induce macroscopic changes in its host plants, was compared with Schizaphis graminum and Diur[...]
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Nutritional quality of phloem sap in relation to host plant-alternation in the bird cherry-oat aphid
J. Sandstrom | 2000Host alternation in aphids has been attributed to complementary growth of host plants, or more specifically to seasonal changes in the nitrogen quality of the phloem sap. In this report, seasonal fluctuation of free amino acids in phloem of the [...]
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J. Sandstrom | 1994The performances of three clones of pea aphids, with different host affiliations, were evaluated on four host plants species and on four artificial diets. The amino acid compositions of the diets mimicked those of the phloem sap of the respectiv[...]
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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. Sandstrom | 19961. Temporal changes in host adaptation were followed in a local population of the pea aphid, Acyrthosiphon pisum. Aphid clones were collected in one alfalfa and one clover field at three different times. In the spring, first-generation females w[...]
