| an entomopathogenic nematode extends its niche by associating with different symbionts. | bacterial symbionts are increasingly recognised as mediators of ecologically important traits of their animal hosts, with acquisition of new traits possible by uptake of novel symbionts. the entomopathogenic nematode heterorhabditis downesi associates with two bacterial symbionts, photorhabdus temperata subsp. temperata and p. temperata subsp. cinerea. at one intensively studied coastal dune site, p. temperata subsp. cinerea is consistently more frequently isolated than p. temperata subsp. tempe ... | 2017 | 27543560 |
| the lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, hylobius abietis (coleoptera: curculionidae). | entomopathogenic nematodes (epn) frequently kill their host within 1-2 days, and interest in epn focuses mainly on their lethality. however, insects may take longer to die, or may fail to die despite being infected, but little is known about the effects of epn infection on insects, other than death. here we investigate both lethal and sub-lethal effects of infection by two epn species, steinernema carpocapsae and heterorhabditis downesi, on adults of the large pine weevil, hylobius abietis. foll ... | 2010 | 20382152 |
| competition and intraguild predation between the braconid parasitoid bracon hylobii and the entomopathogenic nematode heterorhabditis downesi, natural enemies of the large pine weevil, hylobius abietis. | in biological control programmes introduced natural enemies compete with indigenous enemies for hosts and may also engage in intraguild predation when two species competing for the same prey attack and consume one another. the large pine weevil, hylobius abietis l. (coleoptera: curculionidae), is an important pest of coniferous reforestation in europe. among its natural enemies, the parasitoid bracon hylobii ratz. (hymenoptera: braconidae) and entomopathogenic nematodes have potential as biologi ... | 2009 | 19006580 |
| photorhabdus temperata subsp. cinerea subsp. nov., isolated from heterorhabditis nematodes. | during the characterization of symbiotic bacteria of hungarian entomopathogenic nematode isolates, a number of bacteria (including strain 3107(t)) isolated from heterorhabditis downesi and heterorhabditis megidis showed only moderate 16s rrna gene sequence similarity to the type strains of all described photorhabdus species and subspecies. on the basis of the 16s rrna gene sequence, the phylogenetic relationships of these isolates were uncertain, because of the low bootstrap values. using gyrb s ... | 2008 | 18984696 |
| establishment, persistence, and introgression of entomopathogenic nematodes in a forest ecosystem. | entomopathogenic nematodes (epn) are currently marketed worldwide for use in inundative biological control, where the applied natural enemy population (rather than its offspring) is expected to reduce insect numbers. unlike classical biological control, in inundative control natural enemy establishment is not crucial in order to achieve pest suppression. field trials in irish forestry provided the opportunity to test predictions regarding the establishment of two exotic (steinernema carpocapsae ... | 2008 | 18488631 |
| persistence of four heterorhabditis spp. isolates in soil: role of lipid reserves. | infective juveniles of four heterorhabditis isolates (h. bacteriophora hi, h. megidis uk211 and hf85, and h. downesi m245) were stored in moist (pf 1.7) and dry (pf 3.3) loam soil at 20 degrees c for up to 141 days. survival, assessed by the number of nematodes extracted by centrifugal flotation, declined over time, reaching fewer than 18% alive by day 141 for all but one treatment (h. bacteriophora hi in dry soil). the infectivity of nematodes in soil for tenebrio molitor also declined over tim ... | 2002 | 19265925 |