| screening low fire blight susceptible crataegus species for host suitability to hawthorn leaf-curling aphids (dysaphis spp.). | the group of hawthorn leaf-curling aphids (dysaphis spp.) hosted by the common hawthorn crataegus monogyna jacq. may play an important role in the biological control of the rosy apple aphid, dysaphis plantaginea (passerini), by increasing reproduction opportunities for the indigenous hymenopteran parasitoid ephedrus persicae froggatt. unfortunately, most fruitgrowers hesitate to introduce the common hawthorn in their orchards because they fear fire blight infections which may be transmitted by t ... | 2002 | 12696414 |