| silver staining as a new banding technique to identify aphid chromosomes. | the karyotype of the aphid aphis sambuci has been studied by means of c-banding, fluorochrome staining and agno3 staining. heterochromatic areas are confined exclusively to the x chromosomes. interestingly, silver staining produces a clear-cut longitudinal differentiation of all chromosomes, which allows reliable identification of homologues. | 1998 | 9510511 |
| individual variation in oviposition preference, and its interaction with larval performance in an insect predator. | individual female episyrphus balteatus (degeer) (diptera: syrphidae) show different oviposition preferences when presented with two aphid prey species, aphis sambuci l. and a. fabae (scop). after larvae were reared on those aphids, some fitness components indicated that individual females were adapted to different host-use strategies, with preference for one aphid prey species entailing a trade-off in poorer performance on another. we interpret the pattern of significant interactions as suggesti ... | 1999 | 28307407 |
| the use of common elder sambucus nigra to promote aphidophagous syrphids in apple orchards. | elder shrubs (sambucus nigra l.) were planted in an experimental apple orchard as bordering hedgerow with the objective of rearing syrphids (diptera: syrphidae) and consequently enhancing the biological control of the rosy apple aphid dysaphis plantaginea (passerini). the inoculative introduction of the specific elder aphid aphis sambuci l. (homoptera: aphididae) in late march 2002 and again in 2003 led to the complete hedgerow turning into an early and productive alternative prey reservoir for ... | 2005 | 16628887 |
| comparison of ecdysteroid concentration in different morphs of aphids. | the amounts of ecdysteroids were determined in different morphs of holocyclic monoecious aphids (acyrthosiphon pisum harris, dysaphis devecta walk., lachnus roboris l., schizolachnus pineti f.) and holocyclic heteroecious aphids (aphis sambuci l., rhopalosiphum padi l.) by means enzyme immunoassay. among the parthenogenetic morphs (fundatrices, virginoparae, and oviparae), the fundatrices have consistently higher amounts of ecdysteroids than those of other morphs of the same species. alate and a ... | 1996 | 9568366 |