| honeydew of aphids as a source of sugar for phlebotomus ariasi. | wild-caught phlebotomus ariasi tonnoir, starved until their sugar meals had been digested, were caged for 24 h with plants or plants infested with aphids and then tested for fructose, a constituent of plant sap. no evidence was found that the flies took sap directly from nine types of plants present in their habitat. about two-thirds of flies caged with oak (quercus ilex l.) infested with an aphid [lachnus roboris (l.)] and about a fifth kept with leaves of the french bean (phaseolus vulgaris l. ... | 1987 | 2979545 |
| changes in monoterpene emission rates of quercus ilex infested by aphids tended by native or invasive lasius ant species. | the emission of volatile organic compounds (vocs) depends on temperature and light. other factors such as insect herbivory also may modify voc emission. in particular, aphid feeding promotes the release of new compounds and changes the composition of plant volatile blends. given that some aphids are tended by ants, we investigated whether ants change the emission of vocs indirectly through attendance on aphids. the effect of lachnus roboris aphids and two different tending ant species on terpene ... | 2010 | 20549328 |
| indirect effects of tending ants on holm oak volatiles and acorn quality. | the indirect effect of ants on plants through their mutualim with honeydew-producing insects has been extensively investigated. honeydew-producing insects that are tended by ants impose a cost on plant fitness and health by reducing seed production and/or plant growth. this cost is associated with sap intake and virus transmissions but may be overcompensated by tending ants if they deter or prey hebivorous insects. the balance between cost and benefits depends on the tending ant species. in this ... | 2011 | 21494087 |
| 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 |
| | the amount of prey brought into the nest attains a maximum in may, which in the years of an outbreak of tortrix viridana is not much higher than during the times of latency of this insect, and depends at least partly on weather in summer. the crop volume of foraging ants reaches maxima in spring and late summer, probably depending on the abundance of the main producer of honey-dew, lachnus roboris l. the sugar concentration of crop fluid fluctuates around a mean of 0.25 g/cm3 in summer and decre ... | 1972 | 28311258 |