| aphid specific predators in potato in belgium. | in summer 2003, aphid specific predators populations were sampled in four potato fields located in wallonia. ladybirds, hoverflies and lacewings were the most abundant predators collected. a total of 6 ladybird, 8 syrphid and 2 lacewing species was found. predator species composition and abundance greatly differed from field to field, while aphids populations were more or less similar with a peak of 3 to 5 aphid/potato leaf in mid-july. all chrysopidae sampled belong to the chrysoperla kolthoffi ... | 2004 | 15759406 |
| functional response of four syrphid predators associated with green apple aphid (hemiptera: aphididae) in laboratory. | aphis pomi de geer, the green apple aphid, is an economic pest of apple and other rosaceae throughout the world. in the present study, functional responses of the syrphids episyrphus balteatus de geer, eristalis tenax(l.), eristalis interruptus (poda), and sphaerophoria scripta (l.), to a. pomi were studied under laboratory conditions to determine their relative predatory potential. the second- and third-instar larvae of the predators were exposed to increasing densities of similar-sized a. pomi ... | 2016 | 26578626 |
| provisioning floral resources to attract aphidophagous hoverflies (diptera: syrphidae) useful for pest management in central spain. | noncrop plant communities present on the boundaries or within crop fields are essential for the maintenance of functional biodiversity, affecting beneficial insect numbers and ecological fitness. habitat manipulation is an increasingly studied strategy aimed at enhancing natural enemies of agricultural pests by providing feeding and shelter resources. in this study, six plant species selected from preliminary work were tested for their potential attractiveness to four common aphidophagous hoverf ... | 2013 | 24498730 |
| migration and dispersal may drive to high genetic variation and significant genetic mixing: the case of two agriculturally important, continental hoverflies (episyrphus balteatus and sphaerophoria scripta). | population structure of pests and beneficial species is an important issue when designing management strategies to optimize ecosystem services. in this study, we investigated for the first time the population structure at a continental scale of two migratory species of hoverflies providing both pest regulation and pollination services [episyrphus balteatus and sphaerophoria scripta (diptera: syrphidae)]. to achieve this objective, we used two sets of 12 species-specific microsatellite markers on ... | 2013 | 24138027 |
| scale effects on the attachment pads and friction forces in syrphid flies (diptera, syrphidae). | to test the role of constructional and dimensional factors in the generation of friction force by systems of setose attachment pads, six species of syrphid fly (platycheirus angustatus, sphaerophoria scripta, episyrphus balteatus, eristalis tenax, myathropa florea and volucella pellucens) were studied using light and scanning electron microscopy. flies were selected according to their various body mass and attachment pad dimensions. such variables as pad area, setal density, the area of a single ... | 2001 | 11273804 |